[Dev-C++] singleton pattern implementation.

[Laura L. <lau...@gm...>]

Hello,

I have a question about the next implementation of the singleton patter, if
I don't do "delete sc1" in main, is there a memory leak?  the problem is
that if I do in the destructor "delete single"  it produces an infinite
loop.

How could I free the memory associated to the variable single?

Thank you.

class Singleton
{
private:
    static bool instanceFlag;
    static Singleton *single;
    Singleton()
    {
        //private constructor
    }
public:
    static Singleton* getInstance();
    void method();
    ~Singleton()
    {
        instanceFlag = false;
    }
};

bool Singleton::instanceFlag = false;
Singleton* Singleton::single = NULL;
Singleton* Singleton::getInstance()
{
    if(! instanceFlag)
    {
        single = new Singleton();
        instanceFlag = true;
        return single;
    }
    else
    {
        return single;
    }
}

void Singleton::method()
{
    cout << "Method of the singleton class" << endl;
}

int main()
{
    Singleton *sc1;
    sc1 = Singleton::getInstance();
    sc1->method();

    return 0;
}