47 lines
818 B
C++
47 lines
818 B
C++
/*
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SPDX-FileCopyrightText: 2013 Ivan Cukic <ivan.cukic(at)kde.org>
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SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef SHARED_SINGLETON_P_H
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#define SHARED_SINGLETON_P_H
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#include <memory>
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namespace utils
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{
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template<typename Target>
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class SharedSingleton
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{
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public:
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static std::shared_ptr<Target> instance()
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{
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// TODO: Make this thread safe
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auto ptr = s_instance.lock();
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if (!ptr) {
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ptr = std::make_shared<Target>();
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s_instance = ptr;
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}
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return ptr;
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}
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operator bool() const
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{
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return !s_instance.expired();
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}
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private:
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static std::weak_ptr<Target> s_instance;
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};
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template<typename Target>
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std::weak_ptr<Target> SharedSingleton<Target>::s_instance;
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} // namespace utils
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#endif /* SHARED_SINGLETON_P_H */
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