gdbsupport/iterator-range.h

   1 /* A range adapter that wraps begin / end iterators.
   2    Copyright (C) 2021-2023 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program 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
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef GDBSUPPORT_ITERATOR_RANGE_H
  20 #define GDBSUPPORT_ITERATOR_RANGE_H
  21
  22 /* A wrapper that allows using ranged for-loops on a range described by two
  23    iterators.  */
  24
  25 template <typename IteratorType>
  26 struct iterator_range
  27 {
  28   using iterator = IteratorType;
  29
  30   /* Create an iterator_range using BEGIN as the begin iterator.
  31
  32      Assume that the end iterator can be default-constructed.  */
  33   template <typename... Args>
  34   iterator_range (Args &&...args)
  35     : m_begin (std::forward<Args> (args)...)
  36   {}
  37
  38   /* Create an iterator range using explicit BEGIN and END iterators.  */
  39   template <typename... Args>
  40   iterator_range (IteratorType begin, IteratorType end)
  41     : m_begin (std::move (begin)), m_end (std::move (end))
  42   {}
  43
  44   /* Need these as the variadic constructor would be a better match
  45      otherwise.  */
  46   iterator_range (iterator_range &) = default;
  47   iterator_range (const iterator_range &) = default;
  48   iterator_range (iterator_range &&) = default;
  49
  50   IteratorType begin () const
  51   { return m_begin; }
  52
  53   IteratorType end () const
  54   { return m_end; }
  55
  56   /* The number of items in this iterator_range.  */
  57   std::size_t size () const
  58   { return std::distance (m_begin, m_end); }
  59
  60 private:
  61   IteratorType m_begin, m_end;
  62 };
  63
  64 #endif /* GDBSUPPORT_ITERATOR_RANGE_H */