libstdc++-v3/testsuite/25_algorithms/partial_sort/random_test.cc

   1 // Copyright (C) 2013-2016 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 // { dg-options "-DSIMULATOR_TEST" { target simulator } }
  19 // { dg-do run { target c++11 } }
  20 // { dg-require-cstdint "" }
  21
  22 // 25.4.1.3 [lib.alg.partial.sort]
  23
  24 #include <algorithm>
  25 #include <random>
  26 #include <testsuite_hooks.h>
  27 #include <testsuite_iterators.h>
  28 #include <testsuite_containergen.h>
  29
  30 using __gnu_test::test_container;
  31 using __gnu_test::random_access_iterator_wrapper;
  32
  33 typedef test_container<int, random_access_iterator_wrapper> Container;
  34
  35 struct testPartialSort
  36 {
  37   template<typename Container, typename RandomGen>
  38   void operator()(Container con, RandomGen& rg)
  39   {
  40     const int size = con.end() - con.begin();
  41     auto dist = std::uniform_int_distribution<>(0, size);
  42     const int element = dist(rg);
  43
  44     std::partial_sort(con.begin(), con.begin() + element, con.end());
  45
  46     VERIFY( std::is_sorted(con.begin(), con.begin() + element) );
  47
  48     if (element > 0)
  49       {
  50         for (int i = element; i < size; ++i)
  51           VERIFY( con.val(element - 1) <= con.val(i) );
  52       }
  53   }
  54 };
  55
  56 int
  57 main()
  58 {
  59   __gnu_test::test_containers<Container>(testPartialSort());
  60 }