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