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| 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 | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef Maybe_h | |
| 6 #define Maybe_h | |
| 7 | |
| 8 #include "platform/inspector_protocol/Platform.h" | |
| 9 #include "platform/inspector_protocol/String16.h" | |
| 10 | |
| 11 #include <memory> | |
| 12 | |
| 13 namespace blink { | |
| 14 namespace protocol { | |
| 15 | |
| 16 template<typename T> | |
| 17 class Maybe { | |
| 18 public: | |
| 19 Maybe() : m_value() { } | |
| 20 Maybe(std::unique_ptr<T> value) : m_value(std::move(value)) { } | |
| 21 void operator=(std::unique_ptr<T> value) { m_value = std::move(value); } | |
| 22 T* fromJust() const { DCHECK(m_value); return m_value.get(); } | |
| 23 T* fromMaybe(T* defaultValue) const { return m_value ? m_value.get() : defau
ltValue; } | |
| 24 bool isJust() const { return !!m_value; } | |
| 25 std::unique_ptr<T> takeJust() { DCHECK(m_value); return m_value.release(); } | |
| 26 private: | |
| 27 std::unique_ptr<T> m_value; | |
| 28 }; | |
| 29 | |
| 30 template<typename T> | |
| 31 class MaybeBase { | |
| 32 public: | |
| 33 MaybeBase() : m_isJust(false) { } | |
| 34 MaybeBase(T value) : m_isJust(true), m_value(value) { } | |
| 35 void operator=(T value) { m_value = value; m_isJust = true; } | |
| 36 T fromJust() const { DCHECK(m_isJust); return m_value; } | |
| 37 T fromMaybe(const T& defaultValue) const { return m_isJust ? m_value : defau
ltValue; } | |
| 38 bool isJust() const { return m_isJust; } | |
| 39 T takeJust() { DCHECK(m_isJust); return m_value; } | |
| 40 | |
| 41 protected: | |
| 42 bool m_isJust; | |
| 43 T m_value; | |
| 44 }; | |
| 45 | |
| 46 template<> | |
| 47 class Maybe<bool> : public MaybeBase<bool> { | |
| 48 public: | |
| 49 Maybe() { } | |
| 50 Maybe(bool value) : MaybeBase(value) { } | |
| 51 using MaybeBase::operator=; | |
| 52 }; | |
| 53 | |
| 54 template<> | |
| 55 class Maybe<int> : public MaybeBase<int> { | |
| 56 public: | |
| 57 Maybe() { } | |
| 58 Maybe(int value) : MaybeBase(value) { } | |
| 59 using MaybeBase::operator=; | |
| 60 }; | |
| 61 | |
| 62 template<> | |
| 63 class Maybe<double> : public MaybeBase<double> { | |
| 64 public: | |
| 65 Maybe() { } | |
| 66 Maybe(double value) : MaybeBase(value) { } | |
| 67 using MaybeBase::operator=; | |
| 68 }; | |
| 69 | |
| 70 template<> | |
| 71 class Maybe<InspectorProtocolConvenienceStringType> : public MaybeBase<Inspector
ProtocolConvenienceStringType> { | |
| 72 public: | |
| 73 Maybe() { } | |
| 74 Maybe(const InspectorProtocolConvenienceStringType& value) : MaybeBase(value
) { } | |
| 75 using MaybeBase::operator=; | |
| 76 }; | |
| 77 | |
| 78 template<> | |
| 79 class Maybe<String16> : public MaybeBase<String16> { | |
| 80 public: | |
| 81 Maybe() { } | |
| 82 Maybe(const String16& value) : MaybeBase(value) { } | |
| 83 using MaybeBase::operator=; | |
| 84 }; | |
| 85 | |
| 86 } // namespace platform | |
| 87 } // namespace blink | |
| 88 | |
| 89 #endif // !defined(Maybe_h) | |
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