libstdc++-v3/testsuite/20_util/shared_ptr/comparison/86537.cc

   1 // Copyright (C) 2018-2024 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-do run { target c++11 } }
  19 // { dg-require-effective-target hosted }
  20
  21 #include <memory>
  22 #include <testsuite_hooks.h>
  23
  24 struct Should_not_happen { };
  25
  26 struct X { };
  27
  28 namespace std {
  29   template<> struct less<X*> {
  30     bool operator()(X*, X*) const { throw Should_not_happen(); }
  31   };
  32 }
  33
  34 bool custom_op_called = false;
  35
  36 bool
  37 operator<(const std::shared_ptr<X>&, const std::shared_ptr<X>&)
  38 {
  39   custom_op_called = true;
  40   return false;
  41 }
  42
  43 void
  44 test01()
  45 {
  46   const std::shared_ptr<X> sp;
  47   bool b = sp < sp;
  48   VERIFY( !b );
  49   VERIFY( custom_op_called );
  50
  51   std::less<std::shared_ptr<X>> lt;
  52   custom_op_called = false;
  53   b = lt(sp, sp);
  54   VERIFY( !b );
  55   VERIFY( custom_op_called ); // PR libstdc++/86537 and LWG DR 1262
  56
  57 #if __cplusplus >= 201402L
  58   std::less<> ltv;
  59   custom_op_called = false;
  60   b = ltv(sp, sp);
  61   VERIFY( !b );
  62   VERIFY( custom_op_called );
  63 #endif
  64 }
  65
  66 int
  67 main()
  68 {
  69   test01();
  70 }