call_wrapper.hpp

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#ifndef MSTL_CORE_FUNCTIONAL_CALL_WRAPPER_HPP__
#define MSTL_CORE_FUNCTIONAL_CALL_WRAPPER_HPP__

 
#include "MSTL/core/utility/tuple.hpp"
MSTL_BEGIN_NAMESPACE__


template <typename... Types>
struct call_wrapper {
private:
    template <typename Tuple>
    struct result_t;
 
    template <typename Func, typename... Args>
    struct result_t<_MSTL tuple<Func, Args...>>
        : _INNER __invoke_result_aux<Func, Args...> {};
 
    using Tuple = _MSTL tuple<decay_t<Types>...>;
 
    Tuple tup_; 

    template <size_t... Index>
    typename result_t<Tuple>::type __invoke(index_tuple<Index...> idx) {
        return _MSTL invoke(_MSTL get<Index>(_MSTL move(tup_))...);
    }
 
public:
    template <typename... Args>
    explicit call_wrapper(Args&&... args)
    : tup_(_MSTL forward<Args>(args)...) {}

    typename result_t<Tuple>::type operator ()() {
        using Indices = build_index_tuple_t<tuple_size_v<Tuple>>;
        return this->__invoke(Indices());
    }
};
 
#ifdef MSTL_SUPPORT_DEDUCTION_GUIDES__
template <typename... Types>
call_wrapper(Types...) -> call_wrapper<Types...>;
#endif
 // CallWrapper
 
MSTL_END_NAMESPACE__
#endif // MSTL_CORE_FUNCTIONAL_CALL_WRAPPER_HPP__