AMDG John O. Woods wrote:

I attempted to compile this --

#ifdef ValueType # undef ValueType #endif #ifdef key_equal # undef key_equal #endif #include int main() { return 0; }

-- but no luck, same set of errors.

Steven: I have preprocessor output, but no clue what to do with it. It's quite long.

Thanks for your continued assistance, both of you.

I usually search for the name of the offending file, since the preprocessor inserts that information. The name is extract_key.hpp, find line 17. You could also grep for map_extractor. The offending line will probably be the first result. In Christ, Steven Watanabe