libstdc++-v3/testsuite/25_algorithms/mismatch/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 xa[] = { {1}, {2}, {3}, {4}, {5}, {6} };
  37   X xb[] = { {1}, {2}, {3}, {3}, {5}, {6} };
  38   auto res = ranges::mismatch(xa, xa+6, xb, xb+6, {}, &X::i, &X::i);
  39   VERIFY( res.in1 == xa+3 && res.in2 == xb+3 );
  40
  41   test_container<X, forward_iterator_wrapper> ca(xa);
  42   test_container<X, forward_iterator_wrapper> cb(xb);
  43   auto res2 = ranges::mismatch(ca, cb, {}, &X::i, &X::i);
  44   VERIFY( res2.in1->i == 4 && res2.in2->i == 3 );
  45   res2 = ranges::mismatch(ca, ca, {}, &X::i, &X::i);
  46   VERIFY( res2.in1 == ranges::end(ca) && res2.in2 == ranges::end(ca) );
  47
  48   test_range<X, input_iterator_wrapper> ra(xa);
  49   test_range<X, input_iterator_wrapper> rb(xb);
  50   auto res3 = ranges::mismatch(ra, rb, {}, &X::i, &X::i);
  51   VERIFY( res3.in1->i == 4 && res3.in2->i == 3 );
  52
  53   test_range<X, input_iterator_wrapper> ra2(xa);
  54   ra.bounds.first = xa;
  55   res3 = ranges::mismatch(ra, ra2, {}, &X::i, &X::i);
  56   VERIFY( res3.in1 == ranges::end(ra) && res3.in2 == ranges::end(ra2) );
  57 }
  58
  59 struct Y { int i; int j; };
  60
  61 void
  62 test02()
  63 {
  64   static constexpr Y ya[] = { {1,2}, {2,4}, {3,6}, {1,6} };
  65   static constexpr Y yb[] = { {2,1}, {4,2}, {4,2}, {7,1} };
  66   static_assert(ranges::mismatch(ya, yb, {}, &Y::i, &Y::j).in1 == ya+2);
  67   static_assert(ranges::mismatch(ya, yb, {}, &Y::i, &Y::j).in2 == yb+2);
  68 }
  69
  70 int
  71 main()
  72 {
  73   test01();
  74   test02();
  75 }