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54 lines
996 B
C++
54 lines
996 B
C++
#ifndef _H_LP_SINGLETON_BASE_H_
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#define _H_LP_SINGLETON_BASE_H_
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#include <mutex>
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#include <atomic>
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template<class T>
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class lp_singleton_base
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{
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public:
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static T* instance()
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{
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T *sin = s_this.load(std::memory_order_acquire);
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if (!sin) {
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std::lock_guard<std::mutex> locker(s_mutex);
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sin = s_this.load(std::memory_order_relaxed);
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if (!sin) {
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sin = new T;
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s_this.store(sin, std::memory_order_release);
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}
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}
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return sin;
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}
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static void uninstance()
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{
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T *sin = s_this.load(std::memory_order_relaxed);
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if (sin) {
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std::lock_guard<std::mutex> locker(s_mutex);
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delete sin;
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sin = nullptr;
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}
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}
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protected:
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lp_singleton_base() = default;
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virtual ~lp_singleton_base() = default;
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private:
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lp_singleton_base(const T&) = delete;
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T& operator=(const T&) = delete;
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static std::atomic<T*> s_this;
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static std::mutex s_mutex;
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};
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template<class T>
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std::atomic<T*> lp_singleton_base<T>::s_this;
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template<class T>
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std::mutex lp_singleton_base<T>::s_mutex;
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#endif |