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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 #ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_SHARED_PTR_H_ | |
6 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_SHARED_PTR_H_ | |
7 | |
8 #include "mojo/public/cpp/bindings/lib/shared_data.h" | |
9 | |
10 namespace mojo { | |
11 namespace internal { | |
12 | |
13 // Used to manage a heap-allocated instance of P that can be shared via | |
14 // reference counting. When the last reference is dropped, the instance is | |
15 // deleted. | |
16 template <typename P> | |
17 class SharedPtr { | |
18 public: | |
19 SharedPtr() {} | |
20 | |
21 explicit SharedPtr(P* ptr) { impl_.mutable_value()->ptr = ptr; } | |
22 | |
23 // Default copy-constructor and assignment operator are OK. | |
24 | |
25 P* get() { return impl_.value().ptr; } | |
26 const P* get() const { return impl_.value().ptr; } | |
27 | |
28 void reset() { impl_.reset(); } | |
29 | |
30 P* operator->() { return get(); } | |
31 const P* operator->() const { return get(); } | |
32 | |
33 private: | |
34 class Impl { | |
35 public: | |
36 ~Impl() { | |
37 if (ptr) | |
38 delete ptr; | |
39 } | |
40 | |
41 Impl() : ptr(nullptr) {} | |
42 | |
43 Impl(P* ptr) : ptr(ptr) {} | |
44 | |
45 P* ptr; | |
46 | |
47 private: | |
48 MOJO_DISALLOW_COPY_AND_ASSIGN(Impl); | |
49 }; | |
50 | |
51 SharedData<Impl> impl_; | |
52 }; | |
53 | |
54 } // namespace mojo | |
55 } // namespace internal | |
56 | |
57 #endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_SHARED_PTR_H_ | |
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