afb81b8278
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63 lines
1.2 KiB
C++
63 lines
1.2 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/assertion.h"
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namespace base {
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// This pointer is used for global non-POD variables that are allocated
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// on demand by createIfNull(lambda) and are never automatically freed.
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template <typename T>
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class NeverFreedPointer {
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public:
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NeverFreedPointer() = default;
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NeverFreedPointer(const NeverFreedPointer<T> &other) = delete;
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NeverFreedPointer &operator=(const NeverFreedPointer<T> &other) = delete;
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template <typename... Args>
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void createIfNull(Args&&... args) {
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if (isNull()) {
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reset(new T(std::forward<Args>(args)...));
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}
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};
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T *data() const {
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return _p;
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}
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T *release() {
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return base::take(_p);
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}
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void reset(T *p = nullptr) {
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delete _p;
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_p = p;
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}
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bool isNull() const {
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return data() == nullptr;
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}
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void clear() {
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reset();
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}
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T *operator->() const {
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return data();
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}
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T &operator*() const {
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Assert(!isNull());
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return *data();
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}
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explicit operator bool() const {
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return !isNull();
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}
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private:
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T *_p;
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};
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} // namespace base
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