libstdc++-v3/testsuite/21_strings/basic_string_view/operations/copy/char/2.cc

   1 // Copyright (C) 2018-2024 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-do run { target c++17 } }
  19
  20 #include <string_view>
  21 #include <testsuite_hooks.h>
  22
  23 using char_type = char;
  24
  25 // PR libstdc++/88084
  26 // LWG 2777. basic_string_view::copy should use char_traits::copy
  27
  28 struct traits : std::char_traits<char_type>
  29 {
  30   static char_type*
  31   copy(char_type* s, const char_type* p, std::size_t n)
  32   {
  33     while (n--)
  34       *s++ = 'X';
  35     return s;
  36   }
  37 };
  38
  39 void
  40 test01()
  41 {
  42   std::basic_string_view<char_type, traits> s = "abc";
  43   char_type buf[3] = { '1', '2', '3' };
  44   auto len = s.copy(buf, 3, 1);
  45   VERIFY( len == 2 );
  46   VERIFY( buf[0] == 'X' );
  47   VERIFY( buf[1] == 'X' );
  48   VERIFY( buf[2] == '3' );
  49 }
  50
  51 int
  52 main()
  53 {
  54   test01();
  55 }