libstdc++-v3/testsuite/21_strings/basic_string/cons/char/self_move.cc

   1 // Copyright (C) 2020-2024 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++11 } }
  19
  20 #include <string>
  21 #include <debug/string>
  22 #include <testsuite_hooks.h>
  23
  24 template<typename String>
  25 void
  26 test(const char* s)
  27 {
  28   String s1 = s;
  29   std::string s2 __attribute__((unused)) = s1.c_str();
  30   s1 = std::move(s1);
  31
  32   String s3 __attribute__((unused)) = s1;
  33   s1 = std::move(s1);
  34
  35   (void) s1.begin(); // causes COW string to "leak"
  36   s1 = std::move(s1);
  37
  38   String s4 __attribute__((unused)) = s1;
  39   s1 = std::move(s1);
  40
  41   s1.reserve(2 * s1.capacity()); // causes SSO string to be on the heap
  42   s1 = std::move(s1);
  43 }
  44
  45 int
  46 main()
  47 {
  48   test<std::string>("short");
  49   test<std::string>("very, very, very, VERY long");
  50   test<__gnu_debug::string>("short");
  51   test<__gnu_debug::string>("very, very, very, VERY long");
  52 }