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Clang provides __is_same that doesn't produce any instantiations and just returns a bool. It's a lot faster than using std::is_same I'll follow up with a patch to actually start using it. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@364148 91177308-0d34-0410-b5e6-96231b3b80d8