libstdc++-v3/testsuite/25_algorithms/generate_n/1.cc

   1 // Copyright (C) 2017-2025 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 #include <algorithm>
  19 #include <testsuite_hooks.h>
  20 #include <testsuite_iterators.h>
  21
  22 struct Inc
  23 {
  24   int operator()() { return ++i; }
  25
  26   int i;
  27 };
  28
  29 void
  30 test01()
  31 {
  32   const int N = 3;
  33   int array[N];
  34
  35   using __gnu_test::test_container;
  36   using __gnu_test::output_iterator_wrapper;
  37   test_container<int, output_iterator_wrapper> c(array, array + N);
  38   std::generate_n(c.begin(), N, Inc());
  39   VERIFY(array[0] == 1);
  40   VERIFY(array[1] == 2);
  41   VERIFY(array[2] == 3);
  42 }
  43
  44 int main()
  45 {
  46   test01();
  47 }