//===----------------------------------------------------------------------===//
//
// 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: !stdlib=libc++ && (c++03 || c++11 || c++14)

// <string_view>

// constexpr basic_string_view& operator=(const basic_string_view &) noexcept = default;

#include <string_view>
#include <cassert>

#include "test_macros.h"

template <typename T>
#if TEST_STD_VER > 11
constexpr
#endif
    bool
    test(T sv0) {
  T sv1;
  sv1 = sv0;
  //  We can't just say "sv0 == sv1" here because string_view::compare
  //  isn't constexpr until C++17, and we want to support back to C++14
  return sv0.size() == sv1.size() && sv0.data() == sv1.data();
}

int main(int, char**) {
  assert(test<std::string_view>("1234"));
#ifndef TEST_HAS_NO_CHAR8_T
  assert(test<std::u8string_view>(u8"1234"));
#endif
#if TEST_STD_VER >= 11
  assert(test<std::u16string_view>(u"1234"));
  assert(test<std::u32string_view>(U"1234"));
#endif
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
  assert(test<std::wstring_view>(L"1234"));
#endif

#if TEST_STD_VER > 11
  static_assert(test<std::string_view>({"abc", 3}), "");
#  ifndef TEST_HAS_NO_CHAR8_T
  static_assert(test<std::u8string_view>({u8"abc", 3}), "");
#  endif
  static_assert(test<std::u16string_view>({u"abc", 3}), "");
  static_assert(test<std::u32string_view>({U"abc", 3}), "");
#  ifndef TEST_HAS_NO_WIDE_CHARACTERS
  static_assert(test<std::wstring_view>({L"abc", 3}), "");
#  endif
#endif

  return 0;
}