libstdc++-v3/testsuite/20_util/owner_less/cmp.cc

   1 // { dg-options "-std=gnu++0x" }
   2
   3 // Copyright (C) 2008, 2009 Free Software Foundation
   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 // 20.8.13.4 Template class owner_less [util.smartptr.ownerless]
  21
  22 #include <memory>
  23 #include <algorithm>
  24 #include <testsuite_hooks.h>
  25
  26 struct A { };
  27
  28 struct B { A a[2]; };
  29
  30 // 20.8.13.4 Template class owner_less [util.smartptr.ownerless]
  31
  32 int
  33 test01()
  34 {
  35   bool test __attribute__((unused)) = true;
  36
  37   // test empty shared_ptrs compare equivalent
  38   std::owner_less<std::shared_ptr<A>> less;
  39   std::owner_less<std::weak_ptr<A>> wless;
  40   std::shared_ptr<A> p1;
  41   std::shared_ptr<A> p2;
  42   VERIFY( !less(p1, p2) && !less(p2, p1) );
  43   std::weak_ptr<A> p3;
  44   VERIFY( !less(p1, p3) && !less(p3, p1) );
  45   VERIFY( !wless(p1, p3) && !wless(p3, p1) );
  46   return 0;
  47 }
  48
  49
  50 // Construction from pointer
  51 int
  52 test02()
  53 {
  54   bool test __attribute__((unused)) = true;
  55
  56   std::owner_less<std::shared_ptr<A>> less;
  57   std::owner_less<std::weak_ptr<A>> wless;
  58
  59   std::shared_ptr<A> empty;
  60
  61   std::shared_ptr<A> a1(new A);
  62   VERIFY( less(empty, a1) || less(a1, empty) );
  63
  64   std::shared_ptr<A> a2(new A);
  65   VERIFY( less(a1, a2) || less(a2, a1) );
  66
  67   std::weak_ptr<A> w1(a1);
  68   VERIFY( !less(a1, w1) && !less(w1, a1) );
  69
  70   std::weak_ptr<A> w2(a2);
  71   VERIFY( wless(w1, w2) || wless(w2, w1) );
  72
  73   a1.reset();
  74   VERIFY( !less(empty, a1) && !less(a1, empty) );
  75   VERIFY( less(a1, w1) || less(w1, a1) );
  76
  77   a2.reset();
  78   VERIFY( !less(a2, a1) && !less(a1, a2) );
  79
  80   return 0;
  81 }
  82
  83 // aliasing
  84 int
  85 test03()
  86 {
  87   bool test __attribute__((unused)) = true;
  88
  89   std::owner_less<std::shared_ptr<A>> less;
  90   std::owner_less<std::weak_ptr<A>> wless;
  91
  92   std::shared_ptr<B> b(new B);
  93   std::shared_ptr<A> a0(b, &b->a[0]);
  94   std::shared_ptr<A> a1(b, &b->a[1]);
  95   // values are different but owners are equivalent:
  96   VERIFY( a0 < a1 && !less(a0, a1) && !less(a1, a0) );
  97
  98   std::weak_ptr<A> w0(a0);
  99   std::weak_ptr<A> w1(a1);
 100   VERIFY( !wless(w0, w1) && !wless(w1, w0) );
 101   VERIFY( !less(a0, w1) && !less(w1, a0) );
 102   VERIFY( !wless(w0, a1) && !wless(a1, w0) );
 103
 104   return 0;
 105 }
 106
 107 // strict weak ordering
 108 int
 109 test04()
 110 {
 111   bool test __attribute__((unused)) = true;
 112
 113   std::owner_less<std::shared_ptr<A>> less;
 114
 115   std::shared_ptr<A> a[3];
 116   a[0].reset(new A);
 117   a[1].reset(new A);
 118   a[2].reset(new A);
 119   std::sort(a, a+3, less);
 120   VERIFY( !less(a[0], a[0]) );
 121   VERIFY( less(a[0], a[1]) && !less(a[1], a[0]) );
 122   VERIFY( less(a[0], a[1]) && less(a[1], a[2]) && less(a[0], a[2]) );
 123
 124   return 0;
 125 }
 126
 127 int
 128 main()
 129 {
 130   test01();
 131   test02();
 132   test03();
 133   test04();
 134   return 0;
 135 }