llvm/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/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<char>

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

#include <string>
#include <cassert>

#include "test_macros.h"

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

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

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

  return 0;
}