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mutual type refs

Started by xropi Nov 4, 2002 at 5:45 AM 3 replies 250+ views

Original Post

Nov 4, 2002 at 5:45 AM

In the following situation there are mutual references. The compiler tells me: error C2027: use of undefined type 'CTest'

          
class	CTest;

class CSmall {
	CTest::TT	m_x:         // error reported here

};


class CTest {
	typedef int TT;       // or any other type

	vector<CSmall>		m_xx;
};

If TT was in global scope, my problem would be solved. But what if this condition can't be realized? How would you handle that? [edited by - xropi on November 4, 2002 6:48:28 AM]

Pepe

Nov 4, 2002 at 5:59 AM

    
#include <vector>

using namespace std;

class CSmall;


class CTest {
public:
	typedef int TT;       // or any other type

private:
	vector<CSmall> m_xx;
};

class CSmall {
	CTest::TT m_x;
};

[edited by - Pepe on November 4, 2002 7:00:31 AM]

Evil Bill

Nov 4, 2002 at 8:11 AM

That won''t work. You need the structure implementation to create a vector of it (ISTR).

The only way i can see is to make m_xx a vector or CSmall*s.

HTH, Steve

Steve
DirectX Programmer
Soon to be the new Bill Gates

Qw3r7yU10p!

Nov 4, 2002 at 8:26 AM

so you want a class to be parameterised with another class... looks like time for templates

Pepe

Nov 4, 2002 at 9:15 AM

Evil Bill, what dou you want to mean with?

quote:

That won''t work.

I''ve compiled it.

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