From: Tanton Gibbs I had a problem with using mpl::find and the std::find at the same time. Basically, my compiler, Compaq C++ V6.5-026, notes an ambiguity in find.hpp between the find_if that it uses and the find_if in the STL. I changed the line that reads struct find : find_if< Sequence, same_as<T> > {}; to be struct find : mpl::find_if< Sequence, same_as<T> > {}; and it works fine. I'm not sure if this is a compiler bug or if we need to find other occurences like this one and fix them. It shouldn't find std::find and std::find_if, unless they have been pulled in by a "using" declatation or directive. Could it be that you have that _before_ the MPL #include's? In that case, you should make sure that any such declaration/directive, in the global namespace, doesn't occur until after all #include's, for cpp-files, and not at all in header files. Regards, Terje [Non-text portions of this message have been removed]