libcxx/test/std/strings/string.view/string.view.deduct/iterator_sentinel.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 // UNSUPPORTED: c++03, c++11, c++14, c++17
   9
  10 // <string_view>
  11
  12 //  template <contiguous_iterator _It, sized_sentinel_for<_It> _End>
  13 //    basic_string_view(_It, _End) -> basic_string_view<iter_value_t<_It>>;
  14
  15 #include <string_view>
  16 #include <cassert>
  17
  18 #include "make_string.h"
  19 #include "test_macros.h"
  20 #include "test_iterators.h"
  21
  22 template <class It, class Sentinel, class CharT>
  23 constexpr void test_ctad(std::basic_string_view<CharT> val) {
  24   auto sv = std::basic_string_view(It(val.data()), Sentinel(It(val.data() + val.size())));
  25   ASSERT_SAME_TYPE(decltype(sv), std::basic_string_view<CharT>);
  26   assert(sv.data() == val.data());
  27   assert(sv.size() == val.size());
  28 }
  29
  30 template <class CharT>
  31 constexpr void test_with_char() {
  32   const auto val = MAKE_STRING_VIEW(CharT, "test");
  33   test_ctad<CharT*, CharT*>(val);
  34   test_ctad<CharT*, const CharT*>(val);
  35   test_ctad<const CharT*, CharT*>(val);
  36   test_ctad<const CharT*, sized_sentinel<const CharT*>>(val);
  37   test_ctad<contiguous_iterator<const CharT*>, contiguous_iterator<const CharT*>>(val);
  38   test_ctad<contiguous_iterator<const CharT*>, sized_sentinel<contiguous_iterator<const CharT*>>>(val);
  39 }
  40
  41 constexpr void test() {
  42   test_with_char<char>();
  43 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  44   test_with_char<wchar_t>();
  45 #endif
  46   test_with_char<char8_t>();
  47   test_with_char<char16_t>();
  48   test_with_char<char32_t>();
  49 }
  50
  51 int main(int, char**) {
  52   test();
  53
  54   return 0;
  55 }