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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Slightly adapted for inclusion in V8.
// Copyright 2014 the V8 project authors. All rights reserved.
#ifndef V8_BASE_ADAPTERS_H_
#define V8_BASE_ADAPTERS_H_
#include <iterator>
#include "src/base/macros.h"
namespace v8 {
namespace base {
// Internal adapter class for implementing base::Reversed.
template <typename T>
class ReversedAdapter {
public:
using Iterator =
std::reverse_iterator<decltype(std::begin(std::declval<T>()))>;
explicit ReversedAdapter(T& t) : t_(t) {}
ReversedAdapter(const ReversedAdapter& ra) V8_NOEXCEPT = default;
// TODO(clemensh): Use std::rbegin/std::rend once we have C++14 support.
Iterator begin() const { return Iterator(std::end(t_)); }
Iterator end() const { return Iterator(std::begin(t_)); }
private:
T& t_;
DISALLOW_ASSIGN(ReversedAdapter);
};
// Reversed returns a container adapter usable in a range-based "for" statement
// for iterating a reversible container in reverse order.
//
// Example:
//
// std::vector<int> v = ...;
// for (int i : base::Reversed(v)) {
// // iterates through v from back to front
// }
template <typename T>
ReversedAdapter<T> Reversed(T&& t) {
return ReversedAdapter<T>(t);
}
} // namespace base
} // namespace v8
#endif // V8_BASE_ADAPTERS_H_
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