libstdc++-v3/testsuite/std/ranges/subrange/tuple_like.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
  23 using S1 = std::ranges::subrange<int*>;
  24 using S2 = std::ranges::subrange<long*, void*>;
  25
  26 static_assert( std::tuple_size_v<S1> == 2 );
  27 static_assert( std::tuple_size_v<S2> == 2 );
  28
  29 static_assert( std::same_as<std::tuple_element_t<0, S1>, int*> );
  30 static_assert( std::same_as<std::tuple_element_t<1, S1>, int*> );
  31 // LWG 3398
  32 static_assert( std::same_as<std::tuple_element_t<0, const S1>, int*> );
  33 static_assert( std::same_as<std::tuple_element_t<1, const S1>, int*> );
  34
  35 static_assert( std::same_as<std::tuple_element_t<0, S2>, long*> );
  36 static_assert( std::same_as<std::tuple_element_t<1, S2>, void*> );
  37 // LWG 3398
  38 static_assert( std::same_as<std::tuple_element_t<0, const S2>, long*> );
  39 static_assert( std::same_as<std::tuple_element_t<1, const S2>, void*> );
  40
  41 S1 s1;
  42 static_assert( std::same_as<decltype(std::get<0>(s1)), int*> );
  43 static_assert( std::same_as<decltype(std::get<1>(s1)), int*> );
  44 const S1 c1;
  45 static_assert( std::same_as<decltype(std::get<0>(c1)), int*> );
  46 static_assert( std::same_as<decltype(std::get<1>(c1)), int*> );
  47 S2 s2;
  48 static_assert( std::same_as<decltype(std::get<0>(s2)), long*> );
  49 static_assert( std::same_as<decltype(std::get<1>(s2)), void*> );
  50 const S2 c2;
  51 static_assert( std::same_as<decltype(std::get<0>(c2)), long*> );
  52 static_assert( std::same_as<decltype(std::get<1>(c2)), void*> );