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

   1 // Copyright (C) 2020-2022 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 <vector>
  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
  31 namespace ranges = std::ranges;
  32
  33 void
  34 test01()
  35 {
  36   int x[] = {1,2,3,4,5,6,7};
  37
  38     {
  39       const int y[] = {2,4,6};
  40       int w[7];
  41       test_range<int, input_iterator_wrapper> rx(x);
  42       test_range<int, output_iterator_wrapper> rw(w);
  43       auto [in,out] = ranges::copy_if(rx, rw.begin(),
  44                                       [] (int a) { return (a%2)==0; });
  45       VERIFY( in == rx.end() && out.ptr == w+3 );
  46       VERIFY( ranges::equal(w, w+3, y, y+3) );
  47     }
  48
  49     {
  50       const int y[] = {1,3,5,7};
  51       int w[7];
  52       test_range<int, input_iterator_wrapper> rx(x);
  53       test_range<int, output_iterator_wrapper> rw(w);
  54       auto [in,out] = ranges::copy_if(rx, rw.begin(),
  55                                       [] (int a) { return (a%2)==0; },
  56                                       [] (int a) { return a+1; });
  57       VERIFY( in == rx.end() && out.ptr == w+4 );
  58       VERIFY( ranges::equal(w, w+4, y, y+4) );
  59     }
  60 }
  61
  62 constexpr bool
  63 test02()
  64 {
  65   int x[] = {1,2,3};
  66   const int y[] = {1,3};
  67   int w[3];
  68   auto [in,out] = ranges::copy_if(x, w, [] (int a) { return (a%2)==1; });
  69   return ranges::equal(w, out, y, y+2);
  70 }
  71
  72 int
  73 main()
  74 {
  75   test01();
  76   static_assert(test02());
  77 }