libstdc++-v3/testsuite/21_strings/basic_string_view/cons/char/range.cc

   1 // Copyright (C) 2019-2023 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-options "-std=gnu++20" }
  19 // { dg-do run { target c++20 } }
  20
  21 #include <string_view>
  22 #include <testsuite_hooks.h>
  23 #include <testsuite_iterators.h>
  24
  25 #if __STDC_HOSTED__
  26 # include <vector>
  27 #endif // HOSTED
  28
  29 constexpr char str[] = "abcdefg";
  30 constexpr std::basic_string_view<char> s(std::begin(str), std::cend(str) - 1);
  31 static_assert( s == str );
  32 static_assert( s.data() == str );
  33 constexpr std::basic_string_view ctad(std::begin(str), std::cend(str) - 1);
  34 static_assert( ctad == s );
  35
  36 // The standard does not require this constructor to have a noexcept-specifier.
  37 static_assert( noexcept(std::basic_string_view<char>(str, str)) );
  38 using I = __gnu_test::contiguous_iterator_wrapper<char>;
  39 static_assert( ! noexcept(std::basic_string_view<char>(I{}, I{})) );
  40
  41 void
  42 test01()
  43 {
  44 #if __STDC_HOSTED__
  45   std::vector<char> v{'a', 'b', 'c'};
  46   std::basic_string_view<char> s(v.begin(), v.end());
  47   VERIFY( s.data() == v.data() );
  48   std::basic_string_view ctad(v.begin(), v.end());
  49   VERIFY( ctad == s );
  50 #endif // HOSTED
  51 }
  52
  53 int
  54 main()
  55 {
  56   test01();
  57 }