libstdc++-v3/testsuite/25_algorithms/copy_n/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 <vector>
  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::output_iterator_wrapper;
  29 using __gnu_test::random_access_iterator_wrapper;
  30
  31 namespace ranges = std::ranges;
  32
  33 template<template<typename> typename in_wrapper,
  34          template<typename> typename out_wrapper>
  35 void
  36 test01()
  37 {
  38   int x[] = {1,2,3,4,5,6,7};
  39   for (int i = -1; i <= 7; i++)
  40     {
  41       test_range<int, in_wrapper> rx(x);
  42       int w[7];
  43       test_range<int, out_wrapper> rw(w);
  44       ranges::copy_n(rx.begin(), i, rw.begin());
  45       if (i >= 0)
  46         VERIFY( ranges::equal(x, x+i, w, w+i) );
  47     }
  48 }
  49
  50 constexpr bool
  51 test02()
  52 {
  53   int x[] = {1,2,3};
  54   int y[2];
  55   auto [in,out] = ranges::copy_n(x, 2, y);
  56   return (in == x+2
  57           && out == y+2
  58           && ranges::equal(x, x+2, y, y+2));
  59 }
  60
  61 int
  62 main()
  63 {
  64   test01<input_iterator_wrapper,
  65          output_iterator_wrapper>();
  66   test01<random_access_iterator_wrapper,
  67          output_iterator_wrapper>();
  68   test01<random_access_iterator_wrapper,
  69          random_access_iterator_wrapper>();
  70   static_assert(test02());
  71 }