compile error cannot convert 'this' pointer

[George2]

Hello everyone,


Which C++ rule do I break in the following code? Why there is compile error?

class Foo{
public:
	Foo()
	{
	}

	int foo1()
	{
		return 100;
	}

	const Foo getCurrent1()
	{
		return *this;
	}

	const Foo& getCurrent2()
	{
		return *this;
	}
};

int main()
{
	Foo f;
	f.getCurrent1().foo1(); // error C2662: 'Foo::foo1' : cannot convert 'this' pointer from 'const Foo' to 'Foo &'
	f.getCurrent2().foo1(); // error C2662: 'Foo::foo1' : cannot convert 'this' pointer from 'const Foo' to 'Foo &'

	return 0;
}

thanks in advance,
George