Singleton模式

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//GOF

// Header file Singleton.h

class Singleton {

public:

static Singleton *Instance()

{

if( !m_pInstatnce)

m_pInstance = new Singleton;

return m_pInstance;

}

void DoSomething();

private:

static Singleton *m_pInstatnce=NULL;

private:

Singleton();

Singleton(const Singleton&);

Singleton& operator=(const Singleton&);

~Singleton();

}

//Meyers Singleton

// Header file Singleton.h

class Singleton

{

public:

static Singleton *Instance()

{

static Singleton sInstance;

return &sInstance;

}

private:

Singleton();

Singleton(const Singleton&);

Singleton& operator=(const Singleton&);

~Singleton();

}

// Implementation file Singleton.cpp

Singleton* Singleton::m_pInstance = 0;

//Doug Schmidt & Tim Harrison

//可多线程

// Header file Singleton.h

class Singleton {

public:

static Singleton &Instance()

{

if( !m_pInstatnce)

{

lock(m_mutex);

if( !m_pInstance )

m_pInstance = new Singleton;

UnLock(m_mutex);

}

return *m_pInstance;

}

private:

static volatitle Singleton *m_pInstatnce;

static Mutex m_mutex;private: Singleton();

Singleton(const Singleton&);

Singleton& operator=(const Singleton&);

~Singleton();

}

// Implementation file Singleton.cpp

Mutex Singleton::_mutex;Singleton *Singleton:m_pInstatnce = NULL;