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On some compilers, friend functions are being instantiated when the main class is explicitly instantiated. This is slightly problematic because the equality functions (which are an extension) put extra requirements on the types used. So I'm going to try defining the functions outside of the class, in the hope that they won't get instantiated. If someone wants non-member functions to be instantiated, I think it's reasonable to expect them to explicitly instantiate them, especially as compilers don't seem to be consistent about this. [SVN r46579]