dynarmic/include/mp/traits/function_info.h
MerryMage 7b0c47d3f0 Squashed 'externals/mp/' content from commit 29cb5588d
git-subtree-dir: externals/mp
git-subtree-split: 29cb5588da3a18ed571a0e41622900a01b9f01eb
2020-04-22 21:05:25 +01:00

64 lines
1.7 KiB
C++

/* This file is part of the mp project.
* Copyright (c) 2017 MerryMage
* SPDX-License-Identifier: 0BSD
*/
#pragma once
#include <cstddef>
#include <tuple>
#include <mp/typelist/list.h>
namespace mp {
template<class F>
struct function_info : public function_info<decltype(&F::operator())> {};
template<class R, class... As>
struct function_info<R(As...)> {
using return_type = R;
using parameter_list = list<As...>;
static constexpr std::size_t parameter_count = sizeof...(As);
using equivalent_function_type = R(As...);
template<std::size_t I>
struct parameter {
static_assert(I < parameter_count, "Non-existent parameter");
using type = std::tuple_element_t<I, std::tuple<As...>>;
};
};
template<class R, class... As>
struct function_info<R(*)(As...)> : public function_info<R(As...)> {};
template<class C, class R, class... As>
struct function_info<R(C::*)(As...)> : public function_info<R(As...)> {
using class_type = C;
};
template<class C, class R, class... As>
struct function_info<R(C::*)(As...) const> : public function_info<R(As...)> {
using class_type = C;
};
template<class F>
constexpr size_t parameter_count_v = function_info<F>::parameter_count;
template<class F>
using parameter_list = typename function_info<F>::parameter_list;
template<class F, std::size_t I>
using get_parameter = typename function_info<F>::template parameter<I>::type;
template<class F>
using equivalent_function_type = typename function_info<F>::equivalent_function_type;
template<class F>
using return_type = typename function_info<F>::return_type;
template<class F>
using class_type = typename function_info<F>::class_type;
} // namespace mp