91 lines
2.1 KiB
C++
91 lines
2.1 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 "base/unique_function.h"
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#include <deque>
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namespace rpl {
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namespace details {
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template <typename Type>
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inline Type take(Type &value) {
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return std::exchange(value, Type{});
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}
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} // namespace details
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class lifetime {
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public:
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lifetime() = default;
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lifetime(lifetime &&other);
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lifetime &operator=(lifetime &&other);
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template <typename Destroy, typename = decltype(std::declval<Destroy>()())>
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lifetime(Destroy &&destroy);
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explicit operator bool() const { return !_callbacks.empty(); }
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template <typename Destroy, typename = decltype(std::declval<Destroy>()())>
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void add(Destroy &&destroy);
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void add(lifetime &&other);
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void destroy();
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template <typename Type, typename... Args>
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Type *make_state(Args&& ...args) {
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auto result = new Type(std::forward<Args>(args)...);
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add([result] {
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static_assert(sizeof(Type) > 0, "Can't delete unknown type.");
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delete result;
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});
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return result;
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}
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~lifetime() { destroy(); }
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private:
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std::deque<base::unique_function<void()>> _callbacks;
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};
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inline lifetime::lifetime(lifetime &&other)
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: _callbacks(details::take(other._callbacks)) {
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}
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inline lifetime &lifetime::operator=(lifetime &&other) {
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std::swap(_callbacks, other._callbacks);
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other.destroy();
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return *this;
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}
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template <typename Destroy, typename>
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inline lifetime::lifetime(Destroy &&destroy) {
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_callbacks.emplace_back(std::forward<Destroy>(destroy));
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}
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template <typename Destroy, typename>
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inline void lifetime::add(Destroy &&destroy) {
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_callbacks.push_front(destroy);
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}
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inline void lifetime::add(lifetime &&other) {
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auto callbacks = details::take(other._callbacks);
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_callbacks.insert(
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_callbacks.begin(),
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std::make_move_iterator(callbacks.begin()),
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std::make_move_iterator(callbacks.end()));
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}
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inline void lifetime::destroy() {
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for (auto &callback : details::take(_callbacks)) {
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callback();
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}
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}
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} // namespace rpl
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