libstdc++-v3/testsuite/25_algorithms/minmax/3.cc

   1 // { dg-do run { target c++11 } }
   2
   3 // 2008-09-16  Chris Fairles  <chris.fairles@gmail.com>
   4
   5 // Copyright (C) 2008-2017 Free Software Foundation, Inc.
   6 //
   7 // This file is part of the GNU ISO C++ Library.  This library is free
   8 // software; you can redistribute it and/or modify it under the
   9 // terms of the GNU General Public License as published by the
  10 // Free Software Foundation; either version 3, or (at your option)
  11 // any later version.
  12
  13 // This library is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // You should have received a copy of the GNU General Public License along
  19 // with this library; see the file COPYING3.  If not see
  20 // <http://www.gnu.org/licenses/>.
  21
  22 #include <algorithm>
  23 #include <functional>
  24 #include <testsuite_hooks.h>
  25
  26 struct compare_counter
  27   : std::binary_function<int, int, bool>
  28 {
  29   static int count;
  30
  31   bool operator()(int a, int b) const
  32   {
  33     ++count;
  34     return a < b;
  35   }
  36 };
  37
  38 int compare_counter::count = 0;
  39
  40 void test01()
  41 {
  42   std::minmax({1, 2, 3, 4, 5, 6, 7, 8}, compare_counter());
  43
  44   // If N is the number of arguments in the minmax function call,
  45   // 25.3.7 specifies that at most 3N/2 comparisons are allowed.
  46   VERIFY(compare_counter::count <= (3 * 8 / 2));
  47 }
  48
  49 int main()
  50 {
  51   test01();
  52   return 0;
  53 }