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SingletonPattern.cpp
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55 lines (45 loc) · 747 Bytes
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/*
单例模式：一个类只能拥有一个实例
*/
#include <iostream>
#include <string>
using namespace std;
class Singleton
{
public:
static Singleton* GetInstance()
{
if (NULL == singleton_)
{
singleton_ = new Singleton();
}
return singleton_;
}
private:
static Singleton* singleton_;
};
Singleton* Singleton::singleton_ = NULL;
class SingletonMultiThread
{
public:
static SingletonMultiThread* GetInstance()
{
if (NULL == singleton_)
{
/*TODO:同步*/
if (NULL == singleton_)
{
singleton_ = new SingletonMultiThread();
}
}
return singleton_;
}
private:
static SingletonMultiThread* singleton_;
};
SingletonMultiThread* SingletonMultiThread::singleton_ = NULL;
int main()
{
system("pause");
return 0;
}