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//delegate.hpp
#include<memory>
#include<boost/mpl/apply.hpp>
#include<boost/mpl/if.hpp>
#include<boost/mpl/placeholders.hpp>
//#include"function_dyn.hpp"
//#include"ref_val.hpp"
//#include"to_store.hpp"
namespace odfaeg
{
namespace mpl = boost::mpl;
using mpl::placeholders::_;
//Système de callback incluant un stockage des paramètres
//(Interne) Classe interface pour le type-erasure
template<class R>
struct delegate_i
{
delegate_i() =default;
virtual ~delegate_i(){}
virtual std::unique_ptr<delegate_i> clone() const =0;
virtual R operator()() const = 0;
protected:
delegate_i(const delegate_i&){}
delegate_i& operator=(const delegate_i&)
{ return *this; }
};
//(Interne) Classe générique d'implémentation du type-erasure
template<class PFun, class R, class... ArgT>
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)...)
{}
std::unique_ptr<delegate_i<R>> clone() const
{ return std::make_unique<delegate_impl>(*this); }
R operator()() const
{ return call(std::make_index_sequence<sizeof...(ArgT)>()); }
template<class... ArgU>
void set(ArgU&&... arg)
{ param=std::make_tuple(std::forward<ArgU>(arg)...); }
private:
template<std::size_t... I>
R call(std::index_sequence<I...>) const
{ return func(std::get<I>(param).get()...); }
typename mpl::apply<
PFun,R(ArgT&...)
>::type func;
std::tuple<ref_val<ArgT>...> param;
};
//(Utilisateur) Classe métier du système
template<
class R,
class PFun =function_dyn<_>,
class PConv =mpl::if_<
std::is_same<std::decay<_>,const char*>,
std::string,_
>
>
struct delegate {
template<class F, class... Arg>
delegate(F&& f, Arg&&... arg) :
data(std::make_unique<delegate_impl<
PFun,R,
typename mpl::apply<to_store<PConv>,Arg>::type...
>>
(std::forward<F>(f),std::forward<Arg>(arg)...)
)
{}
delegate(const delegate& rhs)
: data(rhs.data->clone())
{}
delegate(delegate& rhs)
: data(rhs.data->clone())
{}
delegate(delegate&& rhs) =default;
delegate& operator=(const delegate& rhs)
{ return operator=(delegate(rhs)); }
delegate& operator=(delegate&&) =default;
R operator()() const
{ return (*data)(); }
template<class... Arg>
void set(Arg&&... arg)
{
using DynamicType = delegate_impl<
PFun,R,
typename mpl::apply<to_store<PConv>,Arg>::type...
>*;
if(dynamic_cast<DynamicType>(data.get()))
dynamic_cast<DynamicType>(data.get())->set(std::forward<Arg>(arg)...);
}
private:
std::unique_ptr<delegate_i<R>> data;
};
//(Utilisateur) Fonctions de création externe
template<class F, class... Arg>
delegate<decltype(std::declval<F>()(std::declval<Arg>()...))> make_delegate(F&& f, Arg&&... arg)
{ return {std::forward<F>(f),std::forward<Arg>(arg)...}; }
template<class R, class... Arg>
delegate<R> make_delegate(R (*pf)(std::decay_t<Arg>...), Arg&&... arg)
{ return {pf,std::forward<Arg>(arg)...}; }
template<class R, class C, class... ArgT, class... ArgU>
delegate<R> make_delegate(R (C::*pf)(ArgT...), ArgU&&... arg)
{ return {pf,std::forward<ArgU>(arg)...}; }
template<class R, class C, class... Arg>
delegate<R> make_delegate(R (C::*pf)(std::decay_t<Arg>...), C* c, Arg&&... arg)
{ return {pf,c,std::forward<Arg>(arg)...}; }
} |
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