libstdc++-v3/testsuite/21_strings/basic_string/modifiers/assign/char/move_assign.cc

   1 // { dg-do run { target c++11 } }
   2 // { dg-require-string-conversions "" }
   3
   4 // Copyright (C) 2010-2024 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 // NOTE: This makes use of the fact that we know how moveable
  22 // is implemented on string (via swap). If the implementation changes
  23 // this test may begin to fail.
  24
  25 #include <string>
  26 #include <utility>
  27 #include <testsuite_hooks.h>
  28
  29 void test01()
  30 {
  31   std::string a, b;
  32   a.push_back('1');
  33   b.assign(std::move(a));
  34   VERIFY( b.size() == 1 && b[0] == '1' && a.size() == 0 );
  35
  36   // True for std::allocator because is_always_equal, but not true in general:
  37   static_assert(noexcept(a.assign(std::move(b))), "lwg 2063");
  38 }
  39
  40 int main()
  41 {
  42   test01();
  43   return 0;
  44 }