libstdc++-v3/testsuite/24_iterators/customization_points/iter_swap.cc

   1 // Copyright (C) 2019-2021 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 "-std=gnu++2a" }
  19 // { dg-do run { target c++2a } }
  20
  21 #include <iterator>
  22 #include <testsuite_hooks.h>
  23
  24 struct X
  25 {
  26   int value;
  27
  28   constexpr X(int i) : value(i) { }
  29
  30   X(const X&) = default;
  31   X& operator=(const X&) = default;
  32
  33   constexpr X& operator=(X&& x)
  34   {
  35     value = x.value;
  36     x.value = -1;
  37     return *this;
  38   }
  39 };
  40
  41 constexpr bool
  42 test_X(int i, int j)
  43 {
  44   X x1{i}, x2{j};
  45   std::ranges::iter_swap(&x1, &x2);
  46   return x1.value == j &&  x2.value == i;
  47 }
  48
  49 static_assert( test_X(1, 2) );
  50
  51 void
  52 test01()
  53 {
  54   VERIFY( test_X(3, 4) );
  55 }
  56
  57 int
  58 main()
  59 {
  60   test01();
  61 }