libstdc++-v3/testsuite/25_algorithms/heap/vectorbool.cc

   1 // Copyright (C) 2013-2025 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // 25.3.6 Heap operations [lib.alg.heap.operations]
  19
  20 #include <iterator>
  21 #include <vector>
  22 #include <algorithm>
  23 #include <testsuite_hooks.h>
  24
  25 const bool A[] = { true, true, false, true, false, false, true, false };
  26 const int B[] = { false, false, false, false, true, true, true, true };
  27 const int C[] = { true, true, true, true, false, false, false, false };
  28 const int N = sizeof(A) / sizeof(bool);
  29
  30 // This functor has the equivalent functionality of std::greater<>,
  31 // but there is no dependency on <functional> and it also tracks the
  32 // number of invocations since creation.
  33 class Gt
  34 {
  35 public:
  36   static int count() { return _S_count; }
  37   static void reset() { _S_count = 0; }
  38
  39   bool
  40   operator()(bool x, bool y) const
  41   {
  42     ++_S_count;
  43     return x > y;
  44   }
  45
  46 private:
  47   static int _S_count;
  48 };
  49
  50 int Gt::_S_count = 0;
  51
  52 // Exercise all of the heap functions for operator<.  The intermediate
  53 // results between push_heap and pop_heap and make_heap and sort_heap
  54 // are not checked (they could be).
  55 void
  56 test01()
  57 {
  58   // sort array s1 using push_heap/pop_heap
  59   std::vector<bool> s1;
  60   std::copy(A, A + N, std::back_inserter(s1));
  61   VERIFY( std::equal(s1.begin(), s1.begin() + N, A) );
  62
  63   for (int i = 2; i <= N; ++i)
  64     std::push_heap(s1.begin(), s1.begin() + i);
  65
  66   for (int i = N; i >= 2; --i)
  67     std::pop_heap(s1.begin(), s1.begin() + i);
  68
  69   VERIFY( std::equal(s1.begin(), s1.begin() + N, B) );
  70
  71   // sort array s2 using make_heap/sort_heap
  72   std::vector<bool> s2;
  73   std::copy(A, A + N, std::back_inserter(s2));
  74   VERIFY( std::equal(s2.begin(), s2.begin() + N, A) );
  75
  76   std::make_heap(s2.begin(), s2.begin() + N);
  77   std::sort_heap(s2.begin(), s2.begin() + N);
  78   VERIFY( std::equal(s2.begin(), s2.begin() + N, B) );
  79 }
  80
  81 // Perform same tests as above but with the comparison predicate
  82 // versions, and add complexity constraint checks.
  83 void
  84 test02()
  85 {
  86   Gt gt;
  87
  88 #ifndef _GLIBCXX_DEBUG
  89   //const int logN = static_cast<int>(std::log(static_cast<double>(N)) + 0.5);
  90   const int logN = 3;
  91 #endif
  92
  93   std::vector<bool> s1;
  94   std::copy(A, A + N, std::back_inserter(s1));
  95   VERIFY(std::equal(s1.begin(), s1.begin() + N, A));
  96
  97   for (int i = 2; i <= N; ++i)
  98     {
  99       std::push_heap(s1.begin(), s1.begin() + i, gt);
 100 #ifndef _GLIBCXX_DEBUG
 101       VERIFY(gt.count() <= logN);
 102 #endif
 103       gt.reset();
 104     }
 105
 106   for (int i = N; i >= 2; --i)
 107     {
 108       std::pop_heap(s1.begin(), s1.begin() + i, gt);
 109 #ifndef _GLIBCXX_DEBUG
 110       VERIFY(gt.count() <= 2 * logN);
 111 #endif
 112       gt.reset();
 113     }
 114
 115   VERIFY(std::equal(s1.begin(), s1.begin() + N, C));
 116
 117   // sort array s2 using make_heap/sort_heap
 118   std::vector<bool> s2;
 119   std::copy(A, A + N, std::back_inserter(s2));
 120   VERIFY(std::equal(s2.begin(), s2.begin() + N, A));
 121
 122   std::make_heap(s2.begin(), s2.begin() + N, gt);
 123 #ifndef _GLIBCXX_DEBUG
 124   VERIFY(gt.count() <= 3 * N);
 125 #endif
 126   gt.reset();
 127
 128   std::sort_heap(s2.begin(), s2.begin() + N, gt);
 129 #ifndef _GLIBCXX_DEBUG
 130   VERIFY(gt.count() <= N * logN);
 131 #endif
 132
 133   VERIFY(std::equal(s2.begin(), s2.begin() + N, C));
 134 }
 135
 136 int
 137 main()
 138 {
 139   test01();
 140   test02();
 141   return 0;
 142 }