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66 lines
1.9 KiB
66 lines
1.9 KiB
#pragma once
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#include <type_traits>
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#include <tuple>
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#include <functional>
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namespace vlc
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{
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template <typename T>
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struct function_traits
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: public function_traits<decltype(&T::operator())>
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{};
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template<typename R, typename ...Args>
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struct function_traits<R(Args...)>
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{
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static const size_t nargs = sizeof...(Args);
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using result_type = R;
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using function_type = R(Args...);
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template <size_t i>
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struct arg
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{
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using type = typename std::tuple_element<i, std::tuple<Args...>>::type;
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};
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};
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template <typename ReturnType, typename... Args>
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struct function_traits<ReturnType(*)(Args...)>
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: public function_traits<ReturnType(Args...)>
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{};
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template <typename ClassType, typename ReturnType, typename... Args>
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struct function_traits<ReturnType(ClassType::*)(Args...)>
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: public function_traits<ReturnType(Args...)>
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{
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typedef ClassType& owner_type;
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};
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template <typename ClassType, typename ReturnType, typename... Args>
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struct function_traits<ReturnType(ClassType::*)(Args...) const>
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: public function_traits<ReturnType(Args...)>
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{
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typedef const ClassType& owner_type;
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};
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template <typename ClassType, typename ReturnType, typename... Args>
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struct function_traits<ReturnType(ClassType::*)(Args...) volatile>
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: public function_traits<ReturnType(Args...)>
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{
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typedef volatile ClassType& owner_type;
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};
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template <typename ClassType, typename ReturnType, typename... Args>
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struct function_traits<ReturnType(ClassType::*)(Args...) const volatile>
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: public function_traits<ReturnType(Args...)>
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{
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typedef const volatile ClassType& owner_type;
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};
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template <typename FunctionType>
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struct function_traits<std::function<FunctionType>>
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: public function_traits<FunctionType>
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{};
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}
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