c++单例模式示例代码

头文件

class MyClass
{
public:
    static MyClass * getInstance();

private:
    MyClass();
    static MyClass * m_pMyClass;
};


#define MyClassInstance   (*MyClass::getInstance())

cpp文件

MyClass * MyClass::m_pMyClass;

MyClass::MyClass()
{
    m_pMyClass = Q_NULLPTR;
}

MyClass *MyClass::getInstance()
{
    if(Q_NULLPTR == m_pMyClass)
    {
        m_pMyClass = new MyClass();
    }

    return  m_pMyClass;
}