test/std/strings/string.view/string.view.cons/from_string.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>

// template<class Allocator>
// basic_string_view(const basic_string<_CharT, _Traits, Allocator>& _str) noexcept

#include <string_view>
#include <string>
#include <cassert>

#include "test_macros.h"

struct dummy_char_traits : public std::char_traits<char> {};

template <typename CharT, typename Traits>
void test(const std::basic_string<CharT, Traits>& str) {
  typedef std::basic_string_view<CharT, Traits> SV;
  ASSERT_NOEXCEPT(SV(str));

  SV sv1(str);
  assert(sv1.size() == str.size());
  assert(sv1.data() == str.data());
}

int main(int, char**) {
  test(std::string("QBCDE"));
  test(std::string(""));
  test(std::string());

#ifndef TEST_HAS_NO_WIDE_CHARACTERS
  test(std::wstring(L"QBCDE"));
  test(std::wstring(L""));
  test(std::wstring());
#endif

#ifndef TEST_HAS_NO_CHAR8_T
  test(std::u8string{u8"QBCDE"});
  test(std::u8string{u8""});
  test(std::u8string{});
#endif

#if TEST_STD_VER >= 11
  test(std::u16string{u"QBCDE"});
  test(std::u16string{u""});
  test(std::u16string{});

  test(std::u32string{U"QBCDE"});
  test(std::u32string{U""});
  test(std::u32string{});
#endif

  test(std::basic_string<char, dummy_char_traits>("QBCDE"));
  test(std::basic_string<char, dummy_char_traits>(""));
  test(std::basic_string<char, dummy_char_traits>());

  return 0;
}