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I have found this to cause unnecessary methods having to be virtualized in order to replace concrete objects with test objects in a class being tested, which ended up getting quite messy at times, so I essentially had to settle for the "friend" solution.
In C++ you can either use static polymorphism or dynamic polymorphism to get substitutability of test doubles for real collaborators. I've done both, depending on the situation. If I had to choose between which I like least: virtual functions or "friend", I choose friend. I generally consider "friend" declarations a code smell that indicates poor class design. -- "The Direct3D Graphics Pipeline" -- DirectX 9 version available for download http://legalizeadulthood.wordpress.com/the-direct3d-graphics-pipeline/ Legalize Adulthood! http://legalizeadulthood.wordpress.com