boost/describe/enumerators.hpp

0001 #ifndef BOOST_DESCRIBE_ENUMERATORS_HPP_INCLUDED
0002 #define BOOST_DESCRIBE_ENUMERATORS_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/void_t.hpp>
0009 #include <boost/describe/detail/config.hpp>
0010
0011 #if defined(BOOST_DESCRIBE_CXX11)
0012
0013 #include <type_traits>
0014
0015 namespace boost
0016 {
0017 namespace describe
0018 {
0019
0020 // describe_enumerators<E>
0021
0022 template<class E> using describe_enumerators = decltype( boost_enum_descriptor_fn( static_cast<E**>(0) ) );
0023
0024 // has_describe_enumerators<E>
0025
0026 namespace detail
0027 {
0028
0029 template<class E, class En = void> struct has_describe_enumerators: std::false_type
0030 {
0031 };
0032
0033 template<class E> struct has_describe_enumerators<E, void_t<describe_enumerators<E>>>: std::true_type
0034 {
0035 };
0036
0037 } // namespace detail
0038
0039 template<class E> using has_describe_enumerators = detail::has_describe_enumerators<E>;
0040
0041 } // namespace describe
0042 } // namespace boost
0043
0044 #endif // defined(BOOST_DESCRIBE_CXX11)
0045
0046 #endif // #ifndef BOOST_DESCRIBE_ENUMERATORS_HPP_INCLUDED