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#include <functional>
#include <type_traits>
#include <utility>
template <std::size_t... Is>
struct indices {};
template <std::size_t N, std::size_t... Is>
struct build_indices
: build_indices<N-1, N-1, Is...> {};
template <std::size_t... Is>
struct build_indices<0, Is...> : indices<Is...> {};
template<int I> struct placeholder{};
namespace std{
template<int I>
struct is_placeholder< ::placeholder<I>> : std::integral_constant<int, I>{};
} // std::
namespace detail{
template<std::size_t... Is, class Ret, class Fn, class... MArgs, class... Args>
auto my_bind(indices<Is...>, Ret (Fn::*f)(MArgs...), Fn *i, Args&&... args)
-> decltype(std::bind(f, i, std::forward<Args>(args)..., placeholder<1 + Is>{}...)){
return std::bind(f, i, std::forward<Args>(args)..., placeholder<1 + Is>{}...);
}
}
template<class Ret, class... FArgs, class Fn, class... MArgs, class... Args>
auto my_bind(std::function<Ret(FArgs...)>, Ret (Fn::*f)(MArgs...), Fn *i, Args&&... args)
-> decltype(detail::my_bind(build_indices<sizeof...(FArgs) - sizeof...(Args)>{}, f, i, std::forward<Args>(args)...)){
return detail::my_bind(build_indices<sizeof...(FArgs) - sizeof...(Args)>{}, f, i, std::forward<Args>(args)...);
}
#include <iostream>
struct tmp{
void testt(int var1, int var2){
std::cout << var1 << " " << var2 << std::endl;
}
};
int main(){
tmp TMP;
auto f3 = my_bind(std::function<void(int, int)>(), &tmp::testt, &TMP);
f3(22, 23);
}
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