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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef GPU_NP_UTILS_NP_OBJECT_POINTER_H_
#define GPU_NP_UTILS_NP_OBJECT_POINTER_H_
#include "base/logging.h"
#include "gpu/np_utils/np_browser.h"
#include "gpu/np_utils/np_headers.h"
namespace gpu_plugin {
// Smart pointer for NPObjects that automatically handles reference counting.
template <typename NPObjectType>
class NPObjectPointer {
public:
NPObjectPointer() : object_(NULL) {}
NPObjectPointer(const NPObjectPointer& rhs) : object_(rhs.object_) {
Retain();
}
explicit NPObjectPointer(NPObjectType* p) : object_(p) {
Retain();
}
template <typename RHS>
NPObjectPointer(const NPObjectPointer<RHS>& rhs) : object_(rhs.Get()) {
Retain();
}
~NPObjectPointer() {
Release();
}
NPObjectPointer& operator=(const NPObjectPointer& rhs) {
if (object_ == rhs.Get())
return *this;
Release();
object_ = rhs.object_;
Retain();
return *this;
}
template <typename RHS>
NPObjectPointer& operator=(const NPObjectPointer<RHS>& rhs) {
if (object_ == rhs.Get())
return *this;
Release();
object_ = rhs.Get();
Retain();
return *this;
}
template <class RHS>
bool operator==(const NPObjectPointer<RHS>& rhs) const {
return object_ == rhs.Get();
}
template <class RHS>
bool operator!=(const NPObjectPointer<RHS>& rhs) const {
return object_ != rhs.Get();
}
// The NPObject convention for returning an NPObject pointer from a function
// is that the caller is responsible for releasing the reference count.
static NPObjectPointer FromReturned(NPObjectType* p) {
NPObjectPointer pointer(p);
pointer.Release();
return pointer;
}
// The NPObject convention for returning an NPObject pointer from a function
// is that the caller is responsible for releasing the reference count.
NPObjectType* ToReturned() const {
Retain();
return object_;
}
NPObjectType* Get() const {
return object_;
}
NPObjectType* operator->() const {
return object_;
}
NPObjectType& operator*() const {
return *object_;
}
private:
void Retain() const {
if (object_) {
NPBrowser::get()->RetainObject(object_);
}
}
void Release() const {
if (object_) {
NPBrowser::get()->ReleaseObject(object_);
}
}
NPObjectType* object_;
};
// For test diagnostics.
template <typename NPObjectType>
std::ostream& operator<<(std::ostream& stream,
const NPObjectPointer<NPObjectType>& pointer) {
return stream << pointer.Get();
}
} // namespace gpu_plugin
#endif // GPU_NP_UTILS_NP_OBJECT_POINTER_H_
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