libstdc++-v3/testsuite/25_algorithms/count/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 <testsuite_hooks.h>
  22 #include <testsuite_iterators.h>
  23
  24 using __gnu_test::test_container;
  25 using __gnu_test::test_range;
  26 using __gnu_test::input_iterator_wrapper;
  27 using __gnu_test::forward_iterator_wrapper;
  28
  29 namespace ranges = std::ranges;
  30
  31 struct X { int i; };
  32
  33 void
  34 test01()
  35 {
  36   X x[] = { {2}, {2}, {6}, {8}, {10}, {11}, {2} };
  37   auto res = ranges::count(x, x+7, 2, &X::i);
  38   VERIFY( res == 3 );
  39   res = ranges::count(x, x+7, 8, &X::i);
  40   VERIFY( res == 1 );
  41   res = ranges::count(x, x+7, 9, &X::i);
  42   VERIFY( res == 0 );
  43
  44   test_container<X, forward_iterator_wrapper> c(x);
  45   res = ranges::count(c, 6, &X::i);
  46   VERIFY( res == 1 );
  47   res = ranges::count(c, 9, &X::i);
  48   VERIFY( res == 0 );
  49
  50   test_range<X, input_iterator_wrapper> r(x);
  51   res = ranges::count(r, 2, &X::i);
  52   VERIFY( res == 3 );
  53
  54   r.bounds.first = x;
  55   res = ranges::count(r, 9, &X::i);
  56   VERIFY( res == 0 );
  57 }
  58
  59 struct Y { int i; int j; };
  60
  61 void
  62 test02()
  63 {
  64   static constexpr Y y[] = { {1,2}, {2,4}, {3,6}, {1,6} };
  65   static_assert(ranges::count(y, 6, &Y::j) == 2);
  66   static_assert(ranges::count(y, 5, &Y::j) == 0);
  67 }
  68
  69 int
  70 main()
  71 {
  72   test01();
  73   test02();
  74 }