mirror of
https://github.com/mozilla/gecko-dev.git
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1463 lines
34 KiB
C++
1463 lines
34 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsAutoPtr_h___
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#define nsAutoPtr_h___
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#include "nsCOMPtr.h"
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#include "nsCycleCollectionNoteChild.h"
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#include "mozilla/MemoryReporting.h"
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/*****************************************************************************/
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// template <class T> class nsAutoPtrGetterTransfers;
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template <class T>
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class nsAutoPtr
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{
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private:
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void**
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begin_assignment()
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{
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assign(0);
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return reinterpret_cast<void**>(&mRawPtr);
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}
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void
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assign( T* newPtr )
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{
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T* oldPtr = mRawPtr;
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if (newPtr != nullptr && newPtr == oldPtr) {
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NS_RUNTIMEABORT("Logic flaw in the caller");
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}
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mRawPtr = newPtr;
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delete oldPtr;
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}
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// |class Ptr| helps us prevent implicit "copy construction"
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// through |operator T*() const| from a |const nsAutoPtr<T>|
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// because two implicit conversions in a row aren't allowed.
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// It still allows assignment from T* through implicit conversion
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// from |T*| to |nsAutoPtr<T>::Ptr|
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class Ptr
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{
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public:
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Ptr( T* aPtr )
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: mPtr(aPtr)
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{
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}
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operator T*() const
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{
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return mPtr;
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}
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private:
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T* mPtr;
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};
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private:
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T* mRawPtr;
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public:
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typedef T element_type;
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~nsAutoPtr()
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{
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delete mRawPtr;
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}
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// Constructors
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nsAutoPtr()
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: mRawPtr(0)
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// default constructor
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{
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}
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nsAutoPtr( Ptr aRawPtr )
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: mRawPtr(aRawPtr)
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// construct from a raw pointer (of the right type)
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{
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}
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// This constructor shouldn't exist; we should just use the &&
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// constructor.
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nsAutoPtr( nsAutoPtr<T>& aSmartPtr )
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: mRawPtr( aSmartPtr.forget() )
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// Construct by transferring ownership from another smart pointer.
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{
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}
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nsAutoPtr( nsAutoPtr<T>&& aSmartPtr )
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: mRawPtr( aSmartPtr.forget() )
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// Construct by transferring ownership from another smart pointer.
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{
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}
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// Assignment operators
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nsAutoPtr<T>&
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operator=( T* rhs )
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// assign from a raw pointer (of the right type)
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{
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assign(rhs);
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return *this;
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}
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nsAutoPtr<T>& operator=( nsAutoPtr<T>& rhs )
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// assign by transferring ownership from another smart pointer.
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{
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assign(rhs.forget());
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return *this;
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}
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// Other pointer operators
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T*
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get() const
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/*
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Prefer the implicit conversion provided automatically by
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|operator T*() const|. Use |get()| _only_ to resolve
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ambiguity.
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*/
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{
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return mRawPtr;
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}
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operator T*() const
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/*
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...makes an |nsAutoPtr| act like its underlying raw pointer
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type whenever it is used in a context where a raw pointer
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is expected. It is this operator that makes an |nsAutoPtr|
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substitutable for a raw pointer.
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Prefer the implicit use of this operator to calling |get()|,
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except where necessary to resolve ambiguity.
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*/
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{
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return get();
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}
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T*
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forget()
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{
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T* temp = mRawPtr;
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mRawPtr = 0;
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return temp;
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}
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T*
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operator->() const
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{
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NS_PRECONDITION(mRawPtr != 0, "You can't dereference a NULL nsAutoPtr with operator->().");
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return get();
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}
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// This operator is needed for gcc <= 4.0.* and for Sun Studio; it
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// causes internal compiler errors for some MSVC versions. (It's not
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// clear to me whether it should be needed.)
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#ifndef _MSC_VER
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template <class U, class V>
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U&
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operator->*(U V::* aMember)
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{
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NS_PRECONDITION(mRawPtr != 0, "You can't dereference a NULL nsAutoPtr with operator->*().");
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return get()->*aMember;
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}
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#endif
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nsAutoPtr<T>*
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get_address()
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// This is not intended to be used by clients. See |address_of|
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// below.
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{
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return this;
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}
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const nsAutoPtr<T>*
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get_address() const
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// This is not intended to be used by clients. See |address_of|
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// below.
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{
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return this;
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}
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public:
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T&
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operator*() const
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{
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NS_PRECONDITION(mRawPtr != 0, "You can't dereference a NULL nsAutoPtr with operator*().");
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return *get();
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}
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T**
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StartAssignment()
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{
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#ifndef NSCAP_FEATURE_INLINE_STARTASSIGNMENT
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return reinterpret_cast<T**>(begin_assignment());
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#else
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assign(0);
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return reinterpret_cast<T**>(&mRawPtr);
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#endif
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}
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};
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template <class T>
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inline
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nsAutoPtr<T>*
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address_of( nsAutoPtr<T>& aPtr )
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{
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return aPtr.get_address();
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}
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template <class T>
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inline
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const nsAutoPtr<T>*
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address_of( const nsAutoPtr<T>& aPtr )
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{
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return aPtr.get_address();
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}
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template <class T>
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class nsAutoPtrGetterTransfers
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/*
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...
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This class is designed to be used for anonymous temporary objects in the
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argument list of calls that return COM interface pointers, e.g.,
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nsAutoPtr<IFoo> fooP;
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...->GetTransferedPointer(getter_Transfers(fooP))
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DO NOT USE THIS TYPE DIRECTLY IN YOUR CODE. Use |getter_Transfers()| instead.
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When initialized with a |nsAutoPtr|, as in the example above, it returns
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a |void**|, a |T**|, or an |nsISupports**| as needed, that the
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outer call (|GetTransferedPointer| in this case) can fill in.
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This type should be a nested class inside |nsAutoPtr<T>|.
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*/
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{
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public:
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explicit
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nsAutoPtrGetterTransfers( nsAutoPtr<T>& aSmartPtr )
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: mTargetSmartPtr(aSmartPtr)
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{
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// nothing else to do
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}
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operator void**()
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{
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return reinterpret_cast<void**>(mTargetSmartPtr.StartAssignment());
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}
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operator T**()
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{
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return mTargetSmartPtr.StartAssignment();
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}
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T*&
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operator*()
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{
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return *(mTargetSmartPtr.StartAssignment());
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}
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private:
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nsAutoPtr<T>& mTargetSmartPtr;
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};
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template <class T>
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inline
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nsAutoPtrGetterTransfers<T>
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getter_Transfers( nsAutoPtr<T>& aSmartPtr )
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/*
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Used around a |nsAutoPtr| when
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...makes the class |nsAutoPtrGetterTransfers<T>| invisible.
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*/
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{
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return nsAutoPtrGetterTransfers<T>(aSmartPtr);
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}
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// Comparing two |nsAutoPtr|s
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template <class T, class U>
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inline
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bool
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operator==( const nsAutoPtr<T>& lhs, const nsAutoPtr<U>& rhs )
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{
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return static_cast<const T*>(lhs.get()) == static_cast<const U*>(rhs.get());
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}
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template <class T, class U>
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inline
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bool
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operator!=( const nsAutoPtr<T>& lhs, const nsAutoPtr<U>& rhs )
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{
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return static_cast<const T*>(lhs.get()) != static_cast<const U*>(rhs.get());
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}
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// Comparing an |nsAutoPtr| to a raw pointer
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template <class T, class U>
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inline
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bool
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operator==( const nsAutoPtr<T>& lhs, const U* rhs )
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{
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return static_cast<const T*>(lhs.get()) == static_cast<const U*>(rhs);
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}
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template <class T, class U>
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inline
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bool
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operator==( const U* lhs, const nsAutoPtr<T>& rhs )
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{
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return static_cast<const U*>(lhs) == static_cast<const T*>(rhs.get());
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}
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template <class T, class U>
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inline
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bool
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operator!=( const nsAutoPtr<T>& lhs, const U* rhs )
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{
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return static_cast<const T*>(lhs.get()) != static_cast<const U*>(rhs);
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}
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template <class T, class U>
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inline
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bool
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operator!=( const U* lhs, const nsAutoPtr<T>& rhs )
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{
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return static_cast<const U*>(lhs) != static_cast<const T*>(rhs.get());
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}
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// To avoid ambiguities caused by the presence of builtin |operator==|s
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// creating a situation where one of the |operator==| defined above
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// has a better conversion for one argument and the builtin has a
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// better conversion for the other argument, define additional
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// |operator==| without the |const| on the raw pointer.
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// See bug 65664 for details.
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#ifndef NSCAP_DONT_PROVIDE_NONCONST_OPEQ
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template <class T, class U>
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inline
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bool
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operator==( const nsAutoPtr<T>& lhs, U* rhs )
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{
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return static_cast<const T*>(lhs.get()) == const_cast<const U*>(rhs);
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}
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template <class T, class U>
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inline
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bool
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operator==( U* lhs, const nsAutoPtr<T>& rhs )
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{
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return const_cast<const U*>(lhs) == static_cast<const T*>(rhs.get());
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}
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template <class T, class U>
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inline
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bool
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operator!=( const nsAutoPtr<T>& lhs, U* rhs )
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{
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return static_cast<const T*>(lhs.get()) != const_cast<const U*>(rhs);
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}
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template <class T, class U>
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inline
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bool
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operator!=( U* lhs, const nsAutoPtr<T>& rhs )
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{
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return const_cast<const U*>(lhs) != static_cast<const T*>(rhs.get());
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}
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#endif
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// Comparing an |nsAutoPtr| to |0|
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template <class T>
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inline
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bool
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operator==( const nsAutoPtr<T>& lhs, NSCAP_Zero* rhs )
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// specifically to allow |smartPtr == 0|
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{
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return static_cast<const void*>(lhs.get()) == reinterpret_cast<const void*>(rhs);
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}
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template <class T>
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inline
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bool
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operator==( NSCAP_Zero* lhs, const nsAutoPtr<T>& rhs )
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// specifically to allow |0 == smartPtr|
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{
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return reinterpret_cast<const void*>(lhs) == static_cast<const void*>(rhs.get());
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}
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template <class T>
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inline
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bool
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operator!=( const nsAutoPtr<T>& lhs, NSCAP_Zero* rhs )
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// specifically to allow |smartPtr != 0|
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{
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return static_cast<const void*>(lhs.get()) != reinterpret_cast<const void*>(rhs);
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}
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template <class T>
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inline
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bool
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operator!=( NSCAP_Zero* lhs, const nsAutoPtr<T>& rhs )
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// specifically to allow |0 != smartPtr|
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{
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return reinterpret_cast<const void*>(lhs) != static_cast<const void*>(rhs.get());
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}
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#ifdef HAVE_CPP_TROUBLE_COMPARING_TO_ZERO
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// We need to explicitly define comparison operators for `int'
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// because the compiler is lame.
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template <class T>
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inline
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bool
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operator==( const nsAutoPtr<T>& lhs, int rhs )
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// specifically to allow |smartPtr == 0|
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{
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return static_cast<const void*>(lhs.get()) == reinterpret_cast<const void*>(rhs);
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}
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template <class T>
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inline
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bool
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operator==( int lhs, const nsAutoPtr<T>& rhs )
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// specifically to allow |0 == smartPtr|
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{
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return reinterpret_cast<const void*>(lhs) == static_cast<const void*>(rhs.get());
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}
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#endif // !defined(HAVE_CPP_TROUBLE_COMPARING_TO_ZERO)
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/*****************************************************************************/
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// template <class T> class nsAutoArrayPtrGetterTransfers;
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template <class T>
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class nsAutoArrayPtr
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{
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private:
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void**
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begin_assignment()
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{
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assign(0);
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return reinterpret_cast<void**>(&mRawPtr);
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}
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void
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assign( T* newPtr )
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{
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T* oldPtr = mRawPtr;
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mRawPtr = newPtr;
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delete [] oldPtr;
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}
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private:
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T* mRawPtr;
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public:
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typedef T element_type;
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~nsAutoArrayPtr()
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{
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delete [] mRawPtr;
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}
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// Constructors
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nsAutoArrayPtr()
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: mRawPtr(0)
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// default constructor
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{
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}
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nsAutoArrayPtr( T* aRawPtr )
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: mRawPtr(aRawPtr)
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// construct from a raw pointer (of the right type)
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{
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}
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nsAutoArrayPtr( nsAutoArrayPtr<T>& aSmartPtr )
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: mRawPtr( aSmartPtr.forget() )
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// Construct by transferring ownership from another smart pointer.
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{
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}
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// Assignment operators
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nsAutoArrayPtr<T>&
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operator=( T* rhs )
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// assign from a raw pointer (of the right type)
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{
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assign(rhs);
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return *this;
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}
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nsAutoArrayPtr<T>& operator=( nsAutoArrayPtr<T>& rhs )
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// assign by transferring ownership from another smart pointer.
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{
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assign(rhs.forget());
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return *this;
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}
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|
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// Other pointer operators
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|
|
T*
|
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get() const
|
|
/*
|
|
Prefer the implicit conversion provided automatically by
|
|
|operator T*() const|. Use |get()| _only_ to resolve
|
|
ambiguity.
|
|
*/
|
|
{
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return mRawPtr;
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}
|
|
|
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operator T*() const
|
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/*
|
|
...makes an |nsAutoArrayPtr| act like its underlying raw pointer
|
|
type whenever it is used in a context where a raw pointer
|
|
is expected. It is this operator that makes an |nsAutoArrayPtr|
|
|
substitutable for a raw pointer.
|
|
|
|
Prefer the implicit use of this operator to calling |get()|,
|
|
except where necessary to resolve ambiguity.
|
|
*/
|
|
{
|
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return get();
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}
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|
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T*
|
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forget()
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{
|
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T* temp = mRawPtr;
|
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mRawPtr = 0;
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return temp;
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}
|
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|
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T*
|
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operator->() const
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{
|
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NS_PRECONDITION(mRawPtr != 0, "You can't dereference a NULL nsAutoArrayPtr with operator->().");
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return get();
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}
|
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|
|
nsAutoArrayPtr<T>*
|
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get_address()
|
|
// This is not intended to be used by clients. See |address_of|
|
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// below.
|
|
{
|
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return this;
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}
|
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|
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const nsAutoArrayPtr<T>*
|
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get_address() const
|
|
// This is not intended to be used by clients. See |address_of|
|
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// below.
|
|
{
|
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return this;
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}
|
|
|
|
public:
|
|
T&
|
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operator*() const
|
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{
|
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NS_PRECONDITION(mRawPtr != 0, "You can't dereference a NULL nsAutoArrayPtr with operator*().");
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return *get();
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}
|
|
|
|
T**
|
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StartAssignment()
|
|
{
|
|
#ifndef NSCAP_FEATURE_INLINE_STARTASSIGNMENT
|
|
return reinterpret_cast<T**>(begin_assignment());
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|
#else
|
|
assign(0);
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return reinterpret_cast<T**>(&mRawPtr);
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|
#endif
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|
}
|
|
|
|
size_t
|
|
SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
|
|
{
|
|
return aMallocSizeOf(mRawPtr);
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}
|
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|
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size_t
|
|
SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
|
|
{
|
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return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
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|
}
|
|
};
|
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|
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template <class T>
|
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inline
|
|
nsAutoArrayPtr<T>*
|
|
address_of( nsAutoArrayPtr<T>& aPtr )
|
|
{
|
|
return aPtr.get_address();
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
const nsAutoArrayPtr<T>*
|
|
address_of( const nsAutoArrayPtr<T>& aPtr )
|
|
{
|
|
return aPtr.get_address();
|
|
}
|
|
|
|
template <class T>
|
|
class nsAutoArrayPtrGetterTransfers
|
|
/*
|
|
...
|
|
|
|
This class is designed to be used for anonymous temporary objects in the
|
|
argument list of calls that return COM interface pointers, e.g.,
|
|
|
|
nsAutoArrayPtr<IFoo> fooP;
|
|
...->GetTransferedPointer(getter_Transfers(fooP))
|
|
|
|
DO NOT USE THIS TYPE DIRECTLY IN YOUR CODE. Use |getter_Transfers()| instead.
|
|
|
|
When initialized with a |nsAutoArrayPtr|, as in the example above, it returns
|
|
a |void**|, a |T**|, or an |nsISupports**| as needed, that the
|
|
outer call (|GetTransferedPointer| in this case) can fill in.
|
|
|
|
This type should be a nested class inside |nsAutoArrayPtr<T>|.
|
|
*/
|
|
{
|
|
public:
|
|
explicit
|
|
nsAutoArrayPtrGetterTransfers( nsAutoArrayPtr<T>& aSmartPtr )
|
|
: mTargetSmartPtr(aSmartPtr)
|
|
{
|
|
// nothing else to do
|
|
}
|
|
|
|
operator void**()
|
|
{
|
|
return reinterpret_cast<void**>(mTargetSmartPtr.StartAssignment());
|
|
}
|
|
|
|
operator T**()
|
|
{
|
|
return mTargetSmartPtr.StartAssignment();
|
|
}
|
|
|
|
T*&
|
|
operator*()
|
|
{
|
|
return *(mTargetSmartPtr.StartAssignment());
|
|
}
|
|
|
|
private:
|
|
nsAutoArrayPtr<T>& mTargetSmartPtr;
|
|
};
|
|
|
|
template <class T>
|
|
inline
|
|
nsAutoArrayPtrGetterTransfers<T>
|
|
getter_Transfers( nsAutoArrayPtr<T>& aSmartPtr )
|
|
/*
|
|
Used around a |nsAutoArrayPtr| when
|
|
...makes the class |nsAutoArrayPtrGetterTransfers<T>| invisible.
|
|
*/
|
|
{
|
|
return nsAutoArrayPtrGetterTransfers<T>(aSmartPtr);
|
|
}
|
|
|
|
|
|
|
|
// Comparing two |nsAutoArrayPtr|s
|
|
|
|
template <class T, class U>
|
|
inline
|
|
bool
|
|
operator==( const nsAutoArrayPtr<T>& lhs, const nsAutoArrayPtr<U>& rhs )
|
|
{
|
|
return static_cast<const T*>(lhs.get()) == static_cast<const U*>(rhs.get());
|
|
}
|
|
|
|
|
|
template <class T, class U>
|
|
inline
|
|
bool
|
|
operator!=( const nsAutoArrayPtr<T>& lhs, const nsAutoArrayPtr<U>& rhs )
|
|
{
|
|
return static_cast<const T*>(lhs.get()) != static_cast<const U*>(rhs.get());
|
|
}
|
|
|
|
|
|
// Comparing an |nsAutoArrayPtr| to a raw pointer
|
|
|
|
template <class T, class U>
|
|
inline
|
|
bool
|
|
operator==( const nsAutoArrayPtr<T>& lhs, const U* rhs )
|
|
{
|
|
return static_cast<const T*>(lhs.get()) == static_cast<const U*>(rhs);
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
bool
|
|
operator==( const U* lhs, const nsAutoArrayPtr<T>& rhs )
|
|
{
|
|
return static_cast<const U*>(lhs) == static_cast<const T*>(rhs.get());
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
bool
|
|
operator!=( const nsAutoArrayPtr<T>& lhs, const U* rhs )
|
|
{
|
|
return static_cast<const T*>(lhs.get()) != static_cast<const U*>(rhs);
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
bool
|
|
operator!=( const U* lhs, const nsAutoArrayPtr<T>& rhs )
|
|
{
|
|
return static_cast<const U*>(lhs) != static_cast<const T*>(rhs.get());
|
|
}
|
|
|
|
// To avoid ambiguities caused by the presence of builtin |operator==|s
|
|
// creating a situation where one of the |operator==| defined above
|
|
// has a better conversion for one argument and the builtin has a
|
|
// better conversion for the other argument, define additional
|
|
// |operator==| without the |const| on the raw pointer.
|
|
// See bug 65664 for details.
|
|
|
|
#ifndef NSCAP_DONT_PROVIDE_NONCONST_OPEQ
|
|
template <class T, class U>
|
|
inline
|
|
bool
|
|
operator==( const nsAutoArrayPtr<T>& lhs, U* rhs )
|
|
{
|
|
return static_cast<const T*>(lhs.get()) == const_cast<const U*>(rhs);
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
bool
|
|
operator==( U* lhs, const nsAutoArrayPtr<T>& rhs )
|
|
{
|
|
return const_cast<const U*>(lhs) == static_cast<const T*>(rhs.get());
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
bool
|
|
operator!=( const nsAutoArrayPtr<T>& lhs, U* rhs )
|
|
{
|
|
return static_cast<const T*>(lhs.get()) != const_cast<const U*>(rhs);
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
bool
|
|
operator!=( U* lhs, const nsAutoArrayPtr<T>& rhs )
|
|
{
|
|
return const_cast<const U*>(lhs) != static_cast<const T*>(rhs.get());
|
|
}
|
|
#endif
|
|
|
|
|
|
|
|
// Comparing an |nsAutoArrayPtr| to |0|
|
|
|
|
template <class T>
|
|
inline
|
|
bool
|
|
operator==( const nsAutoArrayPtr<T>& lhs, NSCAP_Zero* rhs )
|
|
// specifically to allow |smartPtr == 0|
|
|
{
|
|
return static_cast<const void*>(lhs.get()) == reinterpret_cast<const void*>(rhs);
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
bool
|
|
operator==( NSCAP_Zero* lhs, const nsAutoArrayPtr<T>& rhs )
|
|
// specifically to allow |0 == smartPtr|
|
|
{
|
|
return reinterpret_cast<const void*>(lhs) == static_cast<const void*>(rhs.get());
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
bool
|
|
operator!=( const nsAutoArrayPtr<T>& lhs, NSCAP_Zero* rhs )
|
|
// specifically to allow |smartPtr != 0|
|
|
{
|
|
return static_cast<const void*>(lhs.get()) != reinterpret_cast<const void*>(rhs);
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
bool
|
|
operator!=( NSCAP_Zero* lhs, const nsAutoArrayPtr<T>& rhs )
|
|
// specifically to allow |0 != smartPtr|
|
|
{
|
|
return reinterpret_cast<const void*>(lhs) != static_cast<const void*>(rhs.get());
|
|
}
|
|
|
|
|
|
#ifdef HAVE_CPP_TROUBLE_COMPARING_TO_ZERO
|
|
|
|
// We need to explicitly define comparison operators for `int'
|
|
// because the compiler is lame.
|
|
|
|
template <class T>
|
|
inline
|
|
bool
|
|
operator==( const nsAutoArrayPtr<T>& lhs, int rhs )
|
|
// specifically to allow |smartPtr == 0|
|
|
{
|
|
return static_cast<const void*>(lhs.get()) == reinterpret_cast<const void*>(rhs);
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
bool
|
|
operator==( int lhs, const nsAutoArrayPtr<T>& rhs )
|
|
// specifically to allow |0 == smartPtr|
|
|
{
|
|
return reinterpret_cast<const void*>(lhs) == static_cast<const void*>(rhs.get());
|
|
}
|
|
|
|
#endif // !defined(HAVE_CPP_TROUBLE_COMPARING_TO_ZERO)
|
|
|
|
|
|
/*****************************************************************************/
|
|
|
|
// template <class T> class nsRefPtrGetterAddRefs;
|
|
|
|
template <class T>
|
|
class nsRefPtr
|
|
{
|
|
private:
|
|
|
|
void
|
|
assign_with_AddRef( T* rawPtr )
|
|
{
|
|
if ( rawPtr )
|
|
rawPtr->AddRef();
|
|
assign_assuming_AddRef(rawPtr);
|
|
}
|
|
|
|
void**
|
|
begin_assignment()
|
|
{
|
|
assign_assuming_AddRef(0);
|
|
return reinterpret_cast<void**>(&mRawPtr);
|
|
}
|
|
|
|
void
|
|
assign_assuming_AddRef( T* newPtr )
|
|
{
|
|
T* oldPtr = mRawPtr;
|
|
mRawPtr = newPtr;
|
|
if ( oldPtr )
|
|
oldPtr->Release();
|
|
}
|
|
|
|
private:
|
|
T* mRawPtr;
|
|
|
|
public:
|
|
typedef T element_type;
|
|
|
|
~nsRefPtr()
|
|
{
|
|
if ( mRawPtr )
|
|
mRawPtr->Release();
|
|
}
|
|
|
|
// Constructors
|
|
|
|
nsRefPtr()
|
|
: mRawPtr(0)
|
|
// default constructor
|
|
{
|
|
}
|
|
|
|
nsRefPtr( const nsRefPtr<T>& aSmartPtr )
|
|
: mRawPtr(aSmartPtr.mRawPtr)
|
|
// copy-constructor
|
|
{
|
|
if ( mRawPtr )
|
|
mRawPtr->AddRef();
|
|
}
|
|
|
|
nsRefPtr( T* aRawPtr )
|
|
: mRawPtr(aRawPtr)
|
|
// construct from a raw pointer (of the right type)
|
|
{
|
|
if ( mRawPtr )
|
|
mRawPtr->AddRef();
|
|
}
|
|
|
|
template <typename I>
|
|
nsRefPtr( already_AddRefed<I>& aSmartPtr )
|
|
: mRawPtr(aSmartPtr.take())
|
|
// construct from |already_AddRefed|
|
|
{
|
|
}
|
|
|
|
template <typename I>
|
|
nsRefPtr( already_AddRefed<I>&& aSmartPtr )
|
|
: mRawPtr(aSmartPtr.take())
|
|
// construct from |otherRefPtr.forget()|
|
|
{
|
|
}
|
|
|
|
nsRefPtr( const nsCOMPtr_helper& helper )
|
|
{
|
|
void* newRawPtr;
|
|
if (NS_FAILED(helper(NS_GET_TEMPLATE_IID(T), &newRawPtr)))
|
|
newRawPtr = 0;
|
|
mRawPtr = static_cast<T*>(newRawPtr);
|
|
}
|
|
|
|
// Assignment operators
|
|
|
|
nsRefPtr<T>&
|
|
operator=( const nsRefPtr<T>& rhs )
|
|
// copy assignment operator
|
|
{
|
|
assign_with_AddRef(rhs.mRawPtr);
|
|
return *this;
|
|
}
|
|
|
|
nsRefPtr<T>&
|
|
operator=( T* rhs )
|
|
// assign from a raw pointer (of the right type)
|
|
{
|
|
assign_with_AddRef(rhs);
|
|
return *this;
|
|
}
|
|
|
|
template <typename I>
|
|
nsRefPtr<T>&
|
|
operator=( already_AddRefed<I>& rhs )
|
|
// assign from |already_AddRefed|
|
|
{
|
|
assign_assuming_AddRef(rhs.take());
|
|
return *this;
|
|
}
|
|
|
|
template <typename I>
|
|
nsRefPtr<T>&
|
|
operator=( already_AddRefed<I>&& rhs )
|
|
// assign from |otherRefPtr.forget()|
|
|
{
|
|
assign_assuming_AddRef(rhs.take());
|
|
return *this;
|
|
}
|
|
|
|
nsRefPtr<T>&
|
|
operator=( const nsCOMPtr_helper& helper )
|
|
{
|
|
void* newRawPtr;
|
|
if (NS_FAILED(helper(NS_GET_TEMPLATE_IID(T), &newRawPtr)))
|
|
newRawPtr = 0;
|
|
assign_assuming_AddRef(static_cast<T*>(newRawPtr));
|
|
return *this;
|
|
}
|
|
|
|
// Other pointer operators
|
|
|
|
void
|
|
swap( nsRefPtr<T>& rhs )
|
|
// ...exchange ownership with |rhs|; can save a pair of refcount operations
|
|
{
|
|
T* temp = rhs.mRawPtr;
|
|
rhs.mRawPtr = mRawPtr;
|
|
mRawPtr = temp;
|
|
}
|
|
|
|
void
|
|
swap( T*& rhs )
|
|
// ...exchange ownership with |rhs|; can save a pair of refcount operations
|
|
{
|
|
T* temp = rhs;
|
|
rhs = mRawPtr;
|
|
mRawPtr = temp;
|
|
}
|
|
|
|
already_AddRefed<T>
|
|
forget()
|
|
// return the value of mRawPtr and null out mRawPtr. Useful for
|
|
// already_AddRefed return values.
|
|
{
|
|
T* temp = 0;
|
|
swap(temp);
|
|
return already_AddRefed<T>(temp);
|
|
}
|
|
|
|
template <typename I>
|
|
void
|
|
forget( I** rhs)
|
|
// Set the target of rhs to the value of mRawPtr and null out mRawPtr.
|
|
// Useful to avoid unnecessary AddRef/Release pairs with "out"
|
|
// parameters where rhs bay be a T** or an I** where I is a base class
|
|
// of T.
|
|
{
|
|
NS_ASSERTION(rhs, "Null pointer passed to forget!");
|
|
*rhs = mRawPtr;
|
|
mRawPtr = 0;
|
|
}
|
|
|
|
T*
|
|
get() const
|
|
/*
|
|
Prefer the implicit conversion provided automatically by |operator T*() const|.
|
|
Use |get()| to resolve ambiguity or to get a castable pointer.
|
|
*/
|
|
{
|
|
return const_cast<T*>(mRawPtr);
|
|
}
|
|
|
|
operator T*() const
|
|
/*
|
|
...makes an |nsRefPtr| act like its underlying raw pointer type whenever it
|
|
is used in a context where a raw pointer is expected. It is this operator
|
|
that makes an |nsRefPtr| substitutable for a raw pointer.
|
|
|
|
Prefer the implicit use of this operator to calling |get()|, except where
|
|
necessary to resolve ambiguity.
|
|
*/
|
|
{
|
|
return get();
|
|
}
|
|
|
|
T*
|
|
operator->() const
|
|
{
|
|
NS_PRECONDITION(mRawPtr != 0, "You can't dereference a NULL nsRefPtr with operator->().");
|
|
return get();
|
|
}
|
|
|
|
// This operator is needed for gcc <= 4.0.* and for Sun Studio; it
|
|
// causes internal compiler errors for some MSVC versions. (It's not
|
|
// clear to me whether it should be needed.)
|
|
#ifndef _MSC_VER
|
|
template <class U, class V>
|
|
U&
|
|
operator->*(U V::* aMember)
|
|
{
|
|
NS_PRECONDITION(mRawPtr != 0, "You can't dereference a NULL nsRefPtr with operator->*().");
|
|
return get()->*aMember;
|
|
}
|
|
#endif
|
|
|
|
nsRefPtr<T>*
|
|
get_address()
|
|
// This is not intended to be used by clients. See |address_of|
|
|
// below.
|
|
{
|
|
return this;
|
|
}
|
|
|
|
const nsRefPtr<T>*
|
|
get_address() const
|
|
// This is not intended to be used by clients. See |address_of|
|
|
// below.
|
|
{
|
|
return this;
|
|
}
|
|
|
|
public:
|
|
T&
|
|
operator*() const
|
|
{
|
|
NS_PRECONDITION(mRawPtr != 0, "You can't dereference a NULL nsRefPtr with operator*().");
|
|
return *get();
|
|
}
|
|
|
|
T**
|
|
StartAssignment()
|
|
{
|
|
#ifndef NSCAP_FEATURE_INLINE_STARTASSIGNMENT
|
|
return reinterpret_cast<T**>(begin_assignment());
|
|
#else
|
|
assign_assuming_AddRef(0);
|
|
return reinterpret_cast<T**>(&mRawPtr);
|
|
#endif
|
|
}
|
|
};
|
|
|
|
template <typename T>
|
|
inline void
|
|
ImplCycleCollectionUnlink(nsRefPtr<T>& aField)
|
|
{
|
|
aField = nullptr;
|
|
}
|
|
|
|
template <typename T>
|
|
inline void
|
|
ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
|
|
nsRefPtr<T>& aField,
|
|
const char* aName,
|
|
uint32_t aFlags = 0)
|
|
{
|
|
CycleCollectionNoteChild(aCallback, aField.get(), aName, aFlags);
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
nsRefPtr<T>*
|
|
address_of( nsRefPtr<T>& aPtr )
|
|
{
|
|
return aPtr.get_address();
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
const nsRefPtr<T>*
|
|
address_of( const nsRefPtr<T>& aPtr )
|
|
{
|
|
return aPtr.get_address();
|
|
}
|
|
|
|
template <class T>
|
|
class nsRefPtrGetterAddRefs
|
|
/*
|
|
...
|
|
|
|
This class is designed to be used for anonymous temporary objects in the
|
|
argument list of calls that return COM interface pointers, e.g.,
|
|
|
|
nsRefPtr<IFoo> fooP;
|
|
...->GetAddRefedPointer(getter_AddRefs(fooP))
|
|
|
|
DO NOT USE THIS TYPE DIRECTLY IN YOUR CODE. Use |getter_AddRefs()| instead.
|
|
|
|
When initialized with a |nsRefPtr|, as in the example above, it returns
|
|
a |void**|, a |T**|, or an |nsISupports**| as needed, that the
|
|
outer call (|GetAddRefedPointer| in this case) can fill in.
|
|
|
|
This type should be a nested class inside |nsRefPtr<T>|.
|
|
*/
|
|
{
|
|
public:
|
|
explicit
|
|
nsRefPtrGetterAddRefs( nsRefPtr<T>& aSmartPtr )
|
|
: mTargetSmartPtr(aSmartPtr)
|
|
{
|
|
// nothing else to do
|
|
}
|
|
|
|
operator void**()
|
|
{
|
|
return reinterpret_cast<void**>(mTargetSmartPtr.StartAssignment());
|
|
}
|
|
|
|
operator T**()
|
|
{
|
|
return mTargetSmartPtr.StartAssignment();
|
|
}
|
|
|
|
T*&
|
|
operator*()
|
|
{
|
|
return *(mTargetSmartPtr.StartAssignment());
|
|
}
|
|
|
|
private:
|
|
nsRefPtr<T>& mTargetSmartPtr;
|
|
};
|
|
|
|
template <class T>
|
|
inline
|
|
nsRefPtrGetterAddRefs<T>
|
|
getter_AddRefs( nsRefPtr<T>& aSmartPtr )
|
|
/*
|
|
Used around a |nsRefPtr| when
|
|
...makes the class |nsRefPtrGetterAddRefs<T>| invisible.
|
|
*/
|
|
{
|
|
return nsRefPtrGetterAddRefs<T>(aSmartPtr);
|
|
}
|
|
|
|
|
|
|
|
// Comparing two |nsRefPtr|s
|
|
|
|
template <class T, class U>
|
|
inline
|
|
bool
|
|
operator==( const nsRefPtr<T>& lhs, const nsRefPtr<U>& rhs )
|
|
{
|
|
return static_cast<const T*>(lhs.get()) == static_cast<const U*>(rhs.get());
|
|
}
|
|
|
|
|
|
template <class T, class U>
|
|
inline
|
|
bool
|
|
operator!=( const nsRefPtr<T>& lhs, const nsRefPtr<U>& rhs )
|
|
{
|
|
return static_cast<const T*>(lhs.get()) != static_cast<const U*>(rhs.get());
|
|
}
|
|
|
|
|
|
// Comparing an |nsRefPtr| to a raw pointer
|
|
|
|
template <class T, class U>
|
|
inline
|
|
bool
|
|
operator==( const nsRefPtr<T>& lhs, const U* rhs )
|
|
{
|
|
return static_cast<const T*>(lhs.get()) == static_cast<const U*>(rhs);
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
bool
|
|
operator==( const U* lhs, const nsRefPtr<T>& rhs )
|
|
{
|
|
return static_cast<const U*>(lhs) == static_cast<const T*>(rhs.get());
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
bool
|
|
operator!=( const nsRefPtr<T>& lhs, const U* rhs )
|
|
{
|
|
return static_cast<const T*>(lhs.get()) != static_cast<const U*>(rhs);
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
bool
|
|
operator!=( const U* lhs, const nsRefPtr<T>& rhs )
|
|
{
|
|
return static_cast<const U*>(lhs) != static_cast<const T*>(rhs.get());
|
|
}
|
|
|
|
// To avoid ambiguities caused by the presence of builtin |operator==|s
|
|
// creating a situation where one of the |operator==| defined above
|
|
// has a better conversion for one argument and the builtin has a
|
|
// better conversion for the other argument, define additional
|
|
// |operator==| without the |const| on the raw pointer.
|
|
// See bug 65664 for details.
|
|
|
|
#ifndef NSCAP_DONT_PROVIDE_NONCONST_OPEQ
|
|
template <class T, class U>
|
|
inline
|
|
bool
|
|
operator==( const nsRefPtr<T>& lhs, U* rhs )
|
|
{
|
|
return static_cast<const T*>(lhs.get()) == const_cast<const U*>(rhs);
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
bool
|
|
operator==( U* lhs, const nsRefPtr<T>& rhs )
|
|
{
|
|
return const_cast<const U*>(lhs) == static_cast<const T*>(rhs.get());
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
bool
|
|
operator!=( const nsRefPtr<T>& lhs, U* rhs )
|
|
{
|
|
return static_cast<const T*>(lhs.get()) != const_cast<const U*>(rhs);
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
bool
|
|
operator!=( U* lhs, const nsRefPtr<T>& rhs )
|
|
{
|
|
return const_cast<const U*>(lhs) != static_cast<const T*>(rhs.get());
|
|
}
|
|
#endif
|
|
|
|
|
|
|
|
// Comparing an |nsRefPtr| to |0|
|
|
|
|
template <class T>
|
|
inline
|
|
bool
|
|
operator==( const nsRefPtr<T>& lhs, NSCAP_Zero* rhs )
|
|
// specifically to allow |smartPtr == 0|
|
|
{
|
|
return static_cast<const void*>(lhs.get()) == reinterpret_cast<const void*>(rhs);
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
bool
|
|
operator==( NSCAP_Zero* lhs, const nsRefPtr<T>& rhs )
|
|
// specifically to allow |0 == smartPtr|
|
|
{
|
|
return reinterpret_cast<const void*>(lhs) == static_cast<const void*>(rhs.get());
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
bool
|
|
operator!=( const nsRefPtr<T>& lhs, NSCAP_Zero* rhs )
|
|
// specifically to allow |smartPtr != 0|
|
|
{
|
|
return static_cast<const void*>(lhs.get()) != reinterpret_cast<const void*>(rhs);
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
bool
|
|
operator!=( NSCAP_Zero* lhs, const nsRefPtr<T>& rhs )
|
|
// specifically to allow |0 != smartPtr|
|
|
{
|
|
return reinterpret_cast<const void*>(lhs) != static_cast<const void*>(rhs.get());
|
|
}
|
|
|
|
|
|
#ifdef HAVE_CPP_TROUBLE_COMPARING_TO_ZERO
|
|
|
|
// We need to explicitly define comparison operators for `int'
|
|
// because the compiler is lame.
|
|
|
|
template <class T>
|
|
inline
|
|
bool
|
|
operator==( const nsRefPtr<T>& lhs, int rhs )
|
|
// specifically to allow |smartPtr == 0|
|
|
{
|
|
return static_cast<const void*>(lhs.get()) == reinterpret_cast<const void*>(rhs);
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
bool
|
|
operator==( int lhs, const nsRefPtr<T>& rhs )
|
|
// specifically to allow |0 == smartPtr|
|
|
{
|
|
return reinterpret_cast<const void*>(lhs) == static_cast<const void*>(rhs.get());
|
|
}
|
|
|
|
#endif // !defined(HAVE_CPP_TROUBLE_COMPARING_TO_ZERO)
|
|
|
|
template <class SourceType, class DestinationType>
|
|
inline
|
|
nsresult
|
|
CallQueryInterface( nsRefPtr<SourceType>& aSourcePtr, DestinationType** aDestPtr )
|
|
{
|
|
return CallQueryInterface(aSourcePtr.get(), aDestPtr);
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
|
|
template<class T>
|
|
class nsQueryObject : public nsCOMPtr_helper
|
|
{
|
|
public:
|
|
nsQueryObject(T* aRawPtr)
|
|
: mRawPtr(aRawPtr) {}
|
|
|
|
virtual nsresult NS_FASTCALL operator()( const nsIID& aIID, void** aResult ) const {
|
|
nsresult status = mRawPtr ? mRawPtr->QueryInterface(aIID, aResult)
|
|
: NS_ERROR_NULL_POINTER;
|
|
return status;
|
|
}
|
|
private:
|
|
T* mRawPtr;
|
|
};
|
|
|
|
template<class T>
|
|
class nsQueryObjectWithError : public nsCOMPtr_helper
|
|
{
|
|
public:
|
|
nsQueryObjectWithError(T* aRawPtr, nsresult* aErrorPtr)
|
|
: mRawPtr(aRawPtr), mErrorPtr(aErrorPtr) {}
|
|
|
|
virtual nsresult NS_FASTCALL operator()( const nsIID& aIID, void** aResult ) const {
|
|
nsresult status = mRawPtr ? mRawPtr->QueryInterface(aIID, aResult)
|
|
: NS_ERROR_NULL_POINTER;
|
|
if (mErrorPtr)
|
|
*mErrorPtr = status;
|
|
return status;
|
|
}
|
|
private:
|
|
T* mRawPtr;
|
|
nsresult* mErrorPtr;
|
|
};
|
|
|
|
template<class T>
|
|
inline
|
|
nsQueryObject<T>
|
|
do_QueryObject(T* aRawPtr)
|
|
{
|
|
return nsQueryObject<T>(aRawPtr);
|
|
}
|
|
|
|
template<class T>
|
|
inline
|
|
nsQueryObject<T>
|
|
do_QueryObject(nsCOMPtr<T>& aRawPtr)
|
|
{
|
|
return nsQueryObject<T>(aRawPtr);
|
|
}
|
|
|
|
template<class T>
|
|
inline
|
|
nsQueryObject<T>
|
|
do_QueryObject(nsRefPtr<T>& aRawPtr)
|
|
{
|
|
return nsQueryObject<T>(aRawPtr);
|
|
}
|
|
|
|
template<class T>
|
|
inline
|
|
nsQueryObjectWithError<T>
|
|
do_QueryObject(T* aRawPtr, nsresult* aErrorPtr)
|
|
{
|
|
return nsQueryObjectWithError<T>(aRawPtr, aErrorPtr);
|
|
}
|
|
|
|
template<class T>
|
|
inline
|
|
nsQueryObjectWithError<T>
|
|
do_QueryObject(nsCOMPtr<T>& aRawPtr, nsresult* aErrorPtr)
|
|
{
|
|
return nsQueryObjectWithError<T>(aRawPtr, aErrorPtr);
|
|
}
|
|
|
|
template<class T>
|
|
inline
|
|
nsQueryObjectWithError<T>
|
|
do_QueryObject(nsRefPtr<T>& aRawPtr, nsresult* aErrorPtr)
|
|
{
|
|
return nsQueryObjectWithError<T>(aRawPtr, aErrorPtr);
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
|
|
#endif // !defined(nsAutoPtr_h___)
|