libstdc++-v3/testsuite/23_containers/multiset/modifiers/swap/1.cc

   1 // Copyright (C) 2004-2020 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 #include <set>
  19 #include <testsuite_hooks.h>
  20
  21 #if __cplusplus >= 201103L
  22 # define NOTHROW noexcept
  23 #else
  24 # define NOTHROW
  25 #endif
  26
  27 struct T { int i; };
  28
  29 // T must be LessThanComparable to pass concept-checks
  30 bool operator<(T l, T r) { return l.i < r.i; }
  31
  32 int swap_calls;
  33
  34 namespace std
  35 {
  36   template<>
  37     void
  38     multiset<T>::swap(multiset<T>&) NOTHROW
  39     { ++swap_calls; }
  40 }
  41
  42 // Should use multiset specialization for swap.
  43 void test01()
  44 {
  45   std::multiset<T> A;
  46   std::multiset<T> B;
  47   swap_calls = 0;
  48   std::swap(A, B);
  49   VERIFY(1 == swap_calls);
  50 }
  51
  52 // Should use multiset specialization for swap.
  53 void test02()
  54 {
  55   using namespace std;
  56   multiset<T> A;
  57   multiset<T> B;
  58   swap_calls = 0;
  59   swap(A, B);
  60   VERIFY(1 == swap_calls);
  61 }
  62
  63 // See c++/13658 for background info.
  64 int main()
  65 {
  66   test01();
  67   test02();
  68   return 0;
  69 }