afb81b8278
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96 lines
2.2 KiB
C++
96 lines
2.2 KiB
C++
// This file is part of Desktop App Toolkit,
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// a set of libraries for developing nice desktop applications.
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//
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// For license and copyright information please follow this link:
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// https://github.com/desktop-app/legal/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 <vector>
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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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~lifetime() { destroy(); }
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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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void release();
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template <typename Type, typename... Args>
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Type *make_state(Args&& ...args) {
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const auto result = new Type(std::forward<Args>(args)...);
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add([=] {
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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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private:
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std::vector<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.emplace_back(std::forward<Destroy>(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.end(),
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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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auto callbacks = details::take(_callbacks);
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for (auto i = callbacks.rbegin(), e = callbacks.rend(); i != e; ++i) {
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(*i)();
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}
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}
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inline void lifetime::release() {
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_callbacks.clear();
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}
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} // namespace rpl
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