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

   1 // { dg-options "-std=gnu++0x" }
   2
   3 // 2008-09-16  Chris Fairles  <chris.fairles@gmail.com>
   4
   5 // Copyright (C) 2008 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 2, 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 COPYING.  If not, write to the Free
  20 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  21 // USA.
  22
  23 #include <algorithm>
  24 #include <functional>
  25 #include <testsuite_hooks.h>
  26
  27 struct compare_counter
  28   : std::binary_function<int, int, bool>
  29 {
  30   static int count;
  31
  32   bool operator()(int a, int b) const
  33   {
  34     ++count;
  35     return a < b;
  36   }
  37 };
  38
  39 int compare_counter::count = 0;
  40
  41 void test01()
  42 {
  43   bool test __attribute__((unused)) = true;
  44
  45   std::pair<const int&, const int&> z = std::minmax({1, 2, 3, 4, 5, 6, 7, 8},
  46                                                     compare_counter());
  47
  48   // If N is the number of arguments in the minmax function call,
  49   // 25.3.7 specifies that at most 3N/2 comparisons are allowed.
  50   VERIFY(compare_counter::count <= (3 * 8 / 2));
  51 }
  52
  53 int main()
  54 {
  55   test01();
  56   return 0;
  57 }