libstdc++-v3/testsuite/25_algorithms/merge/constrained.cc

   1 // Copyright (C) 2020-2022 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 "-std=gnu++2a" }
  19 // { dg-do run { target c++2a } }
  20
  21 #include <algorithm>
  22 #include <vector>
  23 #include <testsuite_hooks.h>
  24 #include <testsuite_iterators.h>
  25
  26 using __gnu_test::test_container;
  27 using __gnu_test::test_range;
  28 using __gnu_test::input_iterator_wrapper;
  29 using __gnu_test::output_iterator_wrapper;
  30
  31 namespace ranges = std::ranges;
  32
  33 void
  34 test01()
  35 {
  36   int x[] = {1,2,3,4,5};
  37   for (int i = 0; i <= 5; i++)
  38     for (int j = 0; j <= 5; j++)
  39       {
  40         int z[10];
  41         test_range<int, input_iterator_wrapper> rx(x, x+i), ry(x, x+j);
  42         test_range<int, output_iterator_wrapper> rz(z, z+i+j);
  43         auto [in1,in2,out] = ranges::merge(rx, ry, rz.begin());
  44         VERIFY( in1 == rx.end() );
  45         VERIFY( in2 == ry.end() );
  46         VERIFY( out == rz.end() );
  47
  48         std::vector<int> v(x, x+i);
  49         v.insert(v.end(), x, x+j);
  50         ranges::sort(v);
  51
  52         VERIFY( ranges::equal(v.begin(), v.end(), z, z+i+j) );
  53       }
  54 }
  55
  56 constexpr bool
  57 test02()
  58 {
  59   int x[] = {-1,-3,-5};
  60   int y[] = {2,4,6};
  61   int z[6];
  62   ranges::merge(x, x+3, y, y+3, z,
  63                 ranges::greater{}, {}, [] (int a) { return -a; });
  64
  65   const int w[6] = {-1, 2, -3, 4, -5, 6};
  66   return ranges::equal(w, z);
  67 }
  68
  69
  70 int
  71 main()
  72 {
  73   test01();
  74   static_assert(test02());
  75 }