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

   1 // { dg-options "-std=gnu++17" }
   2 // { dg-do compile { target c++17 } }
   3
   4 // Copyright (C) 2017-2020 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 // C++ 2017 27.7, range access [iterator.range]
  22
  23 #include <iterator>
  24
  25 void
  26 test01()
  27 {
  28   using std::reverse_iterator;
  29   static int i[1];
  30   static_assert(std::cbegin(i) == i);
  31   static_assert(std::cend(i) == i+1);
  32   static_assert(std::rbegin(i) == reverse_iterator<int*>(i+1));
  33   static_assert(std::rend(i) == reverse_iterator<int*>(i));
  34   static_assert(std::crbegin(i) == reverse_iterator<int*>(i+1));
  35   static_assert(std::crend(i) == reverse_iterator<int*>(i));
  36 }
  37
  38 void
  39 test02()
  40 {
  41   static int i[] = { 1, 2 };
  42   static_assert(std::distance(std::begin(i), std::end(i)) == 2);
  43   static_assert(std::distance(std::cbegin(i), std::cend(i)) == 2);
  44 }
  45
  46 void
  47 test03()
  48 {
  49   using std::reverse_iterator;
  50   static constexpr std::initializer_list<int> il{1};
  51   static_assert(std::cbegin(il) == il.begin());
  52   static_assert(std::cend(il) == il.end());
  53   static_assert(std::rbegin(il) == reverse_iterator<const int*>(il.end()));
  54   static_assert(std::rend(il) == reverse_iterator<const int*>(il.begin()));
  55   static_assert(std::crbegin(il) == reverse_iterator<const int*>(il.end()));
  56   static_assert(std::crend(il) == reverse_iterator<const int*>(il.begin()));
  57 }