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Merge pull request #55 from nmcclatchey/minimal-headers
Minimize Windows headers
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| /// \file mingw.invoke.h | ||
| /// \brief Lightweight `invoke` implementation, for C++11 and C++14. | ||
| /// | ||
| /// (c) 2018-2019 by Nathaniel J. McClatchey, San Jose, CA, United States | ||
| /// \author Nathaniel J. McClatchey, PhD | ||
| /// | ||
| /// \copyright Simplified (2-clause) BSD License. | ||
| /// | ||
| /// \note This file may become part of the mingw-w64 runtime package. If/when | ||
| /// this happens, the appropriate license will be added, i.e. this code will | ||
| /// become dual-licensed, and the current BSD 2-clause license will stay. | ||
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| #ifndef MINGW_INVOKE_H_ | ||
| #define MINGW_INVOKE_H_ | ||
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| #include <type_traits> // For std::result_of, etc. | ||
| #include <utility> // For std::forward | ||
| #include <functional> // For std::reference_wrapper | ||
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| namespace mingw_stdthread | ||
| { | ||
| namespace detail | ||
| { | ||
| // For compatibility, implement std::invoke for C++11 and C++14 | ||
| #if __cplusplus < 201703L | ||
| template<bool PMemFunc, bool PMemData> | ||
| struct Invoker | ||
| { | ||
| template<class F, class... Args> | ||
| inline static typename std::result_of<F(Args...)>::type invoke (F&& f, Args&&... args) | ||
| { | ||
| return std::forward<F>(f)(std::forward<Args>(args)...); | ||
| } | ||
| }; | ||
| template<bool> | ||
| struct InvokerHelper; | ||
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| template<> | ||
| struct InvokerHelper<false> | ||
| { | ||
| template<class T1> | ||
| inline static auto get (T1&& t1) -> decltype(*std::forward<T1>(t1)) | ||
| { | ||
| return *std::forward<T1>(t1); | ||
| } | ||
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| template<class T1> | ||
| inline static auto get (const std::reference_wrapper<T1>& t1) -> decltype(t1.get()) | ||
| { | ||
| return t1.get(); | ||
| } | ||
| }; | ||
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| template<> | ||
| struct InvokerHelper<true> | ||
| { | ||
| template<class T1> | ||
| inline static auto get (T1&& t1) -> decltype(std::forward<T1>(t1)) | ||
| { | ||
| return std::forward<T1>(t1); | ||
| } | ||
| }; | ||
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| template<> | ||
| struct Invoker<true, false> | ||
| { | ||
| template<class T, class F, class T1, class... Args> | ||
| inline static auto invoke (F T::* f, T1&& t1, Args&&... args) ->\ | ||
| decltype((InvokerHelper<std::is_base_of<T,typename std::decay<T1>::type>::value>::get(std::forward<T1>(t1)).*f)(std::forward<Args>(args)...)) | ||
| { | ||
| return (InvokerHelper<std::is_base_of<T,typename std::decay<T1>::type>::value>::get(std::forward<T1>(t1)).*f)(std::forward<Args>(args)...); | ||
| } | ||
| }; | ||
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| template<> | ||
| struct Invoker<false, true> | ||
| { | ||
| template<class T, class F, class T1, class... Args> | ||
| inline static auto invoke (F T::* f, T1&& t1, Args&&... args) ->\ | ||
| decltype(InvokerHelper<std::is_base_of<T,typename std::decay<T1>::type>::value>::get(t1).*f) | ||
| { | ||
| return InvokerHelper<std::is_base_of<T,typename std::decay<T1>::type>::value>::get(t1).*f; | ||
| } | ||
| }; | ||
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| template<class F, class... Args> | ||
| struct InvokeResult | ||
| { | ||
| typedef Invoker<std::is_member_function_pointer<typename std::remove_reference<F>::type>::value, | ||
| std::is_member_object_pointer<typename std::remove_reference<F>::type>::value && | ||
| (sizeof...(Args) == 1)> invoker; | ||
| inline static auto invoke (F&& f, Args&&... args) -> decltype(invoker::invoke(std::forward<F>(f), std::forward<Args>(args)...)) | ||
| { | ||
| return invoker::invoke(std::forward<F>(f), std::forward<Args>(args)...); | ||
| }; | ||
| }; | ||
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| template<class F, class...Args> | ||
| auto invoke (F&& f, Args&&... args) -> decltype(InvokeResult<F, Args...>::invoke(std::forward<F>(f), std::forward<Args>(args)...)) | ||
| { | ||
| return InvokeResult<F, Args...>::invoke(std::forward<F>(f), std::forward<Args>(args)...); | ||
| } | ||
| #else | ||
| using std::invoke; | ||
| #endif | ||
| } // Namespace "detail" | ||
| } // Namespace "mingw_stdthread" | ||
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| #endif |
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