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

   1 // { dg-options "-std=gnu++2a" }
   2 // { dg-do compile { target c++2a } }
   3
   4 // Copyright (C) 2019 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 // N4830 23.7, Range access [iterator.range]
  22
  23 #include <iterator>
  24
  25 void
  26 test01()
  27 {
  28   static int i[1];
  29   constexpr auto s = std::ssize(i);
  30   const std::ptrdiff_t* check_type = &s;
  31   static_assert(s == 1);
  32 }
  33
  34 void
  35 test02()
  36 {
  37   static int i[] = { 1, 2 };
  38   constexpr auto s = std::ssize(i);
  39   const std::ptrdiff_t* check_type = &s;
  40   static_assert(s == 2);
  41 }
  42
  43 void
  44 test03()
  45 {
  46   struct Cont
  47   {
  48     constexpr unsigned short size() const { return 3; }
  49   };
  50   constexpr Cont c;
  51   constexpr auto s = std::ssize(c);
  52   const std::ptrdiff_t* check_type = &s;
  53   static_assert(s == 3);
  54 }
  55
  56 void
  57 test04()
  58 {
  59   struct Cont
  60   {
  61     constexpr unsigned long long size() const { return 4; }
  62   };
  63   constexpr Cont c;
  64   constexpr auto s = std::ssize(c);
  65   const long long* check_type = &s;
  66   static_assert(s == 4);
  67 }