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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 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 | 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 MOJO_PUBLIC_CPP_BINDINGS_STRUCT_PTR_H_ | 5 #ifndef MOJO_PUBLIC_CPP_BINDINGS_STRUCT_PTR_H_ |
6 #define MOJO_PUBLIC_CPP_BINDINGS_STRUCT_PTR_H_ | 6 #define MOJO_PUBLIC_CPP_BINDINGS_STRUCT_PTR_H_ |
7 | 7 |
8 #include <assert.h> | |
9 | |
10 #include <new> | 8 #include <new> |
11 | 9 |
| 10 #include "mojo/public/cpp/environment/logging.h" |
12 #include "mojo/public/cpp/system/macros.h" | 11 #include "mojo/public/cpp/system/macros.h" |
13 | 12 |
14 namespace mojo { | 13 namespace mojo { |
15 namespace internal { | 14 namespace internal { |
16 | 15 |
17 template <typename Struct> | 16 template <typename Struct> |
18 class StructHelper { | 17 class StructHelper { |
19 public: | 18 public: |
20 template <typename Ptr> | 19 template <typename Ptr> |
21 static void Initialize(Ptr* ptr) { ptr->Initialize(); } | 20 static void Initialize(Ptr* ptr) { ptr->Initialize(); } |
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48 void reset() { | 47 void reset() { |
49 if (ptr_) { | 48 if (ptr_) { |
50 delete ptr_; | 49 delete ptr_; |
51 ptr_ = NULL; | 50 ptr_ = NULL; |
52 } | 51 } |
53 } | 52 } |
54 | 53 |
55 bool is_null() const { return ptr_ == NULL; } | 54 bool is_null() const { return ptr_ == NULL; } |
56 | 55 |
57 Struct& operator*() const { | 56 Struct& operator*() const { |
58 assert(ptr_); | 57 MOJO_DCHECK(ptr_); |
59 return *ptr_; | 58 return *ptr_; |
60 } | 59 } |
61 Struct* operator->() const { | 60 Struct* operator->() const { |
62 assert(ptr_); | 61 MOJO_DCHECK(ptr_); |
63 return ptr_; | 62 return ptr_; |
64 } | 63 } |
65 Struct* get() const { return ptr_; } | 64 Struct* get() const { return ptr_; } |
66 | 65 |
67 void Swap(StructPtr* other) { | 66 void Swap(StructPtr* other) { |
68 std::swap(ptr_, other->ptr_); | 67 std::swap(ptr_, other->ptr_); |
69 } | 68 } |
70 | 69 |
71 private: | 70 private: |
72 typedef Struct* StructPtr::*Testable; | 71 typedef Struct* StructPtr::*Testable; |
73 | 72 |
74 public: | 73 public: |
75 operator Testable() const { return ptr_ ? &StructPtr::ptr_ : 0; } | 74 operator Testable() const { return ptr_ ? &StructPtr::ptr_ : 0; } |
76 | 75 |
77 private: | 76 private: |
78 friend class internal::StructHelper<Struct>; | 77 friend class internal::StructHelper<Struct>; |
79 void Initialize() { assert(!ptr_); ptr_ = new Struct(); } | 78 void Initialize() { |
| 79 MOJO_DCHECK(!ptr_); |
| 80 ptr_ = new Struct(); |
| 81 } |
80 | 82 |
81 void Take(StructPtr* other) { | 83 void Take(StructPtr* other) { |
82 reset(); | 84 reset(); |
83 Swap(other); | 85 Swap(other); |
84 } | 86 } |
85 | 87 |
86 Struct* ptr_; | 88 Struct* ptr_; |
87 }; | 89 }; |
88 | 90 |
89 // Designed to be used when Struct is small and copyable. | 91 // Designed to be used when Struct is small and copyable. |
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109 | 111 |
110 void reset() { | 112 void reset() { |
111 is_null_ = true; | 113 is_null_ = true; |
112 value_.~Struct(); | 114 value_.~Struct(); |
113 new (&value_) Struct(); | 115 new (&value_) Struct(); |
114 } | 116 } |
115 | 117 |
116 bool is_null() const { return is_null_; } | 118 bool is_null() const { return is_null_; } |
117 | 119 |
118 Struct& operator*() const { | 120 Struct& operator*() const { |
119 assert(!is_null_); | 121 MOJO_DCHECK(!is_null_); |
120 return value_; | 122 return value_; |
121 } | 123 } |
122 Struct* operator->() const { | 124 Struct* operator->() const { |
123 assert(!is_null_); | 125 MOJO_DCHECK(!is_null_); |
124 return &value_; | 126 return &value_; |
125 } | 127 } |
126 Struct* get() const { return &value_; } | 128 Struct* get() const { return &value_; } |
127 | 129 |
128 void Swap(InlinedStructPtr* other) { | 130 void Swap(InlinedStructPtr* other) { |
129 std::swap(value_, other->value_); | 131 std::swap(value_, other->value_); |
130 std::swap(is_null_, other->is_null_); | 132 std::swap(is_null_, other->is_null_); |
131 } | 133 } |
132 | 134 |
133 private: | 135 private: |
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145 Swap(other); | 147 Swap(other); |
146 } | 148 } |
147 | 149 |
148 mutable Struct value_; | 150 mutable Struct value_; |
149 bool is_null_; | 151 bool is_null_; |
150 }; | 152 }; |
151 | 153 |
152 } // namespace mojo | 154 } // namespace mojo |
153 | 155 |
154 #endif // MOJO_PUBLIC_CPP_BINDINGS_STRUCT_PTR_H_ | 156 #endif // MOJO_PUBLIC_CPP_BINDINGS_STRUCT_PTR_H_ |
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