类在项目中只有一个实例

Class MyClass
{
public:
static MyClass* GetInstance();
static void ReleaseInstance();
MyClass();
private:
static MyClass* handle;
}

MyClass* MyClass::handle = NULL;
MyClass* MyClass::GetInstance()
{
if(handle ==NULL){
handle = new MyClass();
}
return handle;
}

void MyClass::ReleaseInstance(){
if(handle !=NULL){
delete handle;
handle = NULL;
}
}

MyClass::MyClass()
{
}

#include "MyClass"

MyClass *myC = MyClass::GetInstance()