libstdc++-v3/testsuite/23_containers/list/operations/4.h

   1 // Copyright (C) 2001-2024 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 // 23.2.2.4 list operations [lib.list.ops]
  19
  20 #include <testsuite_hooks.h>
  21
  22 // A comparison predicate to order by rightmost digit.  Tracks call
  23 // counts for performance checks.
  24 struct CompLastLt
  25 {
  26   bool operator()(const int x, const int y)
  27   { ++itsCount; return x % 10 < y % 10; }
  28   static int count() { return itsCount; }
  29   static void reset() { itsCount = 0; }
  30   static int itsCount;
  31 };
  32
  33 int CompLastLt::itsCount;
  34
  35 struct CompLastEq
  36 {
  37   bool operator()(const int x, const int y)
  38   { ++itsCount; return x % 10 == y % 10; }
  39   static int count() { return itsCount; }
  40   static void reset() { itsCount = 0; }
  41   static int itsCount;
  42 };
  43
  44 int CompLastEq::itsCount;
  45
  46 // sort(pred) + merge(pred) + unique(pred)
  47 // also checks performance requirements
  48 template<typename _Tp>
  49 void
  50 operations04()
  51 {
  52   typedef _Tp list_type;
  53
  54   const int A[] = {1, 2, 3, 4, 5, 6};
  55   const int B[] = {12, 15, 13, 14, 11};
  56   const int C[] = {11, 12, 13, 14, 15};
  57   const int D[] = {1, 11, 2, 12, 3, 13, 4, 14, 5, 15, 6};
  58   const int N = sizeof(A) / sizeof(int);
  59   const int M = sizeof(B) / sizeof(int);
  60   const int Q = sizeof(D) / sizeof(int);
  61
  62   list_type list0401(A, A + N);
  63   list_type list0402(B, B + M);
  64   list_type list0403(C, C + M);
  65   list_type list0404(D, D + Q);
  66   list_type list0405(A, A + N);
  67
  68   // sort B
  69   CompLastLt lt;
  70
  71   CompLastLt::reset();
  72   list0402.sort(lt);
  73   VERIFY(list0402 == list0403);
  74
  75   CompLastLt::reset();
  76   list0401.merge(list0402, lt);
  77   VERIFY(list0401 == list0404);
  78 #ifndef _GLIBCXX_DEBUG
  79   VERIFY(lt.count() <= (N + M - 1));
  80 #endif
  81
  82   CompLastEq eq;
  83
  84   CompLastEq::reset();
  85   list0401.unique(eq);
  86   VERIFY(list0401 == list0405);
  87 #ifndef _GLIBCXX_DEBUG
  88   VERIFY(eq.count() == (N + M - 1));
  89 #endif
  90 }
  91