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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_BINDINGS_LIB_SHARED_PTR_H_ |
| 6 #define MOJO_PUBLIC_BINDINGS_LIB_SHARED_PTR_H_ |
| 7 |
| 8 #include "mojo/public/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) { |
| 22 impl_.mutable_value()->ptr = ptr; |
| 23 } |
| 24 |
| 25 // Default copy-constructor and assignment operator are OK. |
| 26 |
| 27 P* get() { |
| 28 return impl_.value().ptr; |
| 29 } |
| 30 const P* get() const { |
| 31 return impl_.value().ptr; |
| 32 } |
| 33 |
| 34 P* operator->() { return get(); } |
| 35 const P* operator->() const { return get(); } |
| 36 |
| 37 private: |
| 38 class Impl { |
| 39 public: |
| 40 ~Impl() { |
| 41 if (ptr) |
| 42 delete ptr; |
| 43 } |
| 44 |
| 45 Impl() : ptr(NULL) { |
| 46 } |
| 47 |
| 48 Impl(P* ptr) : ptr(ptr) { |
| 49 } |
| 50 |
| 51 P* ptr; |
| 52 |
| 53 private: |
| 54 MOJO_DISALLOW_COPY_AND_ASSIGN(Impl); |
| 55 }; |
| 56 |
| 57 SharedData<Impl> impl_; |
| 58 }; |
| 59 |
| 60 } // namespace mojo |
| 61 } // namespace internal |
| 62 |
| 63 #endif // MOJO_PUBLIC_BINDINGS_LIB_SHARED_PTR_H_ |
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