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#ifndef ODFAEG_FAST_DELEGATE_HPP
#define ODFAEG_FAST_DELEGATE_HPP
#include <functional>
#include <iostream>
#include "export.hpp"
#include "erreur.h"
#include <tuple>
#include <utility>
#include <memory>
/**
*\namespace odfaeg
* the namespace of the Opensource Development Framework Adapted for Every Games.
*/
namespace odfaeg {
/**
* \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>
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 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>> 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> {
/**
*\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>> 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> {
/**\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>> clone() const
{ return std::make_unique<Val>(*this); }
private:
T val; /**> T val : keep the value of the wrapper.*/
};
/**
* \file fastDelegate.h
* \class Ref
* \brief Warp a pointer.
* \author Duroisin.L
* \version 1.0
* \date 1/02/2014
*/
template<class T>
struct Pointer : IRefVal<T> {
/**\fn Pointer(const T* t)
* \brief pass a pointer to the wrapper.
* \param const T* t : the pointer to pass.
*/
Pointer(const T* t)
: pointer(t)
{}
/** \fn
* \brief return the pointer of the wrapper.
* \return T& : return the pointer.
*/
T& get()
{ return pointer; }
/**
* \fn std::unique_ptr<IRefVal<T>> clone() const
* \brief copy the pointer wrapper.
* \return std::unique_ptr<IRefVal<T>> : the cloned wrapper.
*/
std::unique_ptr<IRefVal<T>> clone() const
{ return std::make_unique<Pointer<T>>(*this); }
private:
T pointer; /**> T pointer : keep the pointer of the wrapper.*/
};
/**
* \file fastDelegate.h
* \class RefVal
* \brief Wrap a pointer, a value or a reference and keep a pointer to the generic wrapper.
* Call the right constructor depending on the wrapper's or value's type.
* \author Duroisin.L
* \version 1.0
* \date 1/02/2014
*/
template<class T>
struct RefVal {
/**
* \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))
{}
/**
* \fn RefVal (const std::reference_wrapper<T>& r)
* \brief constructor : construct a wrapper to a pointer.
* \param const T*& p : the pointer to pass.
*/
RefVal(const T*& p)
: rv(std::make_unique<Pointer<T>>(p))
{}
/** \fn RefVal (const RefVal& rhs)
* \brief copy constructor, copy the wrapper with the right wrapper type.
* \param const RefVal& rhs : the wrapper to copy.
*/
RefVal(const RefVal& rhs)
{
rv = rhs.rv->clone();
}
/** \fn RefVal& operator= (const RefVal& rhs)
* \brief affector.
* \param const RefVal& rhs : the wrapper to affect.
*/
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.
*/
T& get() const
{ return rv->get(); }
private:
std::unique_ptr<IRefVal<T>> 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 ToStoreImpl
{ 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 ToStoreImpl<std::reference_wrapper<T>>
{ 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 ToStore
: ToStoreImpl<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
ToStore<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 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 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;
}
};
/**
* \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.
*/
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.
*/
template<class... ArgU>
void setParams(ArgU&&... arg)
{ param=std::make_tuple(std::forward<ArgU>(arg)...); }
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()...); }
std::function<R(ArgT&...)> func; /**> a functor whith hold the pointer to a callback function.*/
std::tuple<RefVal<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,ToStore_t<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... Arg>
void setParams(Arg&&... arg)
{
using StaticType =
FastDelegateImpl<R,ToStore_t<Arg>...>*;
static_cast<StaticType>(delegate.get())->setParams(std::forward<Arg>(arg)...);
}
private:
std::unique_ptr<Delegate<R>> delegate; /**> holds the pointer to the generic delegate.*/
};
}
#endif |
Crash lors du passage d'un objet à un tuple que je cast par la suite.
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