C++单体模式的几个总结

1 通用简单单体
#include
using namespace std;
class Singleton
{
private:
static Singleton s;
int i;
Singleton(int x) : i(x) {}
Singleton(const Singleton&);
public:
static Singleton& instance()
{
return s;
}

int getValue()
{
return i;
}

void setValue(int x)
{
i = x;
}
};

Singleton Singleton::s(47);

int main()
{
Singleton& s = Singleton::instance();
cout <<ｓ．getValue() << endl;
Singleton& s2 = Singleton:: instance();
s2.setValue(9);
cout << s.getValue() << endl;
}