libstdc++-v3/testsuite/24_iterators/range_access/range_access_cpp20.cc

   1 // { dg-do compile { target c++20 } }
   2
   3 // Copyright (C) 2019-2024 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 // N4830 23.7, Range access [iterator.range]
  21
  22 #include <iterator>
  23
  24 void
  25 test01()
  26 {
  27   static int i[1];
  28   constexpr auto s = std::ssize(i);
  29   const std::ptrdiff_t* check_type = &s;
  30   static_assert(s == 1);
  31 }
  32
  33 void
  34 test02()
  35 {
  36   static int i[] = { 1, 2 };
  37   constexpr auto s = std::ssize(i);
  38   const std::ptrdiff_t* check_type = &s;
  39   static_assert(s == 2);
  40 }
  41
  42 void
  43 test03()
  44 {
  45   struct Cont
  46   {
  47     constexpr unsigned short size() const { return 3; }
  48   };
  49   constexpr Cont c;
  50   constexpr auto s = std::ssize(c);
  51   const std::ptrdiff_t* check_type = &s;
  52   static_assert(s == 3);
  53 }
  54
  55 void
  56 test04()
  57 {
  58   struct Cont
  59   {
  60     constexpr unsigned long long size() const { return 4; }
  61   };
  62   constexpr Cont c;
  63   constexpr auto s = std::ssize(c);
  64   const long long* check_type = &s;
  65   static_assert(s == 4);
  66 }