test/std/strings/string.view/string.view.access/data.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: !stdlib=libc++ && (c++03 || c++11 || c++14)

// <string_view>

// constexpr const _CharT* data() const noexcept;

#include <string_view>
#include <cassert>
#include <iterator>

#include "test_macros.h"

template <typename CharT>
void test(const CharT* s, std::size_t len) {
  std::basic_string_view<CharT> sv(s, len);
  assert(sv.length() == len);
  assert(sv.data() == s);
#if TEST_STD_VER > 14
  //  make sure we pick up std::data, too!
  assert(sv.data() == std::data(sv));
#endif
}

int main(int, char**) {
  test("ABCDE", 5);
  test("a", 1);

#ifndef TEST_HAS_NO_WIDE_CHARACTERS
  test(L"ABCDE", 5);
  test(L"a", 1);
#endif

#if TEST_STD_VER >= 11
  test(u"ABCDE", 5);
  test(u"a", 1);

  test(U"ABCDE", 5);
  test(U"a", 1);
#endif

#if TEST_STD_VER > 11
  {
    constexpr const char* s = "ABC";
    constexpr std::basic_string_view<char> sv(s, 2);
    static_assert(sv.length() == 2, "");
    static_assert(sv.data() == s, "");
  }
#endif

  return 0;
}