test/std/strings/string.view/string.view.cons/from_literal.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 basic_string_view(const _CharT* _s)
//    : __data (_s), __size(_Traits::length(_s)) {}

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

#include "test_macros.h"
#include "constexpr_char_traits.h"

template <typename CharT>
size_t StrLen(const CharT* s) {
  std::size_t retVal = 0;
  while (*s != 0) {
    ++retVal;
    ++s;
  }
  return retVal;
}

template <typename CharT>
void test(const CharT* s) {
  typedef std::basic_string_view<CharT> SV;
  //  I'd love to do this, but it would require traits::length() to be noexcept
  //  LIBCPP_ASSERT_NOEXCEPT(SV(s));

  SV sv1(s);
  assert(sv1.size() == StrLen(s));
  assert(sv1.data() == s);
}

int main(int, char**) {
  test("QBCDE");
  test("A");
  test("");

#ifndef TEST_HAS_NO_WIDE_CHARACTERS
  test(L"QBCDE");
  test(L"A");
  test(L"");
#endif

#if TEST_STD_VER >= 11
  test(u"QBCDE");
  test(u"A");
  test(u"");

  test(U"QBCDE");
  test(U"A");
  test(U"");
#endif

#if TEST_STD_VER > 11
  {
    constexpr std::basic_string_view<char, constexpr_char_traits<char>> sv1("ABCDE");
    static_assert(sv1.size() == 5, "");
  }
#endif

  return 0;
}