65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
/*
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* This file is open source software, licensed to you under the terms
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* of the Apache License, Version 2.0 (the "License"). See the NOTICE file
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* distributed with this work for additional information regarding copyright
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* ownership. You may not use this file except in compliance with the License.
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*
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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/*
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* Copyright 2015 Cloudius Systems
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*/
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#pragma once
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#include <tuple>
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template<typename T>
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struct function_traits;
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template<typename Ret, typename... Args>
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struct function_traits<Ret(Args...)>
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{
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using return_type = Ret;
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using args_as_tuple = std::tuple<Args...>;
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static constexpr std::size_t arity = sizeof...(Args);
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template <std::size_t N>
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struct arg
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{
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static_assert(N < arity, "no such parameter index.");
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using type = typename std::tuple_element<N, std::tuple<Args...>>::type;
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};
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};
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template<typename Ret, typename... Args>
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struct function_traits<Ret(*)(Args...)> : public function_traits<Ret(Args...)>
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{};
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template <typename T, typename Ret, typename... Args>
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struct function_traits<Ret(T::*)(Args...)> : public function_traits<Ret(Args...)>
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{};
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template <typename T, typename Ret, typename... Args>
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struct function_traits<Ret(T::*)(Args...) const> : public function_traits<Ret(Args...)>
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{};
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template <typename T>
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struct function_traits : public function_traits<decltype(&T::operator())>
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{};
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template<typename T>
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struct function_traits<T&> : public function_traits<std::remove_reference_t<T>>
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{};
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