libstdc++-v3/testsuite/25_algorithms/clamp/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
  29 namespace ranges = std::ranges;
  30
  31 struct X
  32 {
  33   int i, j;
  34 };
  35
  36 void
  37 test01()
  38 {
  39   VERIFY( ranges::clamp(1, 2, 4) == 2 );
  40   VERIFY( ranges::clamp(3, 2, 4) == 3 );
  41   VERIFY( ranges::clamp(5, 2, 4) == 4 );
  42
  43   VERIFY( ranges::clamp(1, 4, 2, ranges::greater{}) == 2 );
  44   VERIFY( ranges::clamp(3, 4, 2, ranges::greater{}) == 3 );
  45   VERIFY( ranges::clamp(5, 4, 2, ranges::greater{}) == 4 );
  46
  47   VERIFY( ranges::clamp(1, 2, 4, ranges::greater{}, std::negate<>{}) == 2 );
  48   VERIFY( ranges::clamp(3, 2, 4, ranges::greater{}, std::negate<>{}) == 3 );
  49   VERIFY( ranges::clamp(5, 2, 4, ranges::greater{}, std::negate<>{}) == 4 );
  50
  51   static_assert(ranges::clamp(X{1,2}, X{1,3}, X{1,4}, {}, &X::i).j == 2);
  52 }
  53
  54 int
  55 main()
  56 {
  57   test01();
  58 }