mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-04 02:57:38 +00:00
81 lines
1.4 KiB
C++
81 lines
1.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
/* A class for non-null strong pointers to reference-counted objects. */
|
|
|
|
#ifndef mozilla_dom_OwningNonNull_h
|
|
#define mozilla_dom_OwningNonNull_h
|
|
|
|
#include "nsAutoPtr.h"
|
|
|
|
namespace mozilla {
|
|
namespace dom {
|
|
|
|
template<class T>
|
|
class OwningNonNull
|
|
{
|
|
public:
|
|
OwningNonNull()
|
|
#ifdef DEBUG
|
|
: mInited(false)
|
|
#endif
|
|
{}
|
|
|
|
operator T&()
|
|
{
|
|
MOZ_ASSERT(mInited);
|
|
MOZ_ASSERT(mPtr, "OwningNonNull<T> was set to null");
|
|
return *mPtr;
|
|
}
|
|
|
|
void operator=(T* aValue)
|
|
{
|
|
init(aValue);
|
|
}
|
|
|
|
void operator=(const already_AddRefed<T>& aValue)
|
|
{
|
|
init(aValue);
|
|
}
|
|
|
|
already_AddRefed<T> forget()
|
|
{
|
|
#ifdef DEBUG
|
|
mInited = false;
|
|
#endif
|
|
return mPtr.forget();
|
|
}
|
|
|
|
// Make us work with smart pointer helpers that expect a get().
|
|
T* get() const
|
|
{
|
|
MOZ_ASSERT(mInited);
|
|
MOZ_ASSERT(mPtr);
|
|
return mPtr;
|
|
}
|
|
|
|
protected:
|
|
template<typename U>
|
|
void init(U aValue)
|
|
{
|
|
mPtr = aValue;
|
|
MOZ_ASSERT(mPtr);
|
|
#ifdef DEBUG
|
|
mInited = true;
|
|
#endif
|
|
}
|
|
|
|
nsRefPtr<T> mPtr;
|
|
#ifdef DEBUG
|
|
bool mInited;
|
|
#endif
|
|
};
|
|
|
|
} // namespace dom
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_dom_OwningNonNull_h
|