libstdc++-v3/testsuite/20_util/tuple/swap.cc

   1 // { dg-do run { target c++11 } }
   2
   3 // Copyright (C) 2007-2024 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20
  21 // NOTE: This makes use of the fact that we know how moveable
  22 // is implemented on tuple.  If the implementation changed
  23 // this test may begin to fail.
  24
  25 #include <tuple>
  26 #include <utility>
  27 #include <testsuite_hooks.h>
  28
  29 struct MoveOnly
  30 {
  31   explicit MoveOnly (int j) : i(j) { }
  32
  33   MoveOnly (MoveOnly&& m) : i(m.i) { }
  34
  35   MoveOnly& operator=(MoveOnly&& m)
  36   { i = m.i; return *this; }
  37
  38   MoveOnly(MoveOnly const&) = delete;
  39   MoveOnly& operator=(MoveOnly const&) = delete;
  40
  41   bool operator==(MoveOnly const& m) const
  42   { return i == m.i; }
  43
  44   void swap(MoveOnly& m)
  45   { std::swap(m.i, i); }
  46
  47   int i;
  48 };
  49
  50 void swap(MoveOnly& m1, MoveOnly& m2)
  51 { m1.swap(m2); }
  52
  53 MoveOnly
  54 make_move_only (int i)
  55 { return MoveOnly(i); }
  56
  57 void test01()
  58 {
  59   std::tuple<> t1, t2;
  60   std::swap(t1, t2);
  61
  62   VERIFY( t1 == t2 );
  63 }
  64
  65 void test02()
  66 {
  67   std::tuple<int> t1(1), t2(2);
  68   std::swap(t1, t2);
  69
  70   VERIFY( std::get<0>(t1) == 2 && std::get<0>(t2) == 1 );
  71 }
  72
  73 void test03()
  74 {
  75   std::tuple<int, float> t1(1, 1.0f), t2(2, 2.0f);
  76   std::swap(t1, t2);
  77
  78   VERIFY( std::get<0>(t1) == 2 && std::get<0>(t2) == 1 );
  79   VERIFY( std::get<1>(t1) == 2.0f && std::get<1>(t2) == 1.0f );
  80 }
  81
  82 void test04()
  83 {
  84   std::tuple<int, float, MoveOnly>
  85     t1(1, 1.0f, make_move_only(1)),
  86     t2(2, 2.0f, make_move_only(2));
  87
  88   std::swap(t1, t2);
  89
  90   VERIFY( std::get<0>(t1) == 2 && std::get<0>(t2) == 1 );
  91   VERIFY( std::get<1>(t1) == 2.0f && std::get<1>(t2) == 1.0f );
  92   VERIFY( std::get<2>(t1) == make_move_only(2)
  93           && std::get<2>(t2) == make_move_only(1) );
  94 }
  95
  96 int main()
  97 {
  98   test01();
  99   test02();
 100   test03();
 101   test04();
 102   return 0;
 103 }