55 lines
1.4 KiB
C++
55 lines
1.4 KiB
C++
// Copyright (c) 2022 NetEase, Inc. All rights reserved.
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// Use of this source code is governed by a MIT license that can be
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// found in the LICENSE file.
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#ifndef BASE_SINGLETON_H_
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#define BASE_SINGLETON_H_
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#include <memory>
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#include <mutex>
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namespace utils {
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template <typename T>
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class Singleton {
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public:
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static T* getInstance();
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Singleton(const Singleton& other) = delete;
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Singleton<T>& operator=(const Singleton& other) = delete;
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private:
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static std::mutex mutex;
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static T* instance;
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};
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template <typename T>
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std::mutex Singleton<T>::mutex;
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template <typename T>
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T* Singleton<T>::instance;
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template <typename T>
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T* Singleton<T>::getInstance() {
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if (instance == nullptr) {
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std::lock_guard<std::mutex> locker(mutex);
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if (instance == nullptr) {
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instance = new T();
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}
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}
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return instance;
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}
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#define SINGLETONG(Class) \
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private: \
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friend class utils::Singleton<Class>; \
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\
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public: \
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static Class* getInstance() { return utils::Singleton<Class>::getInstance(); }
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#define HIDE_CONSTRUCTOR(Class) \
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private: \
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Class() = default; \
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Class(const Class& other) = delete; \
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Class& operator=(const Class& other) = delete; \
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}
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}
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#endif // BASE_SINGLETON_H_
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