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// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <iterator>
namespace v8 {
namespace base {
template <class Category, class Type, class Diff = std::ptrdiff_t,
class Pointer = Type*, class Reference = Type&>
struct iterator {
typedef Category iterator_category;
typedef Type value_type;
typedef Diff difference_type;
typedef Pointer pointer;
typedef Reference reference;
// The intention of the base::iterator_range class is to encapsulate two
// iterators so that the range defined by the iterators can be used like
// a regular STL container (actually only a subset of the full container
// functionality is available usually).
template <typename ForwardIterator>
class iterator_range {
typedef ForwardIterator iterator;
typedef ForwardIterator const_iterator;
typedef typename std::iterator_traits<iterator>::pointer pointer;
typedef typename std::iterator_traits<iterator>::reference reference;
typedef typename std::iterator_traits<iterator>::value_type value_type;
typename std::iterator_traits<iterator>::difference_type difference_type;
iterator_range() : begin_(), end_() {}
template <typename ForwardIterator1, typename ForwardIterator2>
iterator_range(ForwardIterator1&& begin, ForwardIterator2&& end)
: begin_(std::forward<ForwardIterator1>(begin)),
end_(std::forward<ForwardIterator2>(end)) {}
iterator begin() { return begin_; }
iterator end() { return end_; }
const_iterator begin() const { return begin_; }
const_iterator end() const { return end_; }
const_iterator cbegin() const { return begin_; }
const_iterator cend() const { return end_; }
bool empty() const { return cbegin() == cend(); }
// Random Access iterators only.
reference operator[](difference_type n) { return begin()[n]; }
difference_type size() const { return cend() - cbegin(); }
const_iterator const begin_;
const_iterator const end_;
} // namespace base
} // namespace v8
#endif // V8_BASE_ITERATOR_H_