boost/describe/enum_to_string.hpp

0001 #ifndef BOOST_DESCRIBE_ENUM_TO_STRING_HPP_INCLUDED
0002 #define BOOST_DESCRIBE_ENUM_TO_STRING_HPP_INCLUDED
0003
0004 // Copyright 2020, 2021 Peter Dimov
0005 // Distributed under the Boost Software License, Version 1.0.
0006 // https://www.boost.org/LICENSE_1_0.txt
0007
0008 #include <boost/describe/detail/config.hpp>
0009
0010 #if defined(BOOST_DESCRIBE_CXX14)
0011
0012 #include <boost/describe/enumerators.hpp>
0013 #include <boost/mp11/algorithm.hpp>
0014
0015 #if defined(_MSC_VER) && _MSC_VER == 1900
0016 # pragma warning(push)
0017 # pragma warning(disable: 4100) // unreferenced formal parameter
0018 #endif
0019
0020 namespace boost
0021 {
0022 namespace describe
0023 {
0024
0025 template<class E, class De = describe_enumerators<E>>
0026 char const * enum_to_string( E e, char const* def ) noexcept
0027 {
0028     char const * r = def;
0029
0030     mp11::mp_for_each<De>([&](auto D){
0031
0032         if( e == D.value ) r = D.name;
0033
0034     });
0035
0036     return r;
0037 }
0038
0039 } // namespace describe
0040 } // namespace boost
0041
0042 #if defined(_MSC_VER) && _MSC_VER == 1900
0043 # pragma warning(pop)
0044 #endif
0045
0046 #endif // defined(BOOST_DESCRIBE_CXX14)
0047
0048 #endif // #ifndef BOOST_DESCRIBE_ENUM_TO_STRING_HPP_INCLUDED