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//
// Copyright (c) 2022-2023 Alexander Grund
//
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#ifndef BOOST_LOCALE_DETAIL_FACET_ID_HPP_INCLUDED
#define BOOST_LOCALE_DETAIL_FACET_ID_HPP_INCLUDED
#include <boost/locale/config.hpp>
#include <locale>
/// \cond INTERNAL
namespace boost { namespace locale { namespace detail {
#if BOOST_CLANG_VERSION >= 40900
# pragma clang diagnostic push
# pragma clang diagnostic ignored "-Wundefined-var-template"
#endif
/// CRTP base class to hold the id required for facets
///
/// Required because the id needs to be defined in a CPP file and hence ex/imported for shared libraries.
/// However the virtual classes need to be declared as BOOST_VISIBLE to combine the VTables because otherwise
/// casts/virtual-calls might be flagged as invalid by UBSAN
template<class Derived>
struct BOOST_LOCALE_DECL facet_id {
static std::locale::id id;
};
#if BOOST_CLANG_VERSION >= 40900
# pragma clang diagnostic pop
#endif
}}} // namespace boost::locale::detail
/// \endcond
#endif
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