C++函数返回含堆数据的对象时，内存释放问题

class MyClass
{
public:
    char *p;
    MyClass()
    {
        p = new char[1];
        p[0] = 'a';
        p[1] = 0;
    }

    ~MyClass()
    {
        delete [] p;
        p = 0;
    }
};

int _tmain(int argc, _TCHAR* argv[])
{
    MyClass _2010_9_25_b();
    MyClass c = _2010_9_25_b();
    
    void _2010_9_25_c();
    _2010_9_25_c();

    int a = 1;

    return 0;
}

MyClass _2010_9_25_b()
{
    return MyClass();
}

void _2010_9_25_c()
{
    MyClass();
}