50 lines
932 B
C
50 lines
932 B
C
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#ifndef __SINGLETON_H__
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#define __SINGLETON_H__
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#include <iostream>
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#include <string.h>
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#include <mutex>
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using namespace std;
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class Singleton_Lazy
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{
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public:
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static Singleton_Lazy* getInstance(){
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printf("This is Singleton Lazy mode...\n");
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if (instance == NULL){
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m_mutex.lock();
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if (instance == NULL){
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printf("创建新的实例\n");
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instance = new Singleton_Lazy();
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}
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m_mutex.unlock();
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}
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return instance;
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}
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private:
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Singleton_Lazy(){}
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static Singleton_Lazy* instance;
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static std::mutex m_mutex;
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};
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Singleton_Lazy* Singleton_Lazy::instance = NULL;
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std::mutex Singleton_Lazy::m_mutex;
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class Singleton_Hungry
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{
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public:
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static Singleton_Hungry* getInstance()
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{
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printf("This Singleton Hungry mode...\n");
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return instance;
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}
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private:
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Singleton_Hungry() {}
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static Singleton_Hungry* instance;
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};
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Singleton_Hungry* Singleton_Hungry::instance = new Singleton_Hungry;
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#endif //__SINGLETON_H__
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