1// Copyright 2014 The Chromium Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5// Slightly adapted for inclusion in V8. 6// Copyright 2014 the V8 project authors. All rights reserved. 7 8#ifndef V8_BASE_ADAPTERS_H_ 9#define V8_BASE_ADAPTERS_H_ 10 11#include "src/base/macros.h" 12 13namespace v8 { 14namespace base { 15 16// Internal adapter class for implementing base::Reversed. 17template <typename T> 18class ReversedAdapter { 19 public: 20 typedef decltype(static_cast<T*>(nullptr)->rbegin()) Iterator; 21 22 explicit ReversedAdapter(T& t) : t_(t) {} 23 ReversedAdapter(const ReversedAdapter& ra) : t_(ra.t_) {} 24 25 Iterator begin() const { return t_.rbegin(); } 26 Iterator end() const { return t_.rend(); } 27 28 private: 29 T& t_; 30 31 DISALLOW_ASSIGN(ReversedAdapter); 32}; 33 34// Reversed returns a container adapter usable in a range-based "for" statement 35// for iterating a reversible container in reverse order. 36// 37// Example: 38// 39// std::vector<int> v = ...; 40// for (int i : base::Reversed(v)) { 41// // iterates through v from back to front 42// } 43template <typename T> 44ReversedAdapter<T> Reversed(T& t) { 45 return ReversedAdapter<T>(t); 46} 47 48} // namespace base 49} // namespace v8 50 51#endif // V8_BASE_ADAPTERS_H_ 52