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We can use diagnostic pragmas to allow the constexpr if version of this function to be used for C++14 as well. We still need the __and_ version for C++11 because we can't use 'if' in constexpr functions at all before C++14. Also use the integral_constant::value static data member instead of invoking integral_constant::operator(), as it's a tiny bit cheaper to compiler. libstdc++-v3/ChangeLog: * include/bits/hashtable.h (_Hashtable::_S_nothrow_move): Use diagnostic pragmas to allow constexpr if in C++14. Use value member instead of operator(). Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com>
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.