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

   1 // Copyright (C) 2018-2023 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 "-O1 -g0" }
  19 // { dg-do compile { target c++11 } }
  20 // { dg-final { scan-assembler-not "__throw_length_error" } }
  21 // { dg-final { scan-assembler-not "__throw_bad_alloc" } }
  22
  23 #include <bits/c++config.h>
  24 #undef _GLIBCXX_EXTERN_TEMPLATE
  25 #include <string>
  26
  27 void
  28 test01(std::string& target, std::string&& source)
  29 {
  30   // The move assignment operator should be simple enough that the compiler
  31   // can see that it never results in a length_error or bad_alloc exception
  32   // (which would be turned into std::terminate by the noexcept on the
  33   // assignment operator). This is only true when inlining though.
  34 #ifndef __NO_INLINE__
  35   target = std::move(source);
  36 #endif
  37 }