正确的析构 静态实例和回收类
SingletonMode.cpp
#include <iostream>
class Singleton
{
private:
Singleton(){
std::cout << "构造" << std::endl;
};
~Singleton()
{
std::cout << "析构" << std::endl;
}
public:
static Singleton *getInstance()
{
static Singleton local_instance;
return &local_instance;
}
};
class SingletonPattern
{
private:
SingletonPattern()
{
std::cout << "创建单例模式对象！\n";
}
~SingletonPattern()
{
}
private:
static SingletonPattern* m_Instance;
public:
static SingletonPattern* GetInstance()
{
if (m_Instance == nullptr)
{
m_Instance = new SingletonPattern();
}
std::cout << "返回单例模式句柄！\n";
return m_Instance;
}
void display()
{
std::cout << "使用单例模式！\n" ;
}
private:
class CGabor
{
public:
~CGabor(){
if (SingletonPattern::m_Instance){
delete SingletonPattern::m_Instance;
SingletonPattern::m_Instance = NULL;
std::cout << "SingletonPattern 析构" << std::endl;
}
}
};
static CGabor m_Gabor;
};
SingletonPattern* SingletonPattern:: m_Instance = nullptr;
SingletonPattern::CGabor SingletonPattern::m_Gabor;
// g++ SingletonMode.cpp -o SingletonMode -std=c++11
int main()
{
Singleton *a = Singleton::getInstance();
Singleton *b = Singleton::getInstance();
if(a==b){
std::cout<< "a==b" <<'\n';
}
SingletonPattern* m_Test = SingletonPattern::GetInstance();
m_Test->display();
return 0;
}
