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66 lines
2.8 KiB
C++
66 lines
2.8 KiB
C++
/* Copyright (C) 2015
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* swift Project Community / Contributors
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*
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* This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
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* directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
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* including this file, may be copied, modified, propagated, or distributed except according to the terms
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* contained in the LICENSE file.
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*/
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//! \file
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#ifndef BLACKMISC_INVOKE_H
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#define BLACKMISC_INVOKE_H
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#include <tuple>
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#include "blackmisc/typetraits.h"
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#include "blackmisc/integersequence.h"
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namespace BlackMisc
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{
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//! \cond PRIVATE
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namespace Private
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{
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// Our own version of C++17 std::invoke().
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template <typename F, typename T, typename = std::enable_if_t<std::is_member_object_pointer<F>::value>>
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decltype(auto) invoke(F ptr, T &&object)
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{
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return std::forward<T>(object).*ptr;
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}
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template <typename F, typename T, typename... Ts, typename = std::enable_if_t<std::is_member_function_pointer<F>::value>>
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decltype(auto) invoke(F ptr, T &&object, Ts &&... args)
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{
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return (std::forward<T>(object).*ptr)(std::forward<Ts>(args)...);
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}
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template <typename F, typename... Ts, typename = std::enable_if_t<! std::is_member_pointer<std::decay_t<F>>::value>>
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decltype(auto) invoke(F &&func, Ts &&... args)
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{
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return std::forward<F>(func)(std::forward<Ts>(args)...);
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}
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// Like invoke() but ignores the first argument if callable is not a member function. For uniform calling of callables with slot semantics.
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template <typename F, typename T, typename U, size_t... Is>
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decltype(auto) invokeSlotImpl(F ptr, T *object, U tuple, std::index_sequence<Is...>, std::true_type)
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{
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Q_UNUSED(tuple); // in case the pack expansion is empty
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return (object->*ptr)(std::forward<std::tuple_element_t<Is, U>>(std::get<Is>(tuple))...);
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}
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template <typename F, typename T, typename U, size_t... Is>
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decltype(auto) invokeSlotImpl(F &&func, T *, U tuple, std::index_sequence<Is...>, std::false_type)
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{
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Q_UNUSED(tuple); // in case the pack expansion is empty
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return std::forward<F>(func)(std::forward<std::tuple_element_t<Is, U>>(std::get<Is>(tuple))...);
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}
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template <typename F, typename T, typename... Ts>
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decltype(auto) invokeSlot(F &&func, T *object, Ts &&... args)
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{
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using seq = MaskSequence<std::make_index_sequence<sizeof...(Ts)>, ! TIsQPrivateSignal<std::decay_t<Ts>>::value...>;
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return invokeSlotImpl(std::forward<F>(func), object, std::forward_as_tuple(std::forward<Ts>(args)...), seq(), std::is_member_pointer<std::decay_t<F>>());
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}
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}
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//! \endcond
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}
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#endif |