libstdc++-v3/testsuite/23_containers/set/cons/61023.cc

   1 // { dg-do run { target c++11 } }
   2
   3 // Copyright (C) 2014-2025 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 #include <set>
  21 #include <stdexcept>
  22
  23 struct Comparator
  24 {
  25   Comparator() : valid(false) { }
  26   explicit Comparator(bool) : valid(true) { }
  27
  28   bool operator()(int i, int j) const
  29   {
  30     if (!valid)
  31       throw std::logic_error("Comparator is invalid");
  32     return i < j;
  33   }
  34
  35 private:
  36   bool valid;
  37 };
  38
  39 int main()
  40 {
  41   using test_type = std::set<int, Comparator>;
  42
  43   Comparator cmp{true};
  44
  45   test_type good{cmp};
  46
  47   test_type s1;
  48   s1 = good;             // copy-assign
  49   s1.insert(1);
  50   s1.insert(2);
  51
  52   test_type s2;
  53   s2 = std::move(good);  // move-assign
  54   s2.insert(1);
  55   s2.insert(2);
  56 }