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

   1 // Copyright (C) 2020-2025 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-do run { target c++20 } }
  19
  20 #include <algorithm>
  21 #include <functional>
  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[6];
  39   test_range<int, input_iterator_wrapper> rx(x), ry(y);
  40   test_range<int, output_iterator_wrapper> rz(z);
  41   auto [in1,in2,out]
  42     = ranges::set_union(rx, ry, rz.begin(),
  43                         ranges::greater{});
  44   VERIFY( in1.ptr == x+5 );
  45   VERIFY( in2.ptr == y+3 );
  46   VERIFY( out.ptr == z+6 );
  47   VERIFY( ranges::equal(z, (int[]){4,3,2,1,1,0}) );
  48 }
  49
  50 void
  51 test02()
  52 {
  53   int x[] = {4,2,1,1,0};
  54   int y[] = {3,2,1,1,0};
  55   int z[6];
  56   test_container<int, forward_iterator_wrapper> rx(x), ry(y);
  57   test_container<int, forward_iterator_wrapper> rz(z);
  58   auto [in1,in2,out]
  59     = ranges::set_union(rx.begin(), rx.end(),
  60                         ry.begin(), ry.end(),
  61                         rz.begin(),
  62                         {},
  63                         std::negate<>{},
  64                         std::negate<>{});
  65   VERIFY( in1.ptr == x+5 );
  66   VERIFY( in2.ptr == y+5 );
  67   VERIFY( out.ptr == z+6 );
  68   VERIFY( ranges::equal(z, (int[]){4,3,2,1,1,0}) );
  69 }
  70
  71 constexpr bool
  72 test03()
  73 {
  74   bool ok = true;
  75   int x[1] = {0};
  76   int y[1] = {1};
  77   int z[1];
  78   ranges::set_union(x, x, y, y+1, z);
  79   ok &= z[0] == 1;
  80   ranges::set_union(x, x+1, y, y, z);
  81   ok &= z[0] == 0;
  82   return ok;
  83 }
  84
  85 int
  86 main()
  87 {
  88   test01();
  89   test02();
  90   static_assert(test03());
  91 }