mirror of https://github.com/procxx/kepka.git
99 lines
3.5 KiB
C++
99 lines
3.5 KiB
C++
//
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// This file is part of Kepka,
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// an unofficial desktop version of Telegram messaging app,
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// see https://github.com/procxx/kepka
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//
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// Kepka is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// It is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// In addition, as a special exception, the copyright holders give permission
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// to link the code of portions of this program with the OpenSSL library.
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//
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// Full license: https://github.com/procxx/kepka/blob/master/LICENSE
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// Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
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// Copyright (c) 2017- Kepka Contributors, https://github.com/procxx
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//
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#pragma once
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#include "base/lambda.h"
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#include "base/weak_unique_ptr.h"
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#include <QPointer>
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// Guard lambda call by QObject* or enable_weak_from_this* pointers.
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namespace base {
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namespace lambda_internal {
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template <typename Lambda> class guard_with_QObject {
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public:
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template <typename OtherLambda>
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guard_with_QObject(const QObject *object, OtherLambda &&other)
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: _guard(object)
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, _callable(std::forward<OtherLambda>(other)) {}
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template <typename... OtherArgs, typename Return = decltype(std::declval<Lambda>()(std::declval<OtherArgs>()...))>
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Return operator()(OtherArgs &&... args) {
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return _guard ? _callable(std::forward<OtherArgs>(args)...) : Return();
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}
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template <typename... OtherArgs, typename Return = decltype(std::declval<Lambda>()(std::declval<OtherArgs>()...))>
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Return operator()(OtherArgs &&... args) const {
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return _guard ? _callable(std::forward<OtherArgs>(args)...) : Return();
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}
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private:
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QPointer<const QObject> _guard;
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Lambda _callable;
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};
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template <typename Lambda> class guard_with_weak {
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public:
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template <typename OtherLambda>
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guard_with_weak(const base::enable_weak_from_this *object, OtherLambda &&other)
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: _guard(base::make_weak_unique(object))
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, _callable(std::forward<OtherLambda>(other)) {}
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template <typename... OtherArgs, typename Return = decltype(std::declval<Lambda>()(std::declval<OtherArgs>()...))>
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Return operator()(OtherArgs &&... args) {
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return _guard ? _callable(std::forward<OtherArgs>(args)...) : Return{};
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}
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template <typename... OtherArgs, typename Return = decltype(std::declval<Lambda>()(std::declval<OtherArgs>()...))>
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Return operator()(OtherArgs &&... args) const {
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return _guard ? _callable(std::forward<OtherArgs>(args)...) : Return{};
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}
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private:
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base::weak_unique_ptr<const base::enable_weak_from_this> _guard;
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Lambda _callable;
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};
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template <typename Lambda> struct lambda_call_type<guard_with_QObject<Lambda>> {
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using type = lambda_call_type_t<Lambda>;
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};
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template <typename Lambda> struct lambda_call_type<guard_with_weak<Lambda>> {
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using type = lambda_call_type_t<Lambda>;
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};
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} // namespace lambda_internal
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template <typename Lambda> inline auto lambda_guarded(const QObject *object, Lambda &&lambda) {
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using Guarded = lambda_internal::guard_with_QObject<std::decay_t<Lambda>>;
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return Guarded(object, std::forward<Lambda>(lambda));
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}
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template <typename Lambda> inline auto lambda_guarded(const base::enable_weak_from_this *object, Lambda &&lambda) {
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using Guarded = lambda_internal::guard_with_weak<std::decay_t<Lambda>>;
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return Guarded(object, std::forward<Lambda>(lambda));
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}
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} // namespace base
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