122 lines
3.2 KiB
C++
122 lines
3.2 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 _CTOCPP_H
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#define _CTOCPP_H
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#include "include/cef.h"
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#include "include/cef_capi.h"
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#include "libcef_dll/cef_logging.h"
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// Wrap a C structure with a C++ class. This is used when the implementation
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// exists on the other side of the DLL boundary but will have methods called on
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// this side of the DLL boundary.
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template <class ClassName, class BaseName, class StructName>
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class CefCToCpp : public BaseName
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{
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public:
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// Use this method to create a wrapper class instance for a structure
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// received from the other side.
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static CefRefPtr<BaseName> Wrap(StructName* s)
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{
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if (!s)
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return NULL;
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// Wrap their structure with the CefCToCpp object.
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ClassName* wrapper = new ClassName(s);
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// Put the wrapper object in a smart pointer.
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CefRefPtr<BaseName> wrapperPtr(wrapper);
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// Release the reference that was added to the CefCppToC wrapper object on
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// the other side before their structure was passed to us.
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wrapper->UnderlyingRelease();
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// Return the smart pointer.
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return wrapperPtr;
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}
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// Use this method to retrieve the underlying structure from a wrapper class
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// instance for return back to the other side.
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static StructName* Unwrap(CefRefPtr<BaseName> c)
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{
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DCHECK(c.get());
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// Cast the object to our wrapper class type.
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ClassName* wrapper = static_cast<ClassName*>(c.get());
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// Add a reference to the CefCppToC wrapper object on the other side that
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// will be released once the structure is received.
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wrapper->UnderlyingAddRef();
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// Return their original structure.
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return wrapper->GetStruct();
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}
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CefCToCpp(StructName* str)
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: struct_(str)
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{
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DCHECK(str);
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#ifndef NDEBUG
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CefAtomicIncrement(&DebugObjCt);
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#endif
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}
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virtual ~CefCToCpp()
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{
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#ifndef NDEBUG
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CefAtomicDecrement(&DebugObjCt);
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#endif
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}
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// If returning the structure across the DLL boundary you should call
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// UnderlyingAddRef() on this wrapping CefCToCpp object. On the other side of
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// the DLL boundary, call Release() on the CefCppToC object.
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StructName* GetStruct() { return struct_; }
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// CefBase methods increment/decrement reference counts on both this object
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// and the underlying wrapped structure.
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int AddRef()
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{
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UnderlyingAddRef();
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return refct_.AddRef();
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}
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int Release()
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{
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UnderlyingRelease();
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int retval = refct_.Release();
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if (retval == 0)
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delete this;
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return retval;
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}
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int GetRefCt() { return refct_.GetRefCt(); }
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// Increment/decrement reference counts on only the underlying class.
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int UnderlyingAddRef()
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{
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if(!struct_->base.add_ref)
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return 0;
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return struct_->base.add_ref(&struct_->base);
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}
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int UnderlyingRelease()
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{
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if(!struct_->base.release)
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return 0;
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return struct_->base.release(&struct_->base);
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}
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int UnderlyingGetRefCt()
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{
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if(!struct_->base.get_refct)
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return 0;
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return struct_->base.get_refct(&struct_->base);
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}
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#ifndef NDEBUG
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// Simple tracking of allocated objects.
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static long DebugObjCt;
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#endif
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protected:
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CefRefCount refct_;
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StructName* struct_;
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};
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#endif // _CTOCPP_H
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