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The structure of these functions likely dates from the time before G++ fully supported C++14 extended constexpr, so that the throw expression had to be the operand of a conditional expression. That is not true now, so we can use a more straightforward version of the code. We can also simplify the declaration of __throw_bad_optional_access by using the C++11-style [[noreturn]] attribute so that a separate declaration isn't needed. libstdc++-v3/ChangeLog: * include/experimental/optional (__throw_bad_optional_access): Replace GNU attribute with C++11 attribute. (optional::value, optional::value_or): Use if statements instead of conditional expressions. * include/std/optional (__throw_bad_optional_access) (optional::value, optional::value_or): Likewise.
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.