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

   1 // Copyright (C) 2020-2023 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 <functional>
  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 using __gnu_test::forward_iterator_wrapper;
  31
  32 namespace ranges = std::ranges;
  33
  34 void
  35 test01()
  36 {
  37   int x[] = {4,2,1,1,0};
  38   int y[] = {3,2,1};
  39   int z[6];
  40   test_range<int, input_iterator_wrapper> rx(x), ry(y);
  41   test_range<int, output_iterator_wrapper> rz(z);
  42   auto [in1,in2,out]
  43     = ranges::set_union(rx, ry, rz.begin(),
  44                         ranges::greater{});
  45   VERIFY( in1.ptr == x+5 );
  46   VERIFY( in2.ptr == y+3 );
  47   VERIFY( out.ptr == z+6 );
  48   VERIFY( ranges::equal(z, (int[]){4,3,2,1,1,0}) );
  49 }
  50
  51 void
  52 test02()
  53 {
  54   int x[] = {4,2,1,1,0};
  55   int y[] = {3,2,1,1,0};
  56   int z[6];
  57   test_container<int, forward_iterator_wrapper> rx(x), ry(y);
  58   test_container<int, forward_iterator_wrapper> rz(z);
  59   auto [in1,in2,out]
  60     = ranges::set_union(rx.begin(), rx.end(),
  61                         ry.begin(), ry.end(),
  62                         rz.begin(),
  63                         {},
  64                         std::negate<>{},
  65                         std::negate<>{});
  66   VERIFY( in1.ptr == x+5 );
  67   VERIFY( in2.ptr == y+5 );
  68   VERIFY( out.ptr == z+6 );
  69   VERIFY( ranges::equal(z, (int[]){4,3,2,1,1,0}) );
  70 }
  71
  72 constexpr bool
  73 test03()
  74 {
  75   bool ok = true;
  76   int x[1] = {0};
  77   int y[1] = {1};
  78   int z[1];
  79   ranges::set_union(x, x, y, y+1, z);
  80   ok &= z[0] == 1;
  81   ranges::set_union(x, x+1, y, y, z);
  82   ok &= z[0] == 0;
  83   return ok;
  84 }
  85
  86 int
  87 main()
  88 {
  89   test01();
  90   test02();
  91   static_assert(test03());
  92 }