118 lines
3.5 KiB
C++
118 lines
3.5 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 CEF_LIBCEF_DLL_CTOCPP_CTOCPP_H_
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#define CEF_LIBCEF_DLL_CTOCPP_CTOCPP_H_
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#pragma once
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#include "include/base/cef_logging.h"
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#include "include/base/cef_macros.h"
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#include "include/cef_base.h"
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#include "include/capi/cef_base_capi.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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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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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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if (!c.get())
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return NULL;
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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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explicit CefCToCpp(StructName* str)
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: struct_(str) {
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DCHECK(str);
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#ifndef NDEBUG
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base::AtomicRefCountInc(&DebugObjCt);
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#endif
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}
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virtual ~CefCToCpp() {
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#ifndef NDEBUG
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base::AtomicRefCountDec(&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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void AddRef() const {
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UnderlyingAddRef();
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ref_count_.AddRef();
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}
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bool Release() const {
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UnderlyingRelease();
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if (ref_count_.Release()) {
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delete this;
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return true;
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}
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return false;
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}
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bool HasOneRef() const { return ref_count_.HasOneRef(); }
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// Increment/decrement reference counts on only the underlying class.
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void UnderlyingAddRef() const {
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if (struct_->base.add_ref)
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struct_->base.add_ref(&struct_->base);
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}
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bool UnderlyingRelease() const {
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if (!struct_->base.release)
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return false;
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return struct_->base.release(&struct_->base) ? true : false;
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}
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bool UnderlyingHasOneRef() const {
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if (!struct_->base.has_one_ref)
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return false;
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return struct_->base.has_one_ref(&struct_->base) ? true : false;
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}
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#ifndef NDEBUG
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// Simple tracking of allocated objects.
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static base::AtomicRefCount DebugObjCt; // NOLINT(runtime/int)
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#endif
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protected:
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StructName* struct_;
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private:
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CefRefCount ref_count_;
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DISALLOW_COPY_AND_ASSIGN(CefCToCpp);
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};
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#endif // CEF_LIBCEF_DLL_CTOCPP_CTOCPP_H_
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