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

   1 // Copyright (C) 2020-2021 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 compile { target c++2a } }
  20
  21 #include <ranges>
  22 #include <string_view>
  23
  24 namespace ranges = std::ranges;
  25
  26 auto pred_f(int x) { return x%2 == 0; };
  27 auto pred_l = [] (int x) { return x%2 == 0; };
  28
  29 auto func_f(int x) { return x*x; }
  30 auto func_l = [] (int x) { return x*x; };
  31
  32 using V = ranges::subrange<int*, int*>;
  33 constexpr auto ptr = sizeof(int*);
  34 static_assert(sizeof(V) == 2*ptr);
  35
  36 static_assert(sizeof(ranges::take_view<V>) == 3*ptr);
  37 static_assert(sizeof(ranges::drop_view<V>) == 3*ptr);
  38
  39 static_assert(sizeof(ranges::filter_view<V, decltype(&pred_f)>) == 4*ptr);
  40 static_assert(sizeof(ranges::take_while_view<V, decltype(&pred_f)>) == 3*ptr);
  41 static_assert(sizeof(ranges::drop_while_view<V, decltype(&pred_f)>) == 4*ptr);
  42 static_assert(sizeof(ranges::transform_view<V, decltype(&func_f)>) == 3*ptr);
  43
  44 static_assert(sizeof(ranges::filter_view<V, decltype(pred_l)>) == 3*ptr);
  45 static_assert(sizeof(ranges::take_while_view<V, decltype(pred_l)>) == 3*ptr);
  46 static_assert(sizeof(ranges::drop_while_view<V, decltype(pred_l)>) == 3*ptr);
  47 static_assert(sizeof(ranges::transform_view<V, decltype(func_l)>) == 3*ptr);
  48
  49 static_assert(sizeof(ranges::split_view<V, std::string_view>) == 4*ptr);
  50
  51 static_assert
  52  (sizeof(ranges::reverse_view<ranges::filter_view<V, decltype(pred_l)>>) == 4*ptr);