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

   1 // { dg-do run { target c++11 } }
   2 // { dg-require-effective-target hosted }
   3
   4 // Copyright (C) 2008-2024 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 // 20.8.13.4 Template class owner_less [util.smartptr.ownerless]
  22
  23 #include <memory>
  24 #include <algorithm>
  25 #include <testsuite_hooks.h>
  26
  27 struct A { };
  28
  29 struct B { A a[2]; };
  30
  31 // 20.8.13.4 Template class owner_less [util.smartptr.ownerless]
  32
  33 int
  34 test01()
  35 {
  36   // test empty shared_ptrs compare equivalent
  37   std::owner_less<std::shared_ptr<A>> less;
  38   std::owner_less<std::weak_ptr<A>> wless;
  39   std::shared_ptr<A> p1;
  40   std::shared_ptr<A> p2;
  41   VERIFY( !less(p1, p2) && !less(p2, p1) );
  42   std::weak_ptr<A> p3;
  43   VERIFY( !less(p1, p3) && !less(p3, p1) );
  44   VERIFY( !wless(p1, p3) && !wless(p3, p1) );
  45   return 0;
  46 }
  47
  48
  49 // Construction from pointer
  50 int
  51 test02()
  52 {
  53   std::owner_less<std::shared_ptr<A>> less;
  54   std::owner_less<std::weak_ptr<A>> wless;
  55
  56   std::shared_ptr<A> empty;
  57
  58   std::shared_ptr<A> a1(new A);
  59   VERIFY( less(empty, a1) || less(a1, empty) );
  60
  61   std::shared_ptr<A> a2(new A);
  62   VERIFY( less(a1, a2) || less(a2, a1) );
  63
  64   std::weak_ptr<A> w1(a1);
  65   VERIFY( !less(a1, w1) && !less(w1, a1) );
  66
  67   std::weak_ptr<A> w2(a2);
  68   VERIFY( wless(w1, w2) || wless(w2, w1) );
  69
  70   a1.reset();
  71   VERIFY( !less(empty, a1) && !less(a1, empty) );
  72   VERIFY( less(a1, w1) || less(w1, a1) );
  73
  74   a2.reset();
  75   VERIFY( !less(a2, a1) && !less(a1, a2) );
  76
  77   return 0;
  78 }
  79
  80 // aliasing
  81 int
  82 test03()
  83 {
  84   std::owner_less<std::shared_ptr<A>> less;
  85   std::owner_less<std::weak_ptr<A>> wless;
  86
  87   std::shared_ptr<B> b(new B);
  88   std::shared_ptr<A> a0(b, &b->a[0]);
  89   std::shared_ptr<A> a1(b, &b->a[1]);
  90   // values are different but owners are equivalent:
  91   VERIFY( a0 < a1 && !less(a0, a1) && !less(a1, a0) );
  92
  93   std::weak_ptr<A> w0(a0);
  94   std::weak_ptr<A> w1(a1);
  95   VERIFY( !wless(w0, w1) && !wless(w1, w0) );
  96   VERIFY( !less(a0, w1) && !less(w1, a0) );
  97   VERIFY( !wless(w0, a1) && !wless(a1, w0) );
  98
  99   return 0;
 100 }
 101
 102 // strict weak ordering
 103 int
 104 test04()
 105 {
 106   std::owner_less<std::shared_ptr<A>> less;
 107
 108   std::shared_ptr<A> a[3];
 109   a[0].reset(new A);
 110   a[1].reset(new A);
 111   a[2].reset(new A);
 112   std::sort(a, a+3, less);
 113   VERIFY( !less(a[0], a[0]) );
 114   VERIFY( less(a[0], a[1]) && !less(a[1], a[0]) );
 115   VERIFY( less(a[0], a[1]) && less(a[1], a[2]) && less(a[0], a[2]) );
 116
 117   return 0;
 118 }
 119
 120 int
 121 main()
 122 {
 123   test01();
 124   test02();
 125   test03();
 126   test04();
 127   return 0;
 128 }