libstdc++-v3/testsuite/21_strings/basic_string_view/operations/string_conversion/1.cc

   1 // { dg-options "-std=gnu++17" }
   2 // { dg-do run { target c++17 } }
   3
   4 // Copyright (C) 2014-2020 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 // basic_string_view::to_string
  22
  23 #include <string_view>
  24 #include <string>
  25 #include <algorithm>
  26 #include <testsuite_hooks.h>
  27 #include <testsuite_allocator.h>
  28
  29 void
  30 test01()
  31 {
  32   const char str_lit[] = "123456789A";
  33   const std::string_view sv(str_lit);
  34   char buffer[4] = { 0 };
  35
  36   std::string s1{sv};
  37   VERIFY( s1 == str_lit );
  38   using test_alloc = __gnu_test::tracker_allocator<char>;
  39   std::basic_string<char, std::char_traits<char>, test_alloc>
  40     s2{sv, test_alloc{}};
  41   static_assert( std::is_same<decltype(s2)::allocator_type, test_alloc>::value,
  42                  "to_string() uses custom allocator" );
  43   VERIFY( std::equal(s1.begin(), s1.end(), s2.begin(), s2.end()) );
  44   auto s3 = static_cast<std::string>(sv);
  45   VERIFY( s3 == s1 );
  46 }
  47
  48 int
  49 main()
  50 {
  51   test01();
  52 }