Changer un type en un autre en compilation.

Voilà j'ai fini mon système :

Code:

---

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767

//#include "application.h" #include <fstream> #include "odfaeg/Core/fastDelegate.h" #include <functional> #include <iostream> #include <tuple> #include <utility> #include <memory> #include "../include/odfaeg/Core/erreur.h" /** *  \file  fastDelegate.h *  \class IRefVal *  \brief Interface for the warppers to references, values and pointers. *  This class is used store references, pointers and values to pass to the callack's functions. *  \param T : the type of the value to wrap. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template <class T, int I> struct Placeholder { static constexpr int getI() { return I; } void operator=(const T& t) { this->t = t; } T& get() { return t; } static constexpr int i = I; using type = T; T t; }; template <class T> using _1 = Placeholder<T, 1>; template <class T> using _2 = Placeholder<T, 2>; template <typename T> struct is_placeholder { static constexpr bool value = false; }; template <typename T, int I> struct is_placeholder<Placeholder<T, I>> { static constexpr bool value = true; }; template <typename T, int I> struct IRefVal { /**\fn     *  \brief default constructor     */ IRefVal()=default; /**\fn T& get()         *  \brief get the reference of the wrapped type.         *  \return the reference of the wrapped type.         */ virtual Placeholder<T, I>& get() =0; /**\fn std::unique_ptr<IRefVal<T>> clone() const = 0;         *  \brief copy the wrapper.         *  \return the copied wrapper.*/ virtual std::unique_ptr<IRefVal<T, I>> clone() const = 0; /**\fn destructor*/ virtual ~IRefVal(){}   protected: /**\fn IRefVal(const IRefVal&)     *  \brief constructor, pass the reference to wrap.     *  \param const IRefVal& : the reference to wrap.     */ IRefVal(const IRefVal&){} /** \fn IRefVal& operator=(const IRefVal&)         *   \brief affector.         *   \param const IRefVal& : the wrapper to affect.         *   \return the affected wrapper.*/ IRefVal& operator=(const IRefVal&) { return *this; } }; template<class T> struct IRefVal<T, 0> { /**\fn     *  \brief default constructor     */ IRefVal()=default; /**\fn T& get()         *  \brief get the reference of the wrapped type.         *  \return the reference of the wrapped type.         */ virtual T& get() =0; /**\fn std::unique_ptr<IRefVal<T>> clone() const = 0;         *  \brief copy the wrapper.         *  \return the copied wrapper.*/ virtual std::unique_ptr<IRefVal<T, 0>> clone() const = 0; /**\fn destructor*/ virtual ~IRefVal(){}   protected: /**\fn IRefVal(const IRefVal&)     *  \brief constructor, pass the reference to wrap.     *  \param const IRefVal& : the reference to wrap.     */ IRefVal(const IRefVal&){} /** \fn IRefVal& operator=(const IRefVal&)         *   \brief affector.         *   \param const IRefVal& : the wrapper to affect.         *   \return the affected wrapper.*/ IRefVal& operator=(const IRefVal&) { return *this; } }; /** *  \file  fastDelegate.h *  \class Ref *  \brief Warp a reference. (Use std::reference_wrapper so we can pass a reference with std::ref) *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct Ref : IRefVal<T, 0> { /**     *\fn Ref(const std::reference_wrapper<T>& r)     *\brief Constructor : pass an std::reference_wrapper to the wrapper.     *\param std::reference_wrapper<T>& r : the reference_wrapper.     */ Ref(const std::reference_wrapper<T>& r) : ref(r) {} /**         * \fn T& get()         * \brief return a reference to an object.         * \return T& the reference to the object.         */ T& get() { return ref.get(); } /**         * \fn std::unique_ptr<IRefVal<T>> clone() const         * \brief copy the reference wrapper.         * \return std::unique_ptr<IRefVal<T>> : the cloned wrapper.         */ std::unique_ptr<IRefVal<T, 0>> clone() const { return std::make_unique<Ref>(*this); } private: std::reference_wrapper<T> ref; /**> the std::reference_wrapper which warp the reference.*/ }; /** *  \file  fastDelegate.h *  \class Val *  \brief Warp a value. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct Val : IRefVal<T, 0> { /**\fn Val(const T& t)     *  \brief pass a value to the wrapper.     *  \param const T& t : the value to pass.     */ Val(const T& t) : val(t) {} /** \fn         *   \brief return the value         *   \return T& : return the value.         */ T& get() { return val; }   /**         * \fn std::unique_ptr<IRefVal<T>> clone() const         * \brief copy the value wrapper.         * \return std::unique_ptr<IRefVal<T>> : the cloned wrapper.         */ std::unique_ptr<IRefVal<T, 0>> clone() const { return std::make_unique<Val>(*this); } private: T val; /**> T val : keep the value of the wrapper.*/ }; template <class T, int I> struct PlaceholdersWrapper : IRefVal<T, I> { PlaceholdersWrapper (Placeholder<T, I> pl) : pl(pl) {   } Placeholder<T, I>& get() { return pl; } std::unique_ptr<IRefVal<T, I>> clone() const { return std::make_unique<PlaceholdersWrapper<T, I>>(*this); } private : Placeholder<T, I> pl; }; /** *  \file  fastDelegate.h *  \class Ref *  \brief Warp a pointer. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T, int I> struct RefVal { RefVal() = default; RefVal(const Placeholder<T, I>& pl) : rv(std::make_unique<PlaceholdersWrapper<T, I>>(pl)) {} RefVal(const RefVal& rhs) { rv = rhs.rv->clone(); } RefVal& operator=(const RefVal& rhs) { rv=rhs.rv->clone(); return *this; } /** \fn T& get() const         *   \brief get the wrapper.         *   \return a unique pointer to the generic wrapper interface.         */ Placeholder<T, I>& get() const { return rv->get(); } private: std::unique_ptr<IRefVal<T, I>> rv; /**> a pointer to the generic wrapper interface.*/ }; template<class T> struct RefVal<T, 0> { RefVal() = default; /**     * \fn RefVal (const T& t)     * \brief constructor : construct a wrapper to a value     * \param const T& t : the value to     */ RefVal(const T& t) : rv(std::make_unique<Val<T>>(t)) {} /**     * \fn RefVal (const std::reference_wrapper<T>& r)     * \brief constructor : construct a wrapper to an std::reference_wrapper.     * \param const std::reference_wrapper<T>& : the std::reference_wrapper to pass.     */ RefVal(const std::reference_wrapper<T>& r) : rv(std::make_unique<Ref<T>>(r)) {} RefVal(const RefVal& rhs) { rv = rhs.rv->clone(); } RefVal(const RefVal&& rhs) { rv = rhs.rv->clone(); } template <int I> RefVal& operator=(Placeholder<T, I>&& rhs) { *this = RefVal(rhs.get()); return *this; } RefVal& operator=(const RefVal& rhs) { rv=rhs.rv->clone(); return *this; } RefVal& operator=(const RefVal&& rhs) { rv=rhs.rv->clone(); return *this; } T& get() { return rv->get(); } /** \fn T& get() const         *   \brief get the wrapper.         *   \return a unique pointer to the generic wrapper interface.         */ private: std::unique_ptr<IRefVal<T, 0>> rv; /**> a pointer to the generic wrapper interface.*/ }; //Classe de trait pour déterminer le type à stocker   //(Interne) Cas général /** *  \file  fastDelegate.h *  \class ToStoreImpl *  \param T the type of the wrapper. *  \brief Trait class which use an alias on a wrapped type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct ToStoreImpl1 { using type = T; }; /** *  \file  fastDelegate.h *  \class ToStoreImpl *  \param T the type warpped in the warpper. *  \brief Trait class with keep an alias on the wrapped type. *  This class is specialized for std::_reference_wrapper type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct ToStoreImpl1<std::reference_wrapper<T>> { using type = T; }; template<class T, int I> struct ToStoreImpl1<Placeholder<T, I>> { using type = T; };   /** *  \file  fastDelegate.h *  \class ToStore *  \param T the type of the wrapper. *  \brief Trait class with keep an alias of the wrapper type. (without the reference) *  the inheritance use the right specialized templated class to hold the type of the wrapped object *  depending on the wrapper type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct ToStore1 : ToStoreImpl1<std::remove_reference_t<T>> {}; /** *  \file  fastDelegate.h *  \class ToStore_t *  \param T the type of the wrapped object. *  \brief Trait class which hold an alias to the real type of the wrapped type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> using ToStore_f = typename ToStore1<T>::type; //Classe de trait pour déterminer le type à stocker   //(Interne) Cas général /** *  \file  fastDelegate.h *  \class ToStoreImpl *  \param T the type of the wrapper. *  \brief Trait class which use an alias on a wrapped type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct ToStoreImpl2 { using type = T; }; /** *  \file  fastDelegate.h *  \class ToStoreImpl *  \param T the type warpped in the warpper. *  \brief Trait class with keep an alias on the wrapped type. *  This class is specialized for std::_reference_wrapper type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct ToStoreImpl2<std::reference_wrapper<T>> { using type = T; }; template<class T, int I> struct ToStoreImpl2<Placeholder<T, I>> { using type = Placeholder<T, I>; };   /** *  \file  fastDelegate.h *  \class ToStore *  \param T the type of the wrapper. *  \brief Trait class with keep an alias of the wrapper type. (without the reference) *  the inheritance use the right specialized templated class to hold the type of the wrapped object *  depending on the wrapper type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct ToStore2 : ToStoreImpl2<std::remove_reference_t<T>> {}; /** *  \file  fastDelegate.h *  \class ToStore_t *  \param T the type of the wrapped object. *  \brief Trait class which hold an alias to the real type of the wrapped type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> using ToStore_t = typename ToStore2<T>::type; /** *  \file  fastDelegate.h *  \class DynamicWrapper *  \param R the return type of the wrapped functor. *  \param C the class type of the wrapped functor. *  \param ArgT the arguments types of the wrapped functor. *  \brief This class warp a function pointer to a member function. *  I don't use an std::function directly here to keep the class type of the member function pointer *  because if the passed object is polymorphic, I need to apply a dynamic cast *  before calling the member function pointer on the object. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class R, class C, class... ArgT> struct DynamicWrapper { /**\fn DynamicWrapper(R(C::*pf)(ArgT...)) : pfunc(pf)     *  \brief warp a pointer to a member function.     *  \param R(C::*pf)(ArgT...) : the pointer to the member function.     */ DynamicWrapper(R(C::*pf)(ArgT...)) : pfunc(pf){} /**\fn R operator()(O* o, ArgU&&... arg) const         *  \brief call the member function's pointer witht he given object and the given argument         *  apply a dynamic_cast in case of the type of the object and the type of the classe containing the member function         *  are not the same. (If the object is polymoprhic)         *  If the cast fails it means that the object is not polymorphic so it throws an error.         *  \param O* o : the object onwich to call the member function's pointer.         *  \param ArgU&& arg : the arguments of the member function's pointer to call.         */ template<class O, class... ArgU> R operator()(O* o, ArgU&&... arg) const { if(dynamic_cast<C*>(o)) return (dynamic_cast<C*>(o)->*pfunc)(std::forward<ArgU>(arg)...); throw odfaeg::Erreur(0, "Invalid cast : types are nor polymorphic!", 1); } template<class O, class... ArgU> R operator()(O& o, ArgU&&... arg) const { if(dynamic_cast<C&>(o)) return (dynamic_cast<C&>(o).*pfunc)(std::forward<ArgU>(arg)...); throw odfaeg::Erreur(0, "Invalid cast : types are nor polymorphic!", 1); } private: R (C::*pfunc)(ArgT...); /**> a pointer to a member's function.*/ }; /** *  \file  fastDelegate.h *  \class DynamicFunction *  \param F the type of the function. *  \brief Generic class for every functors type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class F> class DynamicFunction; /** *  \file  fastDelegate.h *  \class DynamicFunction *  \param R the return type of the function. *  \param ArgT... the type of the arguments of the function. *  \brief Specialized template class for functors. (inherit from std::function) *  build a functor with the right constructor depending a the pointer's function type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class R, class... ArgT> class DynamicFunction<R(ArgT...)> : std::function<R(ArgT...)> { /**> just an alias to the type of the base class.*/ using Base = std::function<R(ArgT...)>;   public: /**     * \fn DynamicFunction(F&& f)     * \brief pass a functor to the std::function.     * \param F&& f : the functor to pass to the std::function.     */ template<class F> DynamicFunction(F&& f) : Base(std::forward<F>(f)) {} /** \fn DynamicFunction (R (C::*pf)(ArgU...))         *   \brief pass a pointer to a member's function to the DynamicWrapper, and then         *   pass this wrapper to the std::function, so, the std::function call the operator() of the DynamicWrapper class         *   and not the operator() of the std::function class so we can perform the dynamic_cast if necessary.         *   \param R(C::*pf)(ArgU...) : the pointer to the member's function.         *   \         */ template<class C, class... ArgU> DynamicFunction(R(C::*pf)(ArgU...)) : Base(DynamicWrapper<R,C,ArgU...>(pf)) {} /**> just an allias to the operator() of the base class.*/ using Base::operator(); }; /** *  \file  fastDelegate.h *  \class Delegate *  \param R the return type of the function. *  \brief Interface with can hold a delegate to every delegates types. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class R> struct Delegate { /**\fn Delegate()     *  \brief default constructor.     */ Delegate() =default; /**\fn virtual std::unique_ptr<Delegate> clone() const = 0;     *  \brief pure virtual function to redefine in the subclass to copy the delegate.     *  \return std::unique_ptr<Delegate> a pointer to the copied delegate.     */ virtual std::unique_ptr<Delegate> clone() const = 0; /**\fn R operator()() = 0;     *  \brief pure virtual function to redefines to call the std::function of the delegate.     *  \return R : return the value returned by the std::function.     */ virtual R operator()() = 0; /** /fn virtual Delegate()         * \brief destructor         */ virtual ~Delegate(){}   protected: /**     * \fn Delegate (const Delegate&) {}     * \brief copy constructor.     * \param const Delegate& : the delegate to copy.     */ Delegate(const Delegate&){} /**     * \fn Delegate& operator= (const Delegate&) {}     * \brief affector.     * \return Delegate& : return a reference to the current delegate.     */ Delegate& operator=(const Delegate&) { return *this; } }; template <class... ArgT> struct RefValPl { }; template <class ArgH, class... ArgT> struct RefValPl <ArgH, ArgT...>{ template<class... ArgU> RefValPl(ArgU&&... arg) : param(std::forward<ArgU>(arg)...) { std::cout<<"non place holder"<<std::endl; } template <typename... ArgU> void setParams(ArgU&&... args) { param = std::make_tuple(std::forward<ArgU>(args)...); } std::tuple<RefVal<ArgH, 0>, ArgT...> getParams() { return param; } private : std::tuple<RefVal<ArgH, 0>, ArgT...> param; }; template <template <class, int> class P, class T, int I, class... ArgT> struct RefValPl<P<T, I>, ArgT...> { template<class... ArgU> RefValPl(ArgU&&... arg) : placeholders(std::forward<ArgU>(arg)...) { std::cout<<"place holder"<<std::endl; } template <typename... ArgU> void setParams(ArgU&&... args) { std::tuple<ArgU...> tp = std::make_tuple(std::forward<ArgU>(args)...); changeParams(std::make_index_sequence<sizeof...(ArgT)+1>(), tp); } std::tuple<RefVal<typename P<T, I>::type, 0>, ArgT...> getParams() { return param; } private : template <std::size_t... IND, typename... ArgU> void changeParams (std::index_sequence<IND...>, std::tuple<ArgU...> tp) { param = std::make_tuple(std::get<IND>(tp)...); } std::tuple<RefVal<typename P<T, I>::type, P<T, I>::i>, ArgT...> placeholders; std::tuple<RefVal<typename P<T, I>::type, 0>, ArgT...> param; }; template <class ArgH> struct RefValPl<ArgH> { template<class... ArgU> RefValPl(ArgU&&... arg) : param(std::forward<ArgU>(arg)...) { std::cout<<"non place holder"<<std::endl; } template <typename... ArgU> void setParams(ArgU&&... args) { param = std::make_tuple(std::forward<ArgU>(args)...); } std::tuple<RefVal<ArgH, 0>> getParams() { return param; } private : std::tuple<RefVal<ArgH, 0>> param; }; template <template <class, int> class P, class T, int I> struct RefValPl<P<T, I>> { template<class... ArgU> RefValPl(ArgU&&... arg) : placeholders(std::forward<ArgU>(arg)...) { std::cout<<"place holder"<<std::endl; } template <typename... ArgU> void setParams(ArgU&&... args) { std::tuple<ArgU...> tp = std::make_tuple(std::forward<ArgU>(args)...); changeParams(std::make_index_sequence<1>(), tp); } std::tuple<RefVal<typename P<T, I>::type, 0>> getParams() { return param; } private : template <std::size_t... IND, typename... ArgU> void changeParams (std::index_sequence<IND...>, std::tuple<ArgU...> tp) { param = std::make_tuple(std::get<IND>(tp)...); } std::tuple<RefVal<typename P<T, I>::type, P<T, I>::i>> placeholders; std::tuple<RefVal<typename P<T, I>::type, 0>> param; }; /** *  \file  fastDelegate.h *  \class FastDelegateImpl *  \brief Implementation of the delegate's interfaces. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class R, class... ArgT> struct FastDelegateImpl : Delegate<R> , RefValPl<ToStore_t<ArgT>...> { /** \fn FastDelegateImpl(F&& f, ArgU&&... arg)     *   \brief constructor : create the delegate with the functor and the arguments value passed.     */ template<class F, class... ArgU> FastDelegateImpl(F&& f, ArgU&&... arg) : RefValPl<ToStore_t<ArgT>...>(std::forward<ArgU>(arg)...), func(std::forward<F>(f))/*, param(std::forward<ArgU>(arg)...)*/ {} /** \fn std::unique_ptr<Delegate<R>> clone() const     *   \brief make a copy of the delegate.     *   \return the copied delegate.     */ std::unique_ptr<Delegate<R>> clone() const { return std::make_unique<FastDelegateImpl>(*this); } /** \fn R operator()()         *   \brief call the std::function of the delegate.     *   \return the value returned by the std::function.     */ template <typename... ArgU> void setParams(ArgU&&... args) { RefValPl<ToStore_t<ArgT>...>::setParams(std::forward<ArgU>(args)...); } R operator()() { param = RefValPl<ToStore_t<ArgT>...>::getParams(); return call(std::make_index_sequence<sizeof...(ArgT)>()); } /** \fn R operator()()         *   \brief changed the parameter's values of the std::function.     *   \param ArgU&&... args : the values for the parameters to the delegate's function.     */     private: /** \fn R call(std::index_sequence<I...>)         *   \brief pass each elements of the tuple to the std::function and unwarp them.     *   \param std::index_sequence<I...> : a sequence of indexes to get every elements of the tuple.     *   \return the value returned by the std::function.     */ template<std::size_t... I> R call(std::index_sequence<I...>) { return func(std::get<I>(param).get()...); } DynamicFunction<R(ToStore_f<ArgT>&...)> func; /**> a functor whith hold the pointer to a callback function.*/ std::tuple<RefVal<ToStore_f<ArgT>, 0>...> param; /**> the wrapped values of the parameters to pass to the callback's function.*/ }; /** *  \file  fastDelegate.h *  \class FastDelegate *  \brief Class used for the type erasure, *  which allow the user be able to store a set of different callback's functions types with the same return type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class R> struct FastDelegate { /**\fn default constructor     */ FastDelegate() = default; /**\fn FastDelegate (F&& f, Arg&& arf)     *  \param F&& f : the functor to pass.     *  \param Arg&&... arg : arguments to pass to the functor.     */ template<class F, class... Arg> FastDelegate(F&& f, Arg&&... arg) : delegate(std::make_unique <FastDelegateImpl<R, Arg...>> (std::forward<F>(f), std::forward<Arg>(arg)...) ) {}   /**\fn FastDelegate (FastDelegate& rhs)         *  \brief copy constructor.         *  \param FastDelegate& rhs : the delegate to copy.         */ FastDelegate(FastDelegate& rhs) : delegate(rhs.delegate->clone()) {} /**\fn FastDelegate (const FastDelegate& rhs)         *  \brief copy constructor.         *  \param const FastDelegate& rhs : the delegate to copy.         */ FastDelegate(const FastDelegate& rhs) : delegate(rhs.delegate->clone()) {} /**\fn FastDelegate (FastDelegate& rhs)         *  \brief move constructor.         *  \param FastDelegate&& rhs : the delegate to move.         */ FastDelegate(FastDelegate&& rhs) =default; /**\fn FastDelegate& operator= (FastDelegate& rhs)         *  \brief affect the content of the delegate to the delegate.         *  \param const FastDelegate& rhs : the delegate affect.         *  \return FastDelegate& : the affected delegate.         */ FastDelegate& operator=(const FastDelegate& rhs) { return operator=(FastDelegate(rhs)); } /**\fn FastDelegate& operator= (FastDelegate& rhs)         *  \brief affect and move the content of the delegate to the delegate.         *  \param const FastDelegate& rhs : the delegate to move and to affect.         *  \return FastDelegate& : the moved and affected delegate.         */ FastDelegate& operator=(FastDelegate&&) =default; /**\fn R operator()() const;         *  \brief call the std::function of the delegate.         *  \return the value returned by the std::function.         */ R operator()() const { return (*delegate)(); } /**\fn setParams(Arg&&... arg)         *  \brief change the parameter's values of the delegate.         *  \return Arg&&... arg : the values of the parameters of the delegate.         */ template<class... ArgT, class... ArgV> void setParams(ArgV&&... arg) { using DynamicType = FastDelegateImpl<R, ArgT...>*; if (dynamic_cast<DynamicType>(delegate.get())) dynamic_cast<DynamicType>(delegate.get())->setParams(std::forward<ArgV>(arg)...); else throw odfaeg::Erreur(0, "Bad cast : you've passed a pointer to an object of a derived type as functor argument to the constructor,\n" "which is not compatible with an argument of a base type passed to setParams!\n" "Make a static cast from the derived object to the base object type when passing the argument to the constructor.\n" "Exemple : FastDelegate<void> fd(ptrfunc, static_cast<Base*>(new Derived()); Base* b = &derived; fd.setParams(b)", 1); } private: std::unique_ptr<Delegate<R>> delegate; /**> holds the pointer to the generic delegate.*/ }; void f (int i, int j) { std::cout<<"i : "<<i<<" j : "<<j<<std::endl; } void f2 (int i) { std::cout<<"i : "<<i<<std::endl; } int main (int argv, char* argc[]) { FastDelegate<void> fd(&f,0, 1); fd.setParams<int, int>(1, 2); fd(); FastDelegate<void> fdpl(&f, 3, _2<int>()); fdpl.setParams<int, _2<int>>(3, 4); fdpl(); }

---

Par contre j'arrive pas à faire deux std::get imbriqué comme ceci :

Code:

---

1 2	std::get<std::get<P<T, I>::i(placeholders)>(tp);

---

Pourtant, c'est bien une constexpr i .... et il y a bien une version constexpr de std::get..., je comprend pas pourquoi il veut pas compiler.

Oo ça ressemble pas à un système de placeholder l'utilisation que tu en fais. Quel intérêt de mettre un placeholder si tu dois utiliser un setParam avec l'ensemble des paramètres avant de faire l'appel ? Ça sert à rien. L'intérêt des placeholders c'est qu'ils prennent le i-iemme paramètre lors de l'appel (donc de l'opérateur operator()) là où tu as indiqué le placeholder i.

Ton main devrait ressembler à :

Code:

---

1 2 3 4 5

int main (int argv, char* argc[]) { FastDelegate<void> fdpl(&f, 3, _1<int>());; fdpl(4); }

---

Du moins si tu veux que les gens habitués aux placeholders puissent utiliser un minimum ton code.

Un appel à une fonction constexpr n'est pas systématiquement une expression constante, pour ça il faut qu'elle puisse être évaluée à la compilation. Donnes l'erreur (en entier avec toutes les notes) elle contient surement la réponse.

Bah justement le problème c'est que mes 2 tuples n'ont pas le même nombre d'éléments, et je ne sais pas comment faire pour changer les éléments n°i d'un tuple. (Ne changer que les paramètres pour les placeholders quoi....)

Et si tu regardais ce que j'ai proposé comme code ? Etant donné qu'il marche, ça ne me semble pas absurde comme idée ...

J'ai essayé ceci mais ça mène à un crash. :/

Code:

---

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697

/** *  \file  fastDelegate.h *  \class IRefVal *  \brief Interface for the warppers to references, values and pointers. *  This class is used store references, pointers and values to pass to the callack's functions. *  \param T : the type of the value to wrap. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template <class T, int I> struct Placeholder { Placeholder() { } constexpr int getI() { return I; } void operator=(const T& t) { this->t = t; } T& get() { return t; } static const int i = I; using type = T; T t; }; template <class T> using _1 = Placeholder<T, 1>; template <class T> using _2 = Placeholder<T, 2>; template <typename T> struct is_placeholder { static constexpr bool value = false; }; template <typename T, int I> struct is_placeholder<Placeholder<T, I>> { static constexpr bool value = true; }; template <typename T, int I> struct IRefVal { /**\fn     *  \brief default constructor     */ IRefVal()=default; /**\fn T& get()         *  \brief get the reference of the wrapped type.         *  \return the reference of the wrapped type.         */ virtual const Placeholder<T, I>& get() const =0; /**\fn std::unique_ptr<IRefVal<T>> clone() const = 0;         *  \brief copy the wrapper.         *  \return the copied wrapper.*/ virtual std::unique_ptr<IRefVal<T, I>> clone() const = 0; /**\fn destructor*/ virtual ~IRefVal(){} }; template<class T> struct IRefVal<T, 0> { /**\fn     *  \brief default constructor     */ IRefVal()=default; /**\fn T& get()         *  \brief get the reference of the wrapped type.         *  \return the reference of the wrapped type.         */ virtual T& get() =0; /**\fn std::unique_ptr<IRefVal<T>> clone() const = 0;         *  \brief copy the wrapper.         *  \return the copied wrapper.*/ virtual std::unique_ptr<IRefVal<T, 0>> clone() const = 0; /**\fn destructor*/ virtual ~IRefVal(){} }; /** *  \file  fastDelegate.h *  \class Ref *  \brief Warp a reference. (Use std::reference_wrapper so we can pass a reference with std::ref) *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct Ref : IRefVal<T, 0> { /**     *\fn Ref(const std::reference_wrapper<T>& r)     *\brief Constructor : pass an std::reference_wrapper to the wrapper.     *\param std::reference_wrapper<T>& r : the reference_wrapper.     */ Ref(const std::reference_wrapper<T>& r) : ref(r) {} /**         * \fn T& get()         * \brief return a reference to an object.         * \return T& the reference to the object.         */ T& get() { return ref.get(); } /**         * \fn std::unique_ptr<IRefVal<T>> clone() const         * \brief copy the reference wrapper.         * \return std::unique_ptr<IRefVal<T>> : the cloned wrapper.         */ std::unique_ptr<IRefVal<T, 0>> clone() const { return std::make_unique<Ref>(*this); } private: std::reference_wrapper<T> ref; /**> the std::reference_wrapper which warp the reference.*/ }; /** *  \file  fastDelegate.h *  \class Val *  \brief Warp a value. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct Val : IRefVal<T, 0> { /**\fn Val(const T& t)     *  \brief pass a value to the wrapper.     *  \param const T& t : the value to pass.     */ Val(const T& t) : val(t) {} /** \fn         *   \brief return the value         *   \return T& : return the value.         */ T& get() { return val; }   /**         * \fn std::unique_ptr<IRefVal<T>> clone() const         * \brief copy the value wrapper.         * \return std::unique_ptr<IRefVal<T>> : the cloned wrapper.         */ std::unique_ptr<IRefVal<T, 0>> clone() const { return std::make_unique<Val>(*this); } private: T val; /**> T val : keep the value of the wrapper.*/ }; template <class T, int I> struct PlaceholdersWrapper : IRefVal<T, I> { PlaceholdersWrapper (Placeholder<T, I> pl) : pl(pl) {   } const Placeholder<T, I>& get() const { return pl; } std::unique_ptr<IRefVal<T, I>> clone() const { return std::make_unique<PlaceholdersWrapper<T, I>>(*this); } private : Placeholder<T, I> pl; }; /** *  \file  fastDelegate.h *  \class Ref *  \brief Warp a pointer. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T, int I> struct RefVal { RefVal() = default; RefVal(const Placeholder<T, I>& pl) : rv(std::make_unique<PlaceholdersWrapper<T, I>>(pl)) {} RefVal(const RefVal& rhs) { rv = rhs.rv->clone(); } RefVal(const RefVal&& rhs) { rv = rhs.rv->clone(); } RefVal& operator=(const RefVal& rhs) { rv=rhs.rv->clone(); return *this; } /** \fn T& get() const         *   \brief get the wrapper.         *   \return a unique pointer to the generic wrapper interface.         */ const Placeholder<T, I>& get() const { return rv->get(); } private: std::unique_ptr<IRefVal<T, I>> rv; /**> a pointer to the generic wrapper interface.*/ }; template<class T> struct RefVal<T, 0> { RefVal() = default; /**     * \fn RefVal (const T& t)     * \brief constructor : construct a wrapper to a value     * \param const T& t : the value to     */ RefVal(const T& t) : rv(std::make_unique<Val<T>>(t)) {} RefVal(const RefVal& rhs) { rv = rhs.rv->clone(); } RefVal(const RefVal&& rhs) { rv = rhs.rv->clone(); } /**     * \fn RefVal (const std::reference_wrapper<T>& r)     * \brief constructor : construct a wrapper to an std::reference_wrapper.     * \param const std::reference_wrapper<T>& : the std::reference_wrapper to pass.     */ RefVal(const std::reference_wrapper<T>& r) : rv(std::make_unique<Ref<T>>(r)) {} RefVal& operator=(const RefVal& rhs) { rv=rhs.rv->clone(); return *this; } RefVal& operator=(const RefVal&& rhs) { rv=rhs.rv->clone(); return *this; } T& get() { return rv->get(); } /** \fn T& get() const         *   \brief get the wrapper.         *   \return a unique pointer to the generic wrapper interface.         */ private: std::unique_ptr<IRefVal<T, 0>> rv; /**> a pointer to the generic wrapper interface.*/ }; //Classe de trait pour déterminer le type à stocker   //(Interne) Cas général /** *  \file  fastDelegate.h *  \class ToStoreImpl *  \param T the type of the wrapper. *  \brief Trait class which use an alias on a wrapped type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct ToStoreImpl1 { using type = T; }; /** *  \file  fastDelegate.h *  \class ToStoreImpl *  \param T the type warpped in the warpper. *  \brief Trait class with keep an alias on the wrapped type. *  This class is specialized for std::_reference_wrapper type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct ToStoreImpl1<std::reference_wrapper<T>> { using type = T; }; template<class T, int I> struct ToStoreImpl1<Placeholder<T, I>> { using type = T; };   /** *  \file  fastDelegate.h *  \class ToStore *  \param T the type of the wrapper. *  \brief Trait class with keep an alias of the wrapper type. (without the reference) *  the inheritance use the right specialized templated class to hold the type of the wrapped object *  depending on the wrapper type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct ToStore1 : ToStoreImpl1<std::remove_reference_t<T>> {}; /** *  \file  fastDelegate.h *  \class ToStore_t *  \param T the type of the wrapped object. *  \brief Trait class which hold an alias to the real type of the wrapped type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> using ToStore_f = typename ToStore1<T>::type; //Classe de trait pour déterminer le type à stocker   //(Interne) Cas général /** *  \file  fastDelegate.h *  \class ToStoreImpl *  \param T the type of the wrapper. *  \brief Trait class which use an alias on a wrapped type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct ToStoreImpl2 { using type = T; }; /** *  \file  fastDelegate.h *  \class ToStoreImpl *  \param T the type warpped in the warpper. *  \brief Trait class with keep an alias on the wrapped type. *  This class is specialized for std::_reference_wrapper type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct ToStoreImpl2<std::reference_wrapper<T>> { using type = T; }; template<class T, int I> struct ToStoreImpl2<Placeholder<T, I>> { using type = Placeholder<T, I>; };   /** *  \file  fastDelegate.h *  \class ToStore *  \param T the type of the wrapper. *  \brief Trait class with keep an alias of the wrapper type. (without the reference) *  the inheritance use the right specialized templated class to hold the type of the wrapped object *  depending on the wrapper type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct ToStore2 : ToStoreImpl2<std::remove_reference_t<T>> {}; /** *  \file  fastDelegate.h *  \class ToStore_t *  \param T the type of the wrapped object. *  \brief Trait class which hold an alias to the real type of the wrapped type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> using ToStore_t = typename ToStore2<T>::type; /** *  \file  fastDelegate.h *  \class DynamicWrapper *  \param R the return type of the wrapped functor. *  \param C the class type of the wrapped functor. *  \param ArgT the arguments types of the wrapped functor. *  \brief This class warp a function pointer to a member function. *  I don't use an std::function directly here to keep the class type of the member function pointer *  because if the passed object is polymorphic, I need to apply a dynamic cast *  before calling the member function pointer on the object. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class R, class C, class... ArgT> struct DynamicWrapper { /**\fn DynamicWrapper(R(C::*pf)(ArgT...)) : pfunc(pf)     *  \brief warp a pointer to a member function.     *  \param R(C::*pf)(ArgT...) : the pointer to the member function.     */ DynamicWrapper(R(C::*pf)(ArgT...)) : pfunc(pf){} /**\fn R operator()(O* o, ArgU&&... arg) const         *  \brief call the member function's pointer witht he given object and the given argument         *  apply a dynamic_cast in case of the type of the object and the type of the classe containing the member function         *  are not the same. (If the object is polymoprhic)         *  If the cast fails it means that the object is not polymorphic so it throws an error.         *  \param O* o : the object onwich to call the member function's pointer.         *  \param ArgU&& arg : the arguments of the member function's pointer to call.         */ template<class O, class... ArgU> R operator()(O* o, ArgU&&... arg) const { if(dynamic_cast<C*>(o)) return (dynamic_cast<C*>(o)->*pfunc)(std::forward<ArgU>(arg)...); throw odfaeg::Erreur(0, "Invalid cast : types are nor polymorphic!", 1); } template<class O, class... ArgU> R operator()(O& o, ArgU&&... arg) const { if(dynamic_cast<C&>(o)) return (dynamic_cast<C&>(o).*pfunc)(std::forward<ArgU>(arg)...); throw odfaeg::Erreur(0, "Invalid cast : types are nor polymorphic!", 1); } private: R (C::*pfunc)(ArgT...); /**> a pointer to a member's function.*/ }; /** *  \file  fastDelegate.h *  \class DynamicFunction *  \param F the type of the function. *  \brief Generic class for every functors type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class F> class DynamicFunction; /** *  \file  fastDelegate.h *  \class DynamicFunction *  \param R the return type of the function. *  \param ArgT... the type of the arguments of the function. *  \brief Specialized template class for functors. (inherit from std::function) *  build a functor with the right constructor depending a the pointer's function type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class R, class... ArgT> class DynamicFunction<R(ArgT...)> : std::function<R(ArgT...)> { /**> just an alias to the type of the base class.*/ using Base = std::function<R(ArgT...)>;   public: /**     * \fn DynamicFunction(F&& f)     * \brief pass a functor to the std::function.     * \param F&& f : the functor to pass to the std::function.     */ template<class F> DynamicFunction(F&& f) : Base(std::forward<F>(f)) {} /** \fn DynamicFunction (R (C::*pf)(ArgU...))         *   \brief pass a pointer to a member's function to the DynamicWrapper, and then         *   pass this wrapper to the std::function, so, the std::function call the operator() of the DynamicWrapper class         *   and not the operator() of the std::function class so we can perform the dynamic_cast if necessary.         *   \param R(C::*pf)(ArgU...) : the pointer to the member's function.         *   \         */ template<class C, class... ArgU> DynamicFunction(R(C::*pf)(ArgU...)) : Base(DynamicWrapper<R,C,ArgU...>(pf)) {} /**> just an allias to the operator() of the base class.*/ using Base::operator(); }; /** *  \file  fastDelegate.h *  \class Delegate *  \param R the return type of the function. *  \brief Interface with can hold a delegate to every delegates types. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class R> struct Delegate { /**\fn Delegate()     *  \brief default constructor.     */ Delegate() =default; /**\fn virtual std::unique_ptr<Delegate> clone() const = 0;     *  \brief pure virtual function to redefine in the subclass to copy the delegate.     *  \return std::unique_ptr<Delegate> a pointer to the copied delegate.     */ virtual std::unique_ptr<Delegate> clone() const = 0; /**\fn R operator()() = 0;     *  \brief pure virtual function to redefines to call the std::function of the delegate.     *  \return R : return the value returned by the std::function.     */ virtual R operator()() = 0; /** /fn virtual Delegate()         * \brief destructor         */ virtual ~Delegate(){}   protected: /**     * \fn Delegate (const Delegate&) {}     * \brief copy constructor.     * \param const Delegate& : the delegate to copy.     */ Delegate(const Delegate&){} /**     * \fn Delegate& operator= (const Delegate&) {}     * \brief affector.     * \return Delegate& : return a reference to the current delegate.     */ Delegate& operator=(const Delegate&) { return *this; } }; template <class Arg> struct RefValPl { template<class ArgU> RefValPl(ArgU&& arg) { std::cout<<"non place holder"<<std::endl; } template <typename ArgU> void setParams(ArgU&& arg) { param = RefVal<typename std::remove_reference<ArgU>::type, 0>(std::forward<ArgU>(arg)); } template <int I> constexpr int getPlaceHolder() { return I; } RefVal<Arg, 0>& getParams() { return param; } private : RefVal<Arg, 0> param; }; template <template <class, int> class P, class T, int I> struct RefValPl<P<T, I>> { template<class ArgU> RefValPl(ArgU&& arg) : placeholders(std::forward<ArgU>(arg)) { std::cout<<"place holder"<<std::endl; } template <typename ArgU, typename... TP> void setParams(ArgU&& arg, TP...) { param = RefVal<typename std::remove_reference<ArgU>::type, 0>(std::forward<ArgU>(arg)); } RefVal<typename P<T, I>::type, 0>& getParams() { return param; } template <int IND> constexpr int getPlaceHolder() { placeholders.get().getI(); } private : RefVal<typename P<T, I>::type, P<T, I>::i> placeholders; RefVal<typename P<T, I>::type, 0> param; }; /** *  \file  fastDelegate.h *  \class FastDelegateImpl *  \brief Implementation of the delegate's interfaces. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class R, class... ArgT> struct FastDelegateImpl : Delegate<R> { /** \fn FastDelegateImpl(F&& f, ArgU&&... arg)     *   \brief constructor : create the delegate with the functor and the arguments value passed.     */ template<class F, class... ArgU> FastDelegateImpl(F&& f, ArgU&&... arg) : func(std::forward<F>(f)), param(std::forward<ArgU>(arg)...) {} /** \fn std::unique_ptr<Delegate<R>> clone() const     *   \brief make a copy of the delegate.     *   \return the copied delegate.     */ std::unique_ptr<Delegate<R>> clone() const { return std::make_unique<FastDelegateImpl>(*this); } /** \fn R operator()()         *   \brief call the std::function of the delegate.     *   \return the value returned by the std::function.     */ template <typename... ArgU> void setParams(ArgU&&... args) { std::tuple<ArgU...> param = std::make_tuple(std::forward<ArgU>(args)...); changeParams(param); } R operator()() { return call(std::make_index_sequence<sizeof...(ArgT)>()); } /** \fn R operator()()         *   \brief changed the parameter's values of the std::function.     *   \param ArgU&&... args : the values for the parameters to the delegate's function.     */     private: /** \fn R call(std::index_sequence<I...>)         *   \brief pass each elements of the tuple to the std::function and unwarp them.     *   \param std::index_sequence<I...> : a sequence of indexes to get every elements of the tuple.     *   \return the value returned by the std::function.     */ template<std::size_t I = 0, typename... TP> inline typename std::enable_if<I == sizeof...(TP), void>::type changeParams(std::tuple<TP...> param) {   } template<std::size_t I = 0, typename... TP> inline typename std::enable_if<I < sizeof...(TP), void>::type changeParams(std::tuple<TP...> prms) { //constexpr const int i = std::get<I>(param).getPlaceHolder<I>(); std::get<I>(param).setParams(std::forward<decltype(std::get<I>(prms))>(std::get<I>(prms))); changeParams<I+1, TP...>(prms); } template<std::size_t... I> R call(std::index_sequence<I...>) { return func(std::get<I>(param).getParams().get()...); } DynamicFunction<R(ToStore_f<ArgT>&...)> func; /**> a functor whith hold the pointer to a callback function.*/ std::tuple<RefValPl<ToStore_t<ArgT>>...> param;/**> the wrapped values of the parameters to pass to the callback's function.*/ }; /** *  \file  fastDelegate.h *  \class FastDelegate *  \brief Class used for the type erasure, *  which allow the user be able to store a set of different callback's functions types with the same return type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class R> struct FastDelegate { /**\fn default constructor     */ FastDelegate() = default; /**\fn FastDelegate (F&& f, Arg&& arf)     *  \param F&& f : the functor to pass.     *  \param Arg&&... arg : arguments to pass to the functor.     */ template<class F, class... Arg> FastDelegate(F&& f, Arg&&... arg) : delegate(std::make_unique <FastDelegateImpl<R, Arg...>> (std::forward<F>(f), std::forward<Arg>(arg)...) ) {}   /**\fn FastDelegate (FastDelegate& rhs)         *  \brief copy constructor.         *  \param FastDelegate& rhs : the delegate to copy.         */ FastDelegate(FastDelegate& rhs) : delegate(rhs.delegate->clone()) {} /**\fn FastDelegate (const FastDelegate& rhs)         *  \brief copy constructor.         *  \param const FastDelegate& rhs : the delegate to copy.         */ FastDelegate(const FastDelegate& rhs) : delegate(rhs.delegate->clone()) {} /**\fn FastDelegate (FastDelegate& rhs)         *  \brief move constructor.         *  \param FastDelegate&& rhs : the delegate to move.         */ FastDelegate(FastDelegate&& rhs) =default; /**\fn FastDelegate& operator= (FastDelegate& rhs)         *  \brief affect the content of the delegate to the delegate.         *  \param const FastDelegate& rhs : the delegate affect.         *  \return FastDelegate& : the affected delegate.         */ FastDelegate& operator=(const FastDelegate& rhs) { return operator=(FastDelegate(rhs)); } /**\fn FastDelegate& operator= (FastDelegate& rhs)         *  \brief affect and move the content of the delegate to the delegate.         *  \param const FastDelegate& rhs : the delegate to move and to affect.         *  \return FastDelegate& : the moved and affected delegate.         */ FastDelegate& operator=(FastDelegate&&) =default; /**\fn R operator()() const;         *  \brief call the std::function of the delegate.         *  \return the value returned by the std::function.         */ R operator()() const { return (*delegate)(); } /**\fn setParams(Arg&&... arg)         *  \brief change the parameter's values of the delegate.         *  \return Arg&&... arg : the values of the parameters of the delegate.         */ template<class... ArgT, class... ArgV> void setParams(ArgV&&... args) { using DynamicType = FastDelegateImpl<R, ArgT...>*; if (dynamic_cast<DynamicType>(delegate.get())) dynamic_cast<DynamicType>(delegate.get())->setParams(std::forward<ArgV>(args)...); else throw odfaeg::Erreur(0, "Bad cast : you've passed a pointer to an object of a derived type as functor argument to the constructor,\n" "which is not compatible with an argument of a base type passed to setParams!\n" "Make a static cast from the derived object to the base object type when passing the argument to the constructor.\n" "Exemple : FastDelegate<void> fd(ptrfunc, static_cast<Base*>(new Derived()); Base* b = &derived; fd.setParams(b)", 1); } private: std::unique_ptr<Delegate<R>> delegate; /**> holds the pointer to the generic delegate.*/ }; void f (int i, int j) { std::cout<<"i : "<<i<<" j : "<<j<<std::endl; } void f2 (int i) { std::cout<<"i : "<<i<<std::endl; } int main (int argv, char* argc[]) { FastDelegate<void> fd(&f, _1<int>(), 1); fd.setParams<_1<int>, int>(2); fd(); return 0;

---

Toujours obligé de passer les 2 paramètres...

Ton code ne gère pas l'ordre des placeholders il me semble, moi je voudrais juste retourner une constexpr sur le numéro du placeholder pour récupérer la bonne position dans le tuple, mais, je sais pas comment faire pour récupérer cette constexpr. :/

Qu’appels-tu l'ordre des placeholder ?

Quelque chose comme ceci :

Code:

---

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701

#include "application.h" #include <fstream> #include "odfaeg/Core/fastDelegate.h" #include <functional> #include <iostream> #include <tuple> #include <utility> #include <memory> #include "../include/odfaeg/Core/erreur.h" /** *  \file  fastDelegate.h *  \class IRefVal *  \brief Interface for the warppers to references, values and pointers. *  This class is used store references, pointers and values to pass to the callack's functions. *  \param T : the type of the value to wrap. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template <class T, std::size_t I> struct Placeholder { static const std::size_t i = I; using type = T; }; template <class T> using _1 = Placeholder<T, 1>; template <class T> using _2 = Placeholder<T, 2>; template <typename T> struct is_placeholder { static constexpr bool value = false; }; template <typename T, std::size_t I> struct is_placeholder<Placeholder<T, I>> { static constexpr bool value = true; }; template <typename T, std::size_t I> struct IRefVal { /**\fn     *  \brief default constructor     */ IRefVal()=default; /**\fn T& get()         *  \brief get the reference of the wrapped type.         *  \return the reference of the wrapped type.         */ virtual const Placeholder<T, I>& get() const =0; /**\fn std::unique_ptr<IRefVal<T>> clone() const = 0;         *  \brief copy the wrapper.         *  \return the copied wrapper.*/ virtual std::unique_ptr<IRefVal<T, I>> clone() const = 0; /**\fn destructor*/ virtual ~IRefVal(){} }; template<class T> struct IRefVal<T, 0> { /**\fn     *  \brief default constructor     */ IRefVal()=default; /**\fn T& get()         *  \brief get the reference of the wrapped type.         *  \return the reference of the wrapped type.         */ virtual T& get() =0; /**\fn std::unique_ptr<IRefVal<T>> clone() const = 0;         *  \brief copy the wrapper.         *  \return the copied wrapper.*/ virtual std::unique_ptr<IRefVal<T, 0>> clone() const = 0; /**\fn destructor*/ virtual ~IRefVal(){} }; /** *  \file  fastDelegate.h *  \class Ref *  \brief Warp a reference. (Use std::reference_wrapper so we can pass a reference with std::ref) *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct Ref : IRefVal<T, 0> { /**     *\fn Ref(const std::reference_wrapper<T>& r)     *\brief Constructor : pass an std::reference_wrapper to the wrapper.     *\param std::reference_wrapper<T>& r : the reference_wrapper.     */ Ref(const std::reference_wrapper<T>& r) : ref(r) {} /**         * \fn T& get()         * \brief return a reference to an object.         * \return T& the reference to the object.         */ T& get() { return ref.get(); } /**         * \fn std::unique_ptr<IRefVal<T>> clone() const         * \brief copy the reference wrapper.         * \return std::unique_ptr<IRefVal<T>> : the cloned wrapper.         */ std::unique_ptr<IRefVal<T, 0>> clone() const { return std::make_unique<Ref>(*this); } private: std::reference_wrapper<T> ref; /**> the std::reference_wrapper which warp the reference.*/ }; /** *  \file  fastDelegate.h *  \class Val *  \brief Warp a value. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct Val : IRefVal<T, 0> { /**\fn Val(const T& t)     *  \brief pass a value to the wrapper.     *  \param const T& t : the value to pass.     */ Val(const T& t) : val(t) {} /** \fn         *   \brief return the value         *   \return T& : return the value.         */ T& get() { return val; }   /**         * \fn std::unique_ptr<IRefVal<T>> clone() const         * \brief copy the value wrapper.         * \return std::unique_ptr<IRefVal<T>> : the cloned wrapper.         */ std::unique_ptr<IRefVal<T, 0>> clone() const { return std::make_unique<Val>(*this); } private: T val; /**> T val : keep the value of the wrapper.*/ }; template <class T, int I> struct PlaceholdersWrapper : IRefVal<T, I> { PlaceholdersWrapper (Placeholder<T, I> pl) : pl(pl) {   } const Placeholder<T, I>& get() const { return pl; } std::unique_ptr<IRefVal<T, I>> clone() const { return std::make_unique<PlaceholdersWrapper<T, I>>(*this); } private : Placeholder<T, I> pl; }; /** *  \file  fastDelegate.h *  \class Ref *  \brief Warp a pointer. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T, std::size_t I> struct RefVal { RefVal() = default; RefVal(const Placeholder<T, I>& pl) : rv(std::make_unique<PlaceholdersWrapper<T, I>>(pl)) {} RefVal(const RefVal& rhs) { rv = rhs.rv->clone(); } RefVal(const RefVal&& rhs) { rv = rhs.rv->clone(); } RefVal& operator=(const RefVal& rhs) { rv=rhs.rv->clone(); return *this; } /** \fn T& get() const         *   \brief get the wrapper.         *   \return a unique pointer to the generic wrapper interface.         */ const Placeholder<T, I>& get() const { return rv->get(); } private: std::unique_ptr<IRefVal<T, I>> rv; /**> a pointer to the generic wrapper interface.*/ }; template<class T> struct RefVal<T, 0> { RefVal() = default; /**     * \fn RefVal (const T& t)     * \brief constructor : construct a wrapper to a value     * \param const T& t : the value to     */ RefVal(const T& t) : rv(std::make_unique<Val<T>>(t)) {} RefVal(const RefVal& rhs) { rv = rhs.rv->clone(); } RefVal(const RefVal&& rhs) { rv = rhs.rv->clone(); } /**     * \fn RefVal (const std::reference_wrapper<T>& r)     * \brief constructor : construct a wrapper to an std::reference_wrapper.     * \param const std::reference_wrapper<T>& : the std::reference_wrapper to pass.     */ RefVal(const std::reference_wrapper<T>& r) : rv(std::make_unique<Ref<T>>(r)) {} RefVal& operator=(const RefVal& rhs) { rv=rhs.rv->clone(); return *this; } RefVal& operator=(const RefVal&& rhs) { rv=rhs.rv->clone(); return *this; } T& get() { return rv->get(); } /** \fn T& get() const         *   \brief get the wrapper.         *   \return a unique pointer to the generic wrapper interface.         */ private: std::unique_ptr<IRefVal<T, 0>> rv; /**> a pointer to the generic wrapper interface.*/ }; //Classe de trait pour déterminer le type à stocker   //(Interne) Cas général /** *  \file  fastDelegate.h *  \class ToStoreImpl *  \param T the type of the wrapper. *  \brief Trait class which use an alias on a wrapped type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct ToStoreImpl1 { using type = T; }; /** *  \file  fastDelegate.h *  \class ToStoreImpl *  \param T the type warpped in the warpper. *  \brief Trait class with keep an alias on the wrapped type. *  This class is specialized for std::_reference_wrapper type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct ToStoreImpl1<std::reference_wrapper<T>> { using type = T; }; template<class T, std::size_t I> struct ToStoreImpl1<Placeholder<T, I>> { using type = T; };   /** *  \file  fastDelegate.h *  \class ToStore *  \param T the type of the wrapper. *  \brief Trait class with keep an alias of the wrapper type. (without the reference) *  the inheritance use the right specialized templated class to hold the type of the wrapped object *  depending on the wrapper type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct ToStore1 : ToStoreImpl1<std::remove_reference_t<T>> {}; /** *  \file  fastDelegate.h *  \class ToStore_t *  \param T the type of the wrapped object. *  \brief Trait class which hold an alias to the real type of the wrapped type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> using ToStore_f = typename ToStore1<T>::type; //Classe de trait pour déterminer le type à stocker   //(Interne) Cas général /** *  \file  fastDelegate.h *  \class ToStoreImpl *  \param T the type of the wrapper. *  \brief Trait class which use an alias on a wrapped type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct ToStoreImpl2 { using type = T; }; /** *  \file  fastDelegate.h *  \class ToStoreImpl *  \param T the type warpped in the warpper. *  \brief Trait class with keep an alias on the wrapped type. *  This class is specialized for std::_reference_wrapper type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct ToStoreImpl2<std::reference_wrapper<T>> { using type = T; }; template<class T, std::size_t I> struct ToStoreImpl2<Placeholder<T, I>> { using type = Placeholder<T, I>; };   /** *  \file  fastDelegate.h *  \class ToStore *  \param T the type of the wrapper. *  \brief Trait class with keep an alias of the wrapper type. (without the reference) *  the inheritance use the right specialized templated class to hold the type of the wrapped object *  depending on the wrapper type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> struct ToStore2 : ToStoreImpl2<std::remove_reference_t<T>> {}; /** *  \file  fastDelegate.h *  \class ToStore_t *  \param T the type of the wrapped object. *  \brief Trait class which hold an alias to the real type of the wrapped type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class T> using ToStore_t = typename ToStore2<T>::type; /** *  \file  fastDelegate.h *  \class DynamicWrapper *  \param R the return type of the wrapped functor. *  \param C the class type of the wrapped functor. *  \param ArgT the arguments types of the wrapped functor. *  \brief This class warp a function pointer to a member function. *  I don't use an std::function directly here to keep the class type of the member function pointer *  because if the passed object is polymorphic, I need to apply a dynamic cast *  before calling the member function pointer on the object. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class R, class C, class... ArgT> struct DynamicWrapper { /**\fn DynamicWrapper(R(C::*pf)(ArgT...)) : pfunc(pf)     *  \brief warp a pointer to a member function.     *  \param R(C::*pf)(ArgT...) : the pointer to the member function.     */ DynamicWrapper(R(C::*pf)(ArgT...)) : pfunc(pf){} /**\fn R operator()(O* o, ArgU&&... arg) const         *  \brief call the member function's pointer witht he given object and the given argument         *  apply a dynamic_cast in case of the type of the object and the type of the classe containing the member function         *  are not the same. (If the object is polymoprhic)         *  If the cast fails it means that the object is not polymorphic so it throws an error.         *  \param O* o : the object onwich to call the member function's pointer.         *  \param ArgU&& arg : the arguments of the member function's pointer to call.         */ template<class O, class... ArgU> R operator()(O* o, ArgU&&... arg) const { if(dynamic_cast<C*>(o)) return (dynamic_cast<C*>(o)->*pfunc)(std::forward<ArgU>(arg)...); throw odfaeg::Erreur(0, "Invalid cast : types are nor polymorphic!", 1); } template<class O, class... ArgU> R operator()(O& o, ArgU&&... arg) const { if(dynamic_cast<C&>(o)) return (dynamic_cast<C&>(o).*pfunc)(std::forward<ArgU>(arg)...); throw odfaeg::Erreur(0, "Invalid cast : types are nor polymorphic!", 1); } private: R (C::*pfunc)(ArgT...); /**> a pointer to a member's function.*/ }; /** *  \file  fastDelegate.h *  \class DynamicFunction *  \param F the type of the function. *  \brief Generic class for every functors type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class F> class DynamicFunction; /** *  \file  fastDelegate.h *  \class DynamicFunction *  \param R the return type of the function. *  \param ArgT... the type of the arguments of the function. *  \brief Specialized template class for functors. (inherit from std::function) *  build a functor with the right constructor depending a the pointer's function type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class R, class... ArgT> class DynamicFunction<R(ArgT...)> : std::function<R(ArgT...)> { /**> just an alias to the type of the base class.*/ using Base = std::function<R(ArgT...)>;   public: /**     * \fn DynamicFunction(F&& f)     * \brief pass a functor to the std::function.     * \param F&& f : the functor to pass to the std::function.     */ template<class F> DynamicFunction(F&& f) : Base(std::forward<F>(f)) {} /** \fn DynamicFunction (R (C::*pf)(ArgU...))         *   \brief pass a pointer to a member's function to the DynamicWrapper, and then         *   pass this wrapper to the std::function, so, the std::function call the operator() of the DynamicWrapper class         *   and not the operator() of the std::function class so we can perform the dynamic_cast if necessary.         *   \param R(C::*pf)(ArgU...) : the pointer to the member's function.         *   \         */ template<class C, class... ArgU> DynamicFunction(R(C::*pf)(ArgU...)) : Base(DynamicWrapper<R,C,ArgU...>(pf)) {} /**> just an allias to the operator() of the base class.*/ using Base::operator(); }; /** *  \file  fastDelegate.h *  \class Delegate *  \param R the return type of the function. *  \brief Interface with can hold a delegate to every delegates types. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class R> struct Delegate { /**\fn Delegate()     *  \brief default constructor.     */ Delegate() =default; /**\fn virtual std::unique_ptr<Delegate> clone() const = 0;     *  \brief pure virtual function to redefine in the subclass to copy the delegate.     *  \return std::unique_ptr<Delegate> a pointer to the copied delegate.     */ virtual std::unique_ptr<Delegate> clone() const = 0; /**\fn R operator()() = 0;     *  \brief pure virtual function to redefines to call the std::function of the delegate.     *  \return R : return the value returned by the std::function.     */ virtual R operator()() = 0; /** /fn virtual Delegate()         * \brief destructor         */ virtual ~Delegate(){}   protected: /**     * \fn Delegate (const Delegate&) {}     * \brief copy constructor.     * \param const Delegate& : the delegate to copy.     */ Delegate(const Delegate&){} /**     * \fn Delegate& operator= (const Delegate&) {}     * \brief affector.     * \return Delegate& : return a reference to the current delegate.     */ Delegate& operator=(const Delegate&) { return *this; } }; template <class Arg> struct RefValPl { using type = Arg; template<class ArgU> RefValPl(ArgU&& arg) : param (std::forward<ArgU>(arg)) { std::cout<<"non place holder"<<std::endl; } template <typename ArgU> void setParams(ArgU&& arg) { param = RefVal<ToStore_f<ArgU>, 0>(std::forward<ArgU>(arg)); } template <std::size_t I> constexpr std::size_t getPosition() { return I; } RefVal<Arg, 0>& getParams() { return param; } private : RefVal<Arg, 0> param;   }; template <template <class, std::size_t> class P, class T, std::size_t I> struct RefValPl<P<T, I>> { template<class ArgU> RefValPl(ArgU&& arg) : placeholders(std::forward<ArgU>(arg)) { std::cout<<"place holder"<<std::endl; } template <typename ArgU> void setParams(ArgU&& arg) { param = RefVal<typename P<T, I>::type, 0>(std::forward<ArgU>(arg)); } RefVal<typename P<T, I>::type, 0>& getParams() { return param; } template <std::size_t IND> inline constexpr std::size_t getPosition() { P<T, I>::i; } constexpr T getType() { return P<T, I>::type; } private : RefVal<typename P<T, I>::type, P<T, I>::i> placeholders; RefVal<typename P<T, I>::type, 0> param; }; /** *  \file  fastDelegate.h *  \class FastDelegateImpl *  \brief Implementation of the delegate's interfaces. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class R, class... ArgT> struct FastDelegateImpl : Delegate<R> { /** \fn FastDelegateImpl(F&& f, ArgU&&... arg)     *   \brief constructor : create the delegate with the functor and the arguments value passed.     */ template<class F, class... ArgU> FastDelegateImpl(F&& f, ArgU&&... arg) : func(std::forward<F>(f)), param(std::forward<ArgU>(arg)...) {} /** \fn std::unique_ptr<Delegate<R>> clone() const     *   \brief make a copy of the delegate.     *   \return the copied delegate.     */ std::unique_ptr<Delegate<R>> clone() const { return std::make_unique<FastDelegateImpl>(*this); } /** \fn R operator()()         *   \brief call the std::function of the delegate.     *   \return the value returned by the std::function.     */ template <typename... ArgU> void setParams(ArgU&&... args) { std::tuple<ArgU...> param = std::make_tuple(std::forward<ArgU>(args)...); changeParams(param); } R operator()() { return call(std::make_index_sequence<sizeof...(ArgT)>()); } /** \fn R operator()()         *   \brief changed the parameter's values of the std::function.     *   \param ArgU&&... args : the values for the parameters to the delegate's function.     */     private: /** \fn R call(std::index_sequence<I...>)         *   \brief pass each elements of the tuple to the std::function and unwarp them.     *   \param std::index_sequence<I...> : a sequence of indexes to get every elements of the tuple.     *   \return the value returned by the std::function.     */ template<std::size_t I = 0, typename... TP> inline typename std::enable_if<I == sizeof...(TP), void>::type changeParams(std::tuple<TP...> param) {   } template<std::size_t I = 0, typename... TP> inline typename std::enable_if<I < sizeof...(TP), void>::type constexpr changeParams(std::tuple<TP...> prms) { std::get<I>(param).setParams( std::forward<decltype(std::get<std::get<I>(param).getPosition<I>()>(prms))> (std::get<std::get<I>(param).getPosition<I>()>(prms))); changeParams<I+1, TP...>(prms); } template<std::size_t... I> R call(std::index_sequence<I...>) { return func(std::get<I>(param).getParams().get()...); } DynamicFunction<R(ToStore_f<ArgT>&...)> func; /**> a functor whith hold the pointer to a callback function.*/ std::tuple<RefValPl<ToStore_t<ArgT>>...> param;/**> the wrapped values of the parameters to pass to the callback's function.*/ }; /** *  \file  fastDelegate.h *  \class FastDelegate *  \brief Class used for the type erasure, *  which allow the user be able to store a set of different callback's functions types with the same return type. *  \author Duroisin.L *  \version 1.0 *  \date 1/02/2014 */ template<class R> struct FastDelegate { /**\fn default constructor     */ FastDelegate() = default; /**\fn FastDelegate (F&& f, Arg&& arf)     *  \param F&& f : the functor to pass.     *  \param Arg&&... arg : arguments to pass to the functor.     */ template<class F, class... Arg> FastDelegate(F&& f, Arg&&... arg) : delegate(std::make_unique <FastDelegateImpl<R, Arg...>> (std::forward<F>(f), std::forward<Arg>(arg)...) ) {}   /**\fn FastDelegate (FastDelegate& rhs)         *  \brief copy constructor.         *  \param FastDelegate& rhs : the delegate to copy.         */ FastDelegate(FastDelegate& rhs) : delegate(rhs.delegate->clone()) {} /**\fn FastDelegate (const FastDelegate& rhs)         *  \brief copy constructor.         *  \param const FastDelegate& rhs : the delegate to copy.         */ FastDelegate(const FastDelegate& rhs) : delegate(rhs.delegate->clone()) {} /**\fn FastDelegate (FastDelegate& rhs)         *  \brief move constructor.         *  \param FastDelegate&& rhs : the delegate to move.         */ FastDelegate(FastDelegate&& rhs) =default; /**\fn FastDelegate& operator= (FastDelegate& rhs)         *  \brief affect the content of the delegate to the delegate.         *  \param const FastDelegate& rhs : the delegate affect.         *  \return FastDelegate& : the affected delegate.         */ FastDelegate& operator=(const FastDelegate& rhs) { return operator=(FastDelegate(rhs)); } /**\fn FastDelegate& operator= (FastDelegate& rhs)         *  \brief affect and move the content of the delegate to the delegate.         *  \param const FastDelegate& rhs : the delegate to move and to affect.         *  \return FastDelegate& : the moved and affected delegate.         */ FastDelegate& operator=(FastDelegate&&) =default; /**\fn R operator()() const;         *  \brief call the std::function of the delegate.         *  \return the value returned by the std::function.         */ R operator()() const { return (*delegate)(); } /**\fn setParams(Arg&&... arg)         *  \brief change the parameter's values of the delegate.         *  \return Arg&&... arg : the values of the parameters of the delegate.         */ template<class... ArgT, class... ArgV> void setParams(ArgV&&... args) { using DynamicType = FastDelegateImpl<R, ArgT...>*; if (dynamic_cast<DynamicType>(delegate.get())) dynamic_cast<DynamicType>(delegate.get())->setParams(std::forward<ArgV>(args)...); else throw odfaeg::Erreur(0, "Bad cast : you've passed a pointer to an object of a derived type as functor argument to the constructor,\n" "which is not compatible with an argument of a base type passed to setParams!\n" "Make a static cast from the derived object to the base object type when passing the argument to the constructor.\n" "Exemple : FastDelegate<void> fd(ptrfunc, static_cast<Base*>(new Derived()); Base* b = &derived; fd.setParams(b)", 1); } private: std::unique_ptr<Delegate<R>> delegate; /**> holds the pointer to the generic delegate.*/ }; void f (int i, int j) { std::cout<<"i : "<<i<<" j : "<<j<<std::endl; } void f2 (int i) { std::cout<<"i : "<<i<<std::endl; } int main (int argv, char* argc[]) { FastDelegate<void> fd(&f, _1<int>(), 1); fd.setParams<_1<int>, int>(2); fd(); }

---

J'ai résolu le problème du crash par contre dès que je veux récupérer la constexpr j'ai une erreur à cette ligne :

Code:

---

1 2 3

std::forward<decltype(std::get<std::get<I>(param).getPosition<I>()>(prms))> (std::get<std::get<I>(param).getPosition<I>()>(prms)));

---

Code:

---

1 2 3 4 5 6 7 8 9 10 11

||=== Build: Debug in ODFAEG-DEMO (compiler: GNU GCC Compiler) ===| /home/laurent/Développement/Projets-c++/ODFAEG-DEMO/main.cpp||In member function ‘constexpr std::size_t RefValPl<P<T, I> >::getPosition() const’:| /home/laurent/Développement/Projets-c++/ODFAEG-DEMO/main.cpp|530|warning: no return statement in function returning non-void [-Wreturn-type]| /home/laurent/Développement/Projets-c++/ODFAEG-DEMO/main.cpp||In instantiation of ‘constexpr typename std::enable_if<(I < sizeof... (TP)), void>::type FastDelegateImpl<R, ArgT>::changeParams(std::tuple<_Args2 ...>) const [with long unsigned int I = 0ul; TP = {int}; R = void; ArgT = {Placeholder<int, 1ul>, int}; typename std::enable_if<(I < sizeof... (TP)), void>::type = void]’:| /home/laurent/Développement/Projets-c++/ODFAEG-DEMO/main.cpp|569|required from ‘void FastDelegateImpl<R, ArgT>::setParams(ArgU&& ...) [with ArgU = {int}; R = void; ArgT = {Placeholder<int, 1ul>, int}]’| /home/laurent/Développement/Projets-c++/ODFAEG-DEMO/main.cpp|680|required from ‘void FastDelegate<R>::setParams(ArgV&& ...) [with ArgT = {Placeholder<int, 1ul>, int}; ArgV = {int}; R = void]’| /home/laurent/Développement/Projets-c++/ODFAEG-DEMO/main.cpp|698|required from here| /home/laurent/Développement/Projets-c++/ODFAEG-DEMO/main.cpp|596|error: invalid operands of types ‘<unresolved overloaded function type>’ and ‘long unsigned int’ to binary ‘operator<’| /home/laurent/Développement/Projets-c++/ODFAEG-DEMO/main.cpp|597|error: invalid operands of types ‘<unresolved overloaded function type>’ and ‘long unsigned int’ to binary ‘operator<’| ||=== Build failed: 2 error(s), 5 warning(s) (0 minute(s), 5 second(s)) ===|

---

Par exemple si j'ai deux placeholders _1<int> ça va passer deux fois la valeur de l'élément 0 du tuple que je passe à setParams et la remplacer partout là ou j'ai le type _1<int>() dans le 1er tuple, pareil pour _2<int>, etc...

Bref std::bind permet de faire cela.

Ce que je te propose est l'unique solution à ton problème.

La problématique est de rendre fonctionnel :

Code:

---

1 2 3

odfaeg::delegate<void> func(foo,odfaeg::ph<0,int>()); func(1);

---

Remontons la pile d'appel pour voir ce qu'il faut modifier :

Code:

---

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

struct delegate { template<class F, class... Arg> delegate(F&& f, Arg&&... arg) : data(std::make_unique<delegate_impl< R,to_store_t<Arg>... >> (std::forward<F>(f),std::forward<Arg>(arg)...) ) {}   template<class... Arg> R operator()() const { return (*data)(); } };

---

L'appel au constructeur est toujours bon si la classe de trait l'est, il faut donc l'adapter à notre type :

Code:

---

1 2 3 4

template<size_t I, class T> struct to_store_impl<ph<I,T>> { using type = T; };

---

L'opérateur d'appel n'est pas bon, modifions le :

Code:

---

1 2 3 4 5 6

struct delegate { template<class... Arg> R operator()(Arg&&... arg) const { return (*data)(); } };

---

Cette fois l'appel est bon, il reste à savoir comment modifier l'implémentation, mais pour ça il faut encore remonter la pile :

Code:

---

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

struct delegate_impl : delegate_i<R> { template<class F, class... ArgU> delegate_impl(F&& f, ArgU&&... arg) : func(std::forward<F>(f)) , param(std::forward<ArgU>(arg)...) {}   R operator()() const { return call(std::make_index_sequence<sizeof...(ArgT)>()); }   private: template<std::size_t... I> R call(std::index_sequence<I...>) const { return func( std::get<I>(param) .get()... ); } };

---

Le constructeur est bon, par contre l'opérateur d'appel toujours pas, et il est cette fois impossible de le template (fonction virtuelle). On a donc besoin d'un type qui peut convenir pour n'importe quoi : void*. D'où :

Code:

---

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

#define FUN_PARAM void* p0 =nullptr, void* p1 =nullptr, void* p2 =nullptr, void* p3 =nullptr #define FWD_PARAM p0,p1,p2,p3   struct delegate_impl : delegate_i<R> { R operator()(FUN_PARAM) const { return call(std::make_index_sequence<sizeof...(ArgT)>(),FWD_PARAM); }   private: template<std::size_t... I, class... ArgU> R call(std::index_sequence<I...>, ArgU&&... arg) const { return func( std::get<I>(param) .get(std::forward<ArgU>(arg)...)... ); } };

---

La limitation est donc le nombre de paramètre mis en place dans la macro. On fait bien entendu suivre l'ensemble à la fonction interne call (qui peut cette fois utiliser un paramètre template variadique) puis à get. On peut donc écrire l'implémentation du premier opérateur d'appel :

Code:

---

1 2 3 4 5 6

struct delegate { template<class... Arg> R operator()(Arg&&... arg) const { return (*data)(&arg...); } };

---

On continue ensuite de remonter la pile d'appel, get est modifié pour supporter plusieurs paramètres dans le code existant, avec un paramètre template variadique et la macro FUN_PARAM. Il ne manque qu'un élément, le placeholder. Il peut être stocké dans le type utilisé dans notre tuple, il doit donc hériter de ref_val_i :

Code:

---

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

template<size_t I, class T> struct ph : ref_val_i<T> { std::unique_ptr<ref_val_i<T>> clone() const { return std::make_unique<ph>(*this); }   T& get(FUN_PARAM) { return *static_cast<T*> (std::get<I>(std::make_tuple(FWD_PARAM))); } };   struct ref_val { template<size_t I> ref_val(ph<I,T>&&) : rv(std::make_unique<ph<I,T>>()) {}   template<class... Arg> T& get(Arg&&... arg) const { return rv->get(std::forward<Arg>(arg)...); } };

---

Tu as ici le raisonnement complet qui conduit à cette implémentation, et il n'y a pas de décision alternative possible dans le raisonnement.

Pour ton erreur, il doit te manquer un template ici : std::get<I>(param).template getPosition<I>()