libstdc++-v3/testsuite/std/ranges/subrange/sizeof.cc

   1 // Copyright (C) 2020-2024 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 compile { target c++20 } }
  19
  20 #include <iterator>
  21 #include <ranges>
  22
  23 // Verify we optimize away the 'end' data member of a subrange with an empty
  24 // sentinel type.
  25 static_assert(sizeof(std::ranges::subrange<std::counted_iterator<int*>,
  26                                            std::default_sentinel_t>)
  27               == sizeof(std::counted_iterator<int*>));