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This merges various duplicate traits code scattered around the library into ext/type_traits.h. In doing so, all duplicate effort has been eliminated, and essential traits missing from std::tr1's <type_traits> have been found. If we find new and useful traits, they should go in <ext/type_traits.h>. If people want to use type_traits in their own code, I suggest using <tr1/type_traits> and <ext/type_traits.h> Nothing else is appropriate for user code. This clears the way for the eventual removal of bits/cpp_type_traits.h, but does not remove it. Everything in that file (maybe except for __is_char) can now be replaced at some future date by std::tr1's <type_traits>. (hopefully soon) Thanks to Paolo and Peter Doerfler, who had many great suggestions. Also found is annoying c++/21682. This makes our hack for std::tr1::atan2 quite fragile. -benjamin tested x86/linux performance tested x86/linux
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