forked from boostorg/endian
52 lines
1.2 KiB
C++
52 lines
1.2 KiB
C++
#ifndef BOOST_ENDIAN_DETAIL_IS_FIXED_ENUM_HPP_INCLUDED
|
|
#define BOOST_ENDIAN_DETAIL_IS_FIXED_ENUM_HPP_INCLUDED
|
|
|
|
// Copyright 2020 Peter Dimov
|
|
// Distributed under the Boost Software License, Version 1.0.
|
|
// https://www.boost.org/LICENSE_1_0.txt
|
|
|
|
#include <boost/endian/detail/is_scoped_enum.hpp>
|
|
#include <boost/type_traits/is_enum.hpp>
|
|
#include <boost/type_traits/remove_cv.hpp>
|
|
#include <boost/config.hpp>
|
|
|
|
namespace boost
|
|
{
|
|
namespace endian
|
|
{
|
|
namespace detail
|
|
{
|
|
|
|
#if __cplusplus >= 201703L || (defined(_MSVC_LANG) && _MSVC_LANG >= 201703L)
|
|
|
|
// Thanks to Will Wray for the T{0} idea, which unfortunately only works in C++17+
|
|
//
|
|
// VS2017 works, VS2019 works from 19.20 to 19.22, then in 19.23 starts accepting
|
|
// T{0} for unscoped non-fixed enums as well. Sad!
|
|
|
|
template<class T, class E = T> struct is_fixed_enum_impl: boost::false_type
|
|
{
|
|
};
|
|
|
|
template<class T> struct is_fixed_enum_impl<T, decltype(T{0})>: boost::is_enum<T>
|
|
{
|
|
};
|
|
|
|
template<class T> struct is_fixed_enum: is_fixed_enum_impl< boost::remove_cv_t<T> >
|
|
{
|
|
};
|
|
|
|
#else
|
|
|
|
template<class T> struct is_fixed_enum: is_scoped_enum<T>
|
|
{
|
|
};
|
|
|
|
#endif
|
|
|
|
} // namespace detail
|
|
} // namespace endian
|
|
} // namespace boost
|
|
|
|
#endif // BOOST_ENDIAN_DETAIL_IS_FIXED_ENUM_HPP_INCLUDED
|