93 lines
2.3 KiB
C++
93 lines
2.3 KiB
C++
// Copyright (c) 2009 The Chromium Embedded Framework Authors. All rights
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// reserved. Use of this source code is governed by a BSD-style license that
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// can be found in the LICENSE file.
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#ifndef _CPPTOC_H
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#define _CPPTOC_H
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#include "cef.h"
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#include "cef_capi.h"
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#include "base/logging.h"
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// Wrap a C++ class with a C structure.
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template <class ClassName, class StructName>
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class CefCppToC : public CefThreadSafeBase<CefBase>
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{
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public:
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// Structure representation with pointer to the C++ class.
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struct Struct
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{
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StructName struct_;
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CefCppToC<ClassName, StructName>* class_;
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};
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CefCppToC(CefRefPtr<ClassName> cls)
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: class_(cls)
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{
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DCHECK(cls.get());
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struct_.class_ = this;
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// zero the underlying structure and set base members
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memset(&struct_.struct_, 0, sizeof(StructName));
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struct_.struct_.base.size = sizeof(StructName);
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struct_.struct_.base.add_ref = struct_add_ref;
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struct_.struct_.base.release = struct_release;
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}
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virtual ~CefCppToC()
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{
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}
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CefRefPtr<ClassName> GetClass() { return class_; }
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// If returning the structure across the DLL boundary you should call
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// AddRef() on this CefCppToC object. On the other side of the DLL boundary,
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// call UnderlyingRelease() on the wrapping CefCToCpp object.
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StructName* GetStruct() { return &struct_.struct_; }
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// CefBase methods increment/decrement reference counts on both this object
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// and the underlying wrapper class.
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virtual int AddRef()
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{
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UnderlyingAddRef();
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return CefThreadSafeBase<CefBase>::AddRef();
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}
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virtual int Release()
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{
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UnderlyingRelease();
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return CefThreadSafeBase<CefBase>::Release();
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}
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// Increment/decrement reference counts on only the underlying class.
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int UnderlyingAddRef() { return class_->AddRef(); }
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int UnderlyingRelease() { return class_->Release(); }
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private:
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static int CEF_CALLBACK struct_add_ref(struct _cef_base_t* base)
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{
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DCHECK(base);
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if(!base)
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return 0;
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Struct* impl = reinterpret_cast<Struct*>(base);
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return impl->class_->AddRef();
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}
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static int CEF_CALLBACK struct_release(struct _cef_base_t* base)
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{
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DCHECK(base);
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if(!base)
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return 0;
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Struct* impl = reinterpret_cast<Struct*>(base);
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return impl->class_->Release();
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}
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protected:
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Struct struct_;
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CefRefPtr<ClassName> class_;
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};
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#endif // _CPPTOC_H
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