114 lines
2.8 KiB
C++
114 lines
2.8 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#pragma once
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#include <QPointer>
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#include "base/weak_ptr.h"
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// Guard lambda call by QObject* or has_weak_ptr* pointers.
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namespace base {
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namespace lambda_internal {
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template <typename Lambda>
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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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}
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template <
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typename ...OtherArgs,
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typename Return = decltype(std::declval<Lambda>()(std::declval<OtherArgs>()...))>
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Return operator()(OtherArgs &&...args) {
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return _guard
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? _callable(std::forward<OtherArgs>(args)...)
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: Return();
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}
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template <
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typename ...OtherArgs,
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typename Return = decltype(std::declval<Lambda>()(std::declval<OtherArgs>()...))>
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Return operator()(OtherArgs &&...args) const {
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return _guard
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? _callable(std::forward<OtherArgs>(args)...)
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: 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>
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class guard_with_weak {
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public:
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template <typename OtherLambda>
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guard_with_weak(
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const base::has_weak_ptr *object,
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OtherLambda &&other)
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: _guard(base::make_weak(object))
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, _callable(std::forward<OtherLambda>(other)) {
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}
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template <
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typename ...OtherArgs,
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typename Return = decltype(std::declval<Lambda>()(std::declval<OtherArgs>()...))>
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Return operator()(OtherArgs &&...args) {
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return _guard
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? _callable(std::forward<OtherArgs>(args)...)
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: Return();
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}
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template <
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typename ...OtherArgs,
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typename Return = decltype(std::declval<Lambda>()(std::declval<OtherArgs>()...))>
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Return operator()(OtherArgs &&...args) const {
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return _guard
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? _callable(std::forward<OtherArgs>(args)...)
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: Return();
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}
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private:
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base::weak_ptr<const base::has_weak_ptr> _guard;
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Lambda _callable;
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};
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template <typename Lambda>
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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>
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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>
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inline auto lambda_guarded(const QObject *object, Lambda &&lambda) {
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using Guarded = lambda_internal::guard_with_QObject<
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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>
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inline auto lambda_guarded(
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const base::has_weak_ptr *object,
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Lambda &&lambda) {
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using Guarded = lambda_internal::guard_with_weak<
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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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