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

   1 // { dg-do run { target c++11 } }
   2
   3 // Copyright (C) 2008-2022 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 // 20.8.13.4 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   // test empty shared_ptrs compare equivalent
  36   std::owner_less<std::shared_ptr<A>> less;
  37   std::owner_less<std::weak_ptr<A>> wless;
  38   std::shared_ptr<A> p1;
  39   std::shared_ptr<A> p2;
  40   VERIFY( !less(p1, p2) && !less(p2, p1) );
  41   std::weak_ptr<A> p3;
  42   VERIFY( !less(p1, p3) && !less(p3, p1) );
  43   VERIFY( !wless(p1, p3) && !wless(p3, p1) );
  44   return 0;
  45 }
  46
  47
  48 // Construction from pointer
  49 int
  50 test02()
  51 {
  52   std::owner_less<std::shared_ptr<A>> less;
  53   std::owner_less<std::weak_ptr<A>> wless;
  54
  55   std::shared_ptr<A> empty;
  56
  57   std::shared_ptr<A> a1(new A);
  58   VERIFY( less(empty, a1) || less(a1, empty) );
  59
  60   std::shared_ptr<A> a2(new A);
  61   VERIFY( less(a1, a2) || less(a2, a1) );
  62
  63   std::weak_ptr<A> w1(a1);
  64   VERIFY( !less(a1, w1) && !less(w1, a1) );
  65
  66   std::weak_ptr<A> w2(a2);
  67   VERIFY( wless(w1, w2) || wless(w2, w1) );
  68
  69   a1.reset();
  70   VERIFY( !less(empty, a1) && !less(a1, empty) );
  71   VERIFY( less(a1, w1) || less(w1, a1) );
  72
  73   a2.reset();
  74   VERIFY( !less(a2, a1) && !less(a1, a2) );
  75
  76   return 0;
  77 }
  78
  79 // aliasing
  80 int
  81 test03()
  82 {
  83   std::owner_less<std::shared_ptr<A>> less;
  84   std::owner_less<std::weak_ptr<A>> wless;
  85
  86   std::shared_ptr<B> b(new B);
  87   std::shared_ptr<A> a0(b, &b->a[0]);
  88   std::shared_ptr<A> a1(b, &b->a[1]);
  89   // values are different but owners are equivalent:
  90   VERIFY( a0 < a1 && !less(a0, a1) && !less(a1, a0) );
  91
  92   std::weak_ptr<A> w0(a0);
  93   std::weak_ptr<A> w1(a1);
  94   VERIFY( !wless(w0, w1) && !wless(w1, w0) );
  95   VERIFY( !less(a0, w1) && !less(w1, a0) );
  96   VERIFY( !wless(w0, a1) && !wless(a1, w0) );
  97
  98   return 0;
  99 }
 100
 101 // strict weak ordering
 102 int
 103 test04()
 104 {
 105   std::owner_less<std::shared_ptr<A>> less;
 106
 107   std::shared_ptr<A> a[3];
 108   a[0].reset(new A);
 109   a[1].reset(new A);
 110   a[2].reset(new A);
 111   std::sort(a, a+3, less);
 112   VERIFY( !less(a[0], a[0]) );
 113   VERIFY( less(a[0], a[1]) && !less(a[1], a[0]) );
 114   VERIFY( less(a[0], a[1]) && less(a[1], a[2]) && less(a[0], a[2]) );
 115
 116   return 0;
 117 }
 118
 119 int
 120 main()
 121 {
 122   test01();
 123   test02();
 124   test03();
 125   test04();
 126   return 0;
 127 }