libstdc++-v3/testsuite/25_algorithms/is_permutation/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 <iterator>
  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::forward_iterator_wrapper;
  29 using __gnu_test::bidirectional_iterator_wrapper;
  30
  31 namespace ranges = std::ranges;
  32
  33 struct X { int i; };
  34
  35 void
  36 test01()
  37 {
  38   int x[] = { {2}, {2}, {6}, {8}, {10}, {11} };
  39   int y[] = { {2}, {6}, {8}, {10}, {11}, {2} };
  40   int z[] = { {2}, {6}, {8}, {10}, {2}, {2} };
  41
  42   VERIFY( ranges::is_permutation(x, x+6, y, y+6) );
  43   VERIFY( !ranges::is_permutation(x, x+6, y, y+5) );
  44
  45   test_container<int, forward_iterator_wrapper> cx(x), cy(y), cz(z);
  46   test_range<int, forward_iterator_wrapper> rx(x), ry(y), rz(z);
  47   VERIFY( ranges::is_permutation(cx, ry) );
  48   VERIFY( !ranges::is_permutation(rx, cz) );
  49   VERIFY( ranges::is_permutation(rx, cy) );
  50   VERIFY( !ranges::is_permutation(cx, rz) );
  51 }
  52
  53 void
  54 test02()
  55 {
  56   static constexpr X x[] = { {2}, {2}, {6}, {8}, {10}, {11} };
  57   static constexpr X y[] = { {2}, {6}, {8}, {10}, {11}, {2} };
  58   static constexpr int z[] = { {2}, {6}, {8}, {10}, {2}, {2} };
  59   static_assert(ranges::is_permutation(x, y, {}, &X::i, &X::i));
  60   static_assert(!ranges::is_permutation(x, z, {}, &X::i));
  61   static_assert(!ranges::is_permutation(z, y, {}, {}, &X::i));
  62 }
  63
  64 void
  65 test03()
  66 {
  67   int x[] = { 1, 2, 3, 4 };
  68   int y[] = { 1, 2, 3, 3 };
  69   test_container<int, bidirectional_iterator_wrapper> cx(x);
  70   do
  71     do
  72       {
  73         VERIFY( ranges::is_permutation(cx, x) );
  74         VERIFY( !ranges::is_permutation(y, cx) );
  75       } while (std::next_permutation(y, y+4));
  76   while (std::next_permutation(std::begin(cx), std::end(cx)));
  77 }
  78
  79 int
  80 main()
  81 {
  82   test01();
  83   test02();
  84   test03();
  85 }