libstdc++-v3/testsuite/std/ranges/sized.cc

   1 // Copyright (C) 2019-2020 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 <testsuite_iterators.h>
  23
  24 static_assert( std::ranges::sized_range<int(&)[1]> );
  25 static_assert( std::ranges::sized_range<const int(&)[1]> );
  26 static_assert( std::ranges::sized_range<int[1]> );
  27 static_assert( !std::ranges::sized_range<int*> );
  28
  29 using namespace __gnu_test;
  30
  31 // ranges::size(r) uses (end(r) - begin(r))
  32 static_assert( std::ranges::sized_range<test_contiguous_range<int>> );
  33 static_assert( std::ranges::sized_range<test_contiguous_range<int>&> );
  34 static_assert( std::ranges::sized_range<test_random_access_range<int>> );
  35 static_assert( std::ranges::sized_range<test_random_access_range<int>&> );
  36 // ranges::size(r) is invalid, (end(r) - begin(r)) requires sized sentinel
  37 static_assert(!std::ranges::sized_range<test_bidirectional_range<int>> );
  38 static_assert(!std::ranges::sized_range<test_bidirectional_range<int>&> );
  39 static_assert(!std::ranges::sized_range<test_forward_range<int>> );
  40 static_assert(!std::ranges::sized_range<test_forward_range<int>&> );
  41 static_assert(!std::ranges::sized_range<test_input_range<int>> );
  42 static_assert(!std::ranges::sized_range<test_input_range<int>&> );
  43 static_assert(!std::ranges::sized_range<test_output_range<int>> );
  44 static_assert(!std::ranges::sized_range<test_output_range<int>&> );
  45
  46 // ranges::size(r) uses r.size()
  47 static_assert( std::ranges::sized_range<test_contiguous_sized_range<int>> );
  48 static_assert( std::ranges::sized_range<test_contiguous_sized_range<int>&> );
  49 static_assert( std::ranges::sized_range<test_random_access_sized_range<int>> );
  50 static_assert( std::ranges::sized_range<test_random_access_sized_range<int>&> );
  51 static_assert( std::ranges::sized_range<test_bidirectional_sized_range<int>> );
  52 static_assert( std::ranges::sized_range<test_bidirectional_sized_range<int>&> );
  53 static_assert( std::ranges::sized_range<test_forward_sized_range<int>> );
  54 static_assert( std::ranges::sized_range<test_forward_sized_range<int>&> );
  55 static_assert( std::ranges::sized_range<test_input_sized_range<int>> );
  56 static_assert( std::ranges::sized_range<test_input_sized_range<int>&> );
  57 static_assert( std::ranges::sized_range<test_output_sized_range<int>> );
  58 static_assert( std::ranges::sized_range<test_output_sized_range<int>&> );
  59
  60 using long_range = __gnu_test::test_random_access_sized_range<long>;
  61 template<> constexpr bool std::ranges::disable_sized_range<long_range> = true;
  62
  63 // Despite being disabled, this is still a sized_range because ranges::size(r)
  64 // works, by using (ranges::end(r) - ranges::begin(r)).
  65 static_assert( std::ranges::sized_range<long_range> );
  66 static_assert( std::ranges::sized_range<long_range&> );
  67
  68 using short_range = __gnu_test::test_bidirectional_sized_range<short>;
  69 template<> constexpr bool std::ranges::disable_sized_range<short_range> = true;
  70
  71 // This is not a sized range because ranges::size(r) cannot use member size,
  72 // or ADL size, and (ranges::end(r) - ranges::begin(r)) is ill-formed for
  73 // bidirectional iterators.
  74 static_assert( !std::ranges::sized_range<short_range> );
  75 static_assert( !std::ranges::sized_range<short_range&> );