test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.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
//
//===----------------------------------------------------------------------===//

// <string>

// template<> struct char_traits<wchar_t>

// static void assign(char_type& c1, const char_type& c2);
// constexpr in C++17

// UNSUPPORTED: libcpp-has-no-wide-characters

#include <string>
#include <cassert>

#include "test_macros.h"

#if TEST_STD_VER > 14
constexpr bool test_constexpr()
{
    wchar_t c = L'1';
    std::char_traits<wchar_t>::assign(c, L'a');
    return c == L'a';
}
#endif

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

#if TEST_STD_VER > 14
    static_assert(test_constexpr(), "" );
#endif

  return 0;
}