1#ifndef BOOST_DESCRIBE_ENUMERATORS_HPP_INCLUDED
2#define BOOST_DESCRIBE_ENUMERATORS_HPP_INCLUDED
3
4// Copyright 2020, 2021 Peter Dimov
5// Distributed under the Boost Software License, Version 1.0.
6// https://www.boost.org/LICENSE_1_0.txt
7
8#include <boost/describe/detail/void_t.hpp>
9#include <boost/describe/detail/config.hpp>
10
11#if defined(BOOST_DESCRIBE_CXX11)
12
13#include <type_traits>
14
15namespace boost
16{
17namespace describe
18{
19
20// describe_enumerators<E>
21
22template<class E> using describe_enumerators = decltype( boost_enum_descriptor_fn( static_cast<E**>(0) ) );
23
24// has_describe_enumerators<E>
25
26namespace detail
27{
28
29template<class E, class En = void> struct has_describe_enumerators: std::false_type
30{
31};
32
33template<class E> struct has_describe_enumerators<E, void_t<describe_enumerators<E>>>: std::true_type
34{
35};
36
37} // namespace detail
38
39template<class E> using has_describe_enumerators = detail::has_describe_enumerators<E>;
40
41} // namespace describe
42} // namespace boost
43
44#endif // defined(BOOST_DESCRIBE_CXX11)
45
46#endif // #ifndef BOOST_DESCRIBE_ENUMERATORS_HPP_INCLUDED
47

source code of boost/libs/describe/include/boost/describe/enumerators.hpp