libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/assign2.pass.cpp

//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// <string>

// template<> struct char_traits<char8_t>

// static constexpr void assign(char_type& c1, const char_type& c2);

#include <string>
#include <cassert>

#include "test_macros.h"

#if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
constexpr bool test_constexpr()
{
    char8_t c = u'1';
    std::char_traits<char8_t>::assign(c, u'a');
    return c == u'a';
}

int main(int, char**)
{
    char8_t c = u8'\0';
    std::char_traits<char8_t>::assign(c, u8'a');
    assert(c == u8'a');

    static_assert(test_constexpr(), "");
    return 0;
}
#else
int main(int, char**) {
  return 0;
}
#endif