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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 Maybe_h | 5 #ifndef Maybe_h |
| 6 #define Maybe_h | 6 #define Maybe_h |
| 7 | 7 |
| 8 #include "platform/PlatformExport.h" | 8 #include "platform/PlatformExport.h" |
| 9 | 9 |
| 10 namespace blink { | 10 namespace blink { |
| 11 namespace protocol { | 11 namespace protocol { |
| 12 | 12 |
| 13 class String16; | 13 class String16; |
| 14 | 14 |
| 15 template<typename T> | 15 template<typename T> |
| 16 class Maybe { | 16 class Maybe { |
| 17 public: | 17 public: |
| 18 Maybe() { } | 18 Maybe() { } |
| 19 Maybe(PassOwnPtr<T> value) : m_value(std::move(value)) { } | 19 Maybe(PassOwnPtr<T> value) : m_value(std::move(value)) { } |
| 20 void operator=(PassOwnPtr<T> value) { m_value = std::move(value); } | 20 void operator=(PassOwnPtr<T> value) { m_value = std::move(value); } |
| 21 T* fromJust() const { ASSERT(m_value); return m_value.get(); } | 21 T* fromJust() const { DCHECK(m_value); return m_value.get(); } |
| 22 T* fromMaybe(T* defaultValue) const { return m_value ? m_value.get() : defau
ltValue; } | 22 T* fromMaybe(T* defaultValue) const { return m_value ? m_value.get() : defau
ltValue; } |
| 23 bool isJust() const { return !!m_value; } | 23 bool isJust() const { return !!m_value; } |
| 24 PassOwnPtr<T> takeJust() { ASSERT(m_value); return m_value.release(); } | 24 PassOwnPtr<T> takeJust() { DCHECK(m_value); return m_value.release(); } |
| 25 private: | 25 private: |
| 26 OwnPtr<T> m_value; | 26 OwnPtr<T> m_value; |
| 27 }; | 27 }; |
| 28 | 28 |
| 29 template<typename T> | 29 template<typename T> |
| 30 class MaybeBase { | 30 class MaybeBase { |
| 31 public: | 31 public: |
| 32 MaybeBase() : m_isJust(false) { } | 32 MaybeBase() : m_isJust(false) { } |
| 33 MaybeBase(T value) : m_isJust(true), m_value(value) { } | 33 MaybeBase(T value) : m_isJust(true), m_value(value) { } |
| 34 void operator=(T value) { m_value = value; m_isJust = true; } | 34 void operator=(T value) { m_value = value; m_isJust = true; } |
| 35 T fromJust() const { ASSERT(m_isJust); return m_value; } | 35 T fromJust() const { DCHECK(m_isJust); return m_value; } |
| 36 T fromMaybe(const T& defaultValue) const { return m_isJust ? m_value : defau
ltValue; } | 36 T fromMaybe(const T& defaultValue) const { return m_isJust ? m_value : defau
ltValue; } |
| 37 bool isJust() const { return m_isJust; } | 37 bool isJust() const { return m_isJust; } |
| 38 T takeJust() { ASSERT(m_isJust); return m_value; } | 38 T takeJust() { DCHECK(m_isJust); return m_value; } |
| 39 | 39 |
| 40 protected: | 40 protected: |
| 41 bool m_isJust; | 41 bool m_isJust; |
| 42 T m_value; | 42 T m_value; |
| 43 }; | 43 }; |
| 44 | 44 |
| 45 template<> | 45 template<> |
| 46 class Maybe<bool> : public MaybeBase<bool> { | 46 class Maybe<bool> : public MaybeBase<bool> { |
| 47 public: | 47 public: |
| 48 Maybe() { } | 48 Maybe() { } |
| (...skipping 30 matching lines...) Expand all Loading... |
| 79 public: | 79 public: |
| 80 Maybe() { } | 80 Maybe() { } |
| 81 Maybe(const String16& value) : MaybeBase(value) { } | 81 Maybe(const String16& value) : MaybeBase(value) { } |
| 82 using MaybeBase::operator=; | 82 using MaybeBase::operator=; |
| 83 }; | 83 }; |
| 84 | 84 |
| 85 } // namespace platform | 85 } // namespace platform |
| 86 } // namespace blink | 86 } // namespace blink |
| 87 | 87 |
| 88 #endif // !defined(Maybe_h) | 88 #endif // !defined(Maybe_h) |
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