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

   1 // Copyright (C) 2020-2021 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 <testsuite_hooks.h>
  23 #include <testsuite_iterators.h>
  24
  25 using __gnu_test::test_container;
  26 using __gnu_test::test_range;
  27 using __gnu_test::input_iterator_wrapper;
  28 using __gnu_test::output_iterator_wrapper;
  29 using __gnu_test::forward_iterator_wrapper;
  30
  31 namespace ranges = std::ranges;
  32
  33 void
  34 test01()
  35 {
  36   int x[] = {4,2,1,1,0};
  37   int y[] = {3,2,1};
  38   int z[3];
  39   test_range<int, input_iterator_wrapper> rx(x), ry(y);
  40   test_range<int, output_iterator_wrapper> rz(z);
  41   auto [in,out]
  42     = ranges::set_difference(rx, ry, rz.begin(), ranges::greater{});
  43   VERIFY( in.ptr == x+5 );
  44   VERIFY( out.ptr == z+3 );
  45   VERIFY( ranges::equal(z, (int[]){4,1,0}) );
  46 }
  47
  48 void
  49 test02()
  50 {
  51   int x[] = {3,2,1,1,0};
  52   int y[] = {3,2,2,1,0};
  53   int z[1];
  54   test_container<int, forward_iterator_wrapper> rx(x), ry(y);
  55   test_container<int, forward_iterator_wrapper> rz(z);
  56   auto [in,out]
  57     = ranges::set_difference(rx.begin(), rx.end(),
  58                              ry.begin(), ry.end(),
  59                              rz.begin(),
  60                              {},
  61                              std::negate<>{},
  62                              std::negate<>{});
  63   VERIFY( in.ptr == x+5 );
  64   VERIFY( out.ptr == z+1 );
  65   VERIFY( ranges::equal(z, (int[]){1}) );
  66 }
  67
  68 constexpr bool
  69 test03()
  70 {
  71   bool ok = true;
  72   int x[1] = {0};
  73   int y[1] = {1};
  74   int z[1];
  75   ok &= ranges::set_difference(x, x, y, y+1, z).out == z;
  76   ok &= ranges::set_difference(x, x+1, y, y, z).out == z+1;
  77   ok &= z[0] == 0;
  78   return ok;
  79 }
  80
  81 int
  82 main()
  83 {
  84   test01();
  85   test02();
  86   static_assert(test03());
  87 }