//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// <locale>

// template <>
// class codecvt<char16_t, char, mbstate_t>
//     : public locale::facet,
//       public codecvt_base
// {
// public:
//     typedef char16_t  intern_type;
//     typedef char      extern_type;
//     typedef mbstate_t state_type;
//     ...
// };

#include <locale>
#include <type_traits>
#include <cassert>

int main(int, char**)
{
    typedef std::codecvt<char16_t, char, std::mbstate_t> F;
    static_assert((std::is_base_of<std::locale::facet, F>::value), "");
    static_assert((std::is_base_of<std::codecvt_base, F>::value), "");
    static_assert((std::is_same<F::intern_type, char16_t>::value), "");
    static_assert((std::is_same<F::extern_type, char>::value), "");
    static_assert((std::is_same<F::state_type, std::mbstate_t>::value), "");
    std::locale l = std::locale::classic();
    assert(std::has_facet<F>(l));
    const F& f = std::use_facet<F>(l);
    (void)F::id;
    ((void)f);

  return 0;
}