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

   1 // { dg-do run { target c++11 } }
   2
   3 // Copyright (C) 2008-2018 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 // 20.8.13.2 Template class shared_ptr [util.smartptr.shared]
  21
  22 #include <memory>
  23 #include <testsuite_hooks.h>
  24
  25 struct A { };
  26
  27 namespace std
  28 {
  29   template<>
  30     struct less<A*> : binary_function<A*,A*,bool>
  31     {
  32       static int count;
  33       bool operator()(A* l, A* r) { ++count; return l < r; }
  34     };
  35   int less<A*>::count = 0;
  36 }
  37
  38 // 20.8.13.2.7 shared_ptr comparison [util.smartptr.shared.cmp]
  39
  40
  41 int
  42 test01()
  43 {
  44   std::less<std::shared_ptr<A>> less;
  45   // test empty shared_ptrs compare equivalent
  46   std::shared_ptr<A> p1;
  47   std::shared_ptr<A> p2;
  48   VERIFY( !less(p1, p2) && !less(p2, p1) );
  49   VERIFY( std::less<A*>::count == 2 );
  50   return 0;
  51 }
  52
  53
  54 // Construction from pointer
  55 int
  56 test02()
  57 {
  58   std::less<std::shared_ptr<A>> less;
  59
  60   std::shared_ptr<A> empty;
  61   std::shared_ptr<A> p1(new A);
  62   std::shared_ptr<A> p2(new A);
  63
  64   VERIFY( less(p1, p2) || less(p2, p1) );
  65   VERIFY( !(less(p1, p2) && less(p2, p1)) );
  66
  67   p1.reset();
  68   VERIFY( !less(p1, empty) && !less(empty, p1) );
  69
  70   p2.reset();
  71   VERIFY( !less(p1, p2) && !less(p2, p1) );
  72
  73   return 0;
  74 }
  75
  76 // Aliasing
  77 int
  78 test03()
  79 {
  80   std::less<std::shared_ptr<A>> less;
  81
  82   A a;
  83   std::shared_ptr<A> p1(new A);
  84   std::shared_ptr<A> p2(p1, &a);
  85   VERIFY( less(p1, p2) || less(p2, p1) );
  86
  87   return 0;
  88 }
  89 int
  90 main()
  91 {
  92   test01();
  93   test02();
  94   test03();
  95   return 0;
  96 }