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| 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 |
| 13 namespace v8 { |
| 14 namespace base { |
| 15 |
| 16 // Internal adapter class for implementing base::Reversed. |
| 17 template <typename T> |
| 18 class 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 // } |
| 43 template <typename T> |
| 44 ReversedAdapter<T> Reversed(T& t) { |
| 45 return ReversedAdapter<T>(t); |
| 46 } |
| 47 |
| 48 } // namespace base |
| 49 } // namespace v8 |
| 50 |
| 51 #endif // V8_BASE_ADAPTERS_H_ |
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