1 // Copyright (c) 2011 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 PPAPI_SHARED_IMPL_SCOPED_RESOURCE_H_ 6 #define PPAPI_SHARED_IMPL_SCOPED_RESOURCE_H_ 7 8 #include "ppapi/c/pp_resource.h" 9 #include "ppapi/shared_impl/ppapi_shared_export.h" 10 11 namespace ppapi { 12 13 class Resource; 14 15 // This is a version of scoped_refptr but for PP_Resources. 16 class PPAPI_SHARED_EXPORT ScopedPPResource { 17 public: 18 struct PassRef {}; 19 20 ScopedPPResource(); 21 22 // Takes one reference to the given resource. 23 explicit ScopedPPResource(PP_Resource resource); 24 25 // Assumes responsibility for one ref that the resource already has. 26 explicit ScopedPPResource(const PassRef&, PP_Resource resource); 27 28 // Helper to get the PP_Resource out of the given object and take a reference 29 // to it. 30 explicit ScopedPPResource(Resource* resource); 31 32 // Implicit copy constructor allowed. 33 ScopedPPResource(const ScopedPPResource& other); 34 35 ~ScopedPPResource(); 36 37 ScopedPPResource& operator=(PP_Resource resource); 38 ScopedPPResource& operator=(const ScopedPPResource& resource); 39 40 // Returns the PP_Resource without affecting the refcounting. 41 PP_Resource get() const { return id_; } 42 operator PP_Resource() const { return id_; } 43 44 // Returns the PP_Resource, passing the reference to the caller. This class 45 // will no longer hold the resource. 46 PP_Resource Release(); 47 48 private: 49 // Helpers to addref or release the id_ if it's non-NULL. The id_ value will 50 // be unchanged. 51 void CallAddRef(); 52 void CallRelease(); 53 54 PP_Resource id_; 55 }; 56 57 } // namespace ppapi 58 59 #endif // PPAPI_SHARED_IMPL_SCOPED_RESOURCE_H_ 60
