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();
}