libstdc++-v3/testsuite/24_iterators/range_access/range_access_cpp17.cc

   1 // { dg-do compile { target c++17 } }
   2
   3 // Copyright (C) 2017-2024 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 // C++ 2017 27.7, range access [iterator.range]
  21
  22 #include <iterator>
  23
  24 void
  25 test01()
  26 {
  27   using std::reverse_iterator;
  28   static int i[1];
  29   static_assert(std::cbegin(i) == i);
  30   static_assert(std::cend(i) == i+1);
  31   static_assert(std::rbegin(i) == reverse_iterator<int*>(i+1));
  32   static_assert(std::rend(i) == reverse_iterator<int*>(i));
  33   static_assert(std::crbegin(i) == reverse_iterator<int*>(i+1));
  34   static_assert(std::crend(i) == reverse_iterator<int*>(i));
  35 }
  36
  37 void
  38 test02()
  39 {
  40   static int i[] = { 1, 2 };
  41   static_assert(std::distance(std::begin(i), std::end(i)) == 2);
  42   static_assert(std::distance(std::cbegin(i), std::cend(i)) == 2);
  43
  44   // LWG 2280
  45   static_assert( noexcept(std::begin(i)),  "LWG 2280" );
  46   static_assert( noexcept(std::end(i)),    "LWG 2280" );
  47   static_assert( noexcept(std::cbegin(i)), "LWG 2280" );
  48   static_assert( noexcept(std::cend(i)),   "LWG 2280" );
  49
  50   // LWG 3537
  51   static_assert( noexcept(std::rbegin(i)),  "LWG 3537" );
  52   static_assert( noexcept(std::rend(i)),    "LWG 3537" );
  53 }
  54
  55 void
  56 test03()
  57 {
  58   using std::reverse_iterator;
  59   static constexpr std::initializer_list<int> il{1};
  60   static_assert(std::cbegin(il) == il.begin());
  61   static_assert(std::cend(il) == il.end());
  62   static_assert(std::rbegin(il) == reverse_iterator<const int*>(il.end()));
  63   static_assert(std::rend(il) == reverse_iterator<const int*>(il.begin()));
  64   static_assert(std::crbegin(il) == reverse_iterator<const int*>(il.end()));
  65   static_assert(std::crend(il) == reverse_iterator<const int*>(il.begin()));
  66
  67   // LWG 3537
  68   static_assert( noexcept(std::rbegin(il)),  "LWG 3537" );
  69   static_assert( noexcept(std::rend(il)),    "LWG 3537" );
  70 }