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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef HEADLESS_PUBLIC_UTIL_MAYBE_H_ | 5 #ifndef HEADLESS_PUBLIC_UTIL_MAYBE_H_ |
6 #define HEADLESS_PUBLIC_UTIL_MAYBE_H_ | 6 #define HEADLESS_PUBLIC_UTIL_MAYBE_H_ |
7 | 7 |
8 #include <algorithm> | 8 #include <algorithm> |
9 | 9 |
10 #include "base/logging.h" | 10 #include "base/logging.h" |
11 #include "base/macros.h" | 11 #include "base/macros.h" |
12 | 12 |
13 namespace headless { | 13 namespace headless { |
14 | 14 |
15 // A simple Maybe which may or may not have a value. Based on v8::Maybe. | 15 // A simple Maybe which may or may not have a value. Based on v8::Maybe. |
| 16 // TODO(skyostil): Replace this with base::Optional once it is available. |
16 template <typename T> | 17 template <typename T> |
17 class Maybe { | 18 class Maybe { |
18 public: | 19 public: |
19 Maybe() : has_value_(false) {} | 20 Maybe() : has_value_(false) {} |
20 | 21 |
21 bool IsNothing() const { return !has_value_; } | 22 bool IsNothing() const { return !has_value_; } |
22 bool IsJust() const { return has_value_; } | 23 bool IsJust() const { return has_value_; } |
23 | 24 |
24 // Will crash if the Maybe<> is nothing. | 25 // Will crash if the Maybe<> is nothing. |
25 T& FromJust() { | 26 T& FromJust() { |
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83 } | 84 } |
84 | 85 |
85 template <class T> | 86 template <class T> |
86 Maybe<typename std::remove_reference<T>::type> Just(T&& t) { | 87 Maybe<typename std::remove_reference<T>::type> Just(T&& t) { |
87 return Maybe<typename std::remove_reference<T>::type>(std::move(t)); | 88 return Maybe<typename std::remove_reference<T>::type>(std::move(t)); |
88 } | 89 } |
89 | 90 |
90 } // namespace headless | 91 } // namespace headless |
91 | 92 |
92 #endif // HEADLESS_PUBLIC_UTIL_MAYBE_H_ | 93 #endif // HEADLESS_PUBLIC_UTIL_MAYBE_H_ |
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