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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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