test/std/strings/string.view/string.view.cons/from_ptr_len.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, size_type _len)
//      : __data (_s), __size(_len) {}

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

#include "test_macros.h"

template <typename CharT>
void test(const CharT* s, std::size_t sz) {
  {
    typedef std::basic_string_view<CharT> SV;
    LIBCPP_ASSERT_NOEXCEPT(SV(s, sz));

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

int main(int, char**) {
  test("QBCDE", 5);
  test("QBCDE", 2);
  test("", 0);
#if TEST_STD_VER > 11
  {
    constexpr const char* s = "QBCDE";
    constexpr std::basic_string_view<char> sv1(s, 2);
    static_assert(sv1.size() == 2, "");
    static_assert(sv1.data() == s, "");
  }
#endif

#ifndef TEST_HAS_NO_WIDE_CHARACTERS
  test(L"QBCDE", 5);
  test(L"QBCDE", 2);
  test(L"", 0);
#  if TEST_STD_VER > 11
  {
    constexpr const wchar_t* s = L"QBCDE";
    constexpr std::basic_string_view<wchar_t> sv1(s, 2);
    static_assert(sv1.size() == 2, "");
    static_assert(sv1.data() == s, "");
  }
#  endif
#endif // TEST_HAS_NO_WIDE_CHARACTERS

#if TEST_STD_VER >= 11
  test(u"QBCDE", 5);
  test(u"QBCDE", 2);
  test(u"", 0);
#  if TEST_STD_VER > 11
  {
    constexpr const char16_t* s = u"QBCDE";
    constexpr std::basic_string_view<char16_t> sv1(s, 2);
    static_assert(sv1.size() == 2, "");
    static_assert(sv1.data() == s, "");
  }
#  endif

  test(U"QBCDE", 5);
  test(U"QBCDE", 2);
  test(U"", 0);
#  if TEST_STD_VER > 11
  {
    constexpr const char32_t* s = U"QBCDE";
    constexpr std::basic_string_view<char32_t> sv1(s, 2);
    static_assert(sv1.size() == 2, "");
    static_assert(sv1.data() == s, "");
  }
#  endif
#endif

  return 0;
}