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

   1 // { dg-options "-std=gnu++11" }
   2
   3 // Copyright (C) 2008-2016 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   bool test __attribute__((unused)) = true;
  45
  46   std::less<std::shared_ptr<A>> less;
  47   // test empty shared_ptrs compare equivalent
  48   std::shared_ptr<A> p1;
  49   std::shared_ptr<A> p2;
  50   VERIFY( !less(p1, p2) && !less(p2, p1) );
  51   VERIFY( std::less<A*>::count == 2 );
  52   return 0;
  53 }
  54
  55
  56 // Construction from pointer
  57 int
  58 test02()
  59 {
  60   bool test __attribute__((unused)) = true;
  61
  62   std::less<std::shared_ptr<A>> less;
  63
  64   std::shared_ptr<A> empty;
  65   std::shared_ptr<A> p1(new A);
  66   std::shared_ptr<A> p2(new A);
  67
  68   VERIFY( less(p1, p2) || less(p2, p1) );
  69   VERIFY( !(less(p1, p2) && less(p2, p1)) );
  70
  71   p1.reset();
  72   VERIFY( !less(p1, empty) && !less(empty, p1) );
  73
  74   p2.reset();
  75   VERIFY( !less(p1, p2) && !less(p2, p1) );
  76
  77   return 0;
  78 }
  79
  80 // Aliasing
  81 int
  82 test03()
  83 {
  84   bool test __attribute__((unused)) = true;
  85
  86   std::less<std::shared_ptr<A>> less;
  87
  88   A a;
  89   std::shared_ptr<A> p1(new A);
  90   std::shared_ptr<A> p2(p1, &a);
  91   VERIFY( less(p1, p2) || less(p2, p1) );
  92
  93   return 0;
  94 }
  95 int
  96 main()
  97 {
  98   test01();
  99   test02();
 100   test03();
 101   return 0;
 102 }