зеркало из https://github.com/mozilla/pjs.git
1415 строки
35 KiB
C++
1415 строки
35 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: NPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Scott Collins <scc@mozilla.org> (original author of nsCOMPtr)
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* L. David Baron <dbaron@dbaron.org>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the NPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the NPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsAutoPtr_h___
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#define nsAutoPtr_h___
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// Wrapping includes can speed up compiles (see "Large Scale C++ Software Design")
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#ifndef nsCOMPtr_h___
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// For |already_AddRefed|, |nsDerivedSafe|, |NSCAP_Zero|.
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#include "nsCOMPtr.h"
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#endif
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#ifdef _MSC_VER
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#define NSCAP_FEATURE_INLINE_STARTASSIGNMENT
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// under VC++, we win by inlining StartAssignment
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// Also under VC++, at the highest warning level, we are overwhelmed with warnings
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// about (unused) inline functions being removed. This is to be expected with
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// templates, so we disable the warning.
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#pragma warning( disable: 4514 )
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#endif
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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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enum { _force_even_compliant_compilers_to_fail_ = sizeof(T) };
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/*
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The declaration above exists specifically to make |nsAutoPtr<T>|
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_not_ compile with only a forward declaration of |T|. This
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should prevent Windows and Mac engineers from breaking Solaris
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and other compilers that naturally have this behavior. Thank
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<law@netscape.com> for inventing this specific trick.
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Of course, if you're using |nsAutoPtr| outside the scope of
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wanting to compile on Solaris and old GCC, you probably want to
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remove the enum so you can exploit forward declarations.
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*/
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private:
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void** begin_assignment();
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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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~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( 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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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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#ifdef CANT_RESOLVE_CPP_CONST_AMBIGUITY
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// broken version for IRIX
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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 NS_CONST_CAST(nsAutoPtr<T>*, this);
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}
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#else // CANT_RESOLVE_CPP_CONST_AMBIGUITY
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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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#endif // CANT_RESOLVE_CPP_CONST_AMBIGUITY
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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 NS_REINTERPRET_CAST(T**, begin_assignment());
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#else
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assign(0);
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return NS_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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void**
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nsAutoPtr<T>::begin_assignment()
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{
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assign(0);
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return NS_REINTERPRET_CAST(void**, &mRawPtr);
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}
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#ifdef CANT_RESOLVE_CPP_CONST_AMBIGUITY
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// This is the broken version for IRIX, which can't handle the version below.
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template <class T>
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inline
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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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#else // CANT_RESOLVE_CPP_CONST_AMBIGUITY
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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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#endif // CANT_RESOLVE_CPP_CONST_AMBIGUITY
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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 NS_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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NSCAP_BOOL
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operator==( const nsAutoPtr<T>& lhs, const nsAutoPtr<U>& rhs )
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{
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return NS_STATIC_CAST(const T*, lhs.get()) == NS_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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NSCAP_BOOL
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operator!=( const nsAutoPtr<T>& lhs, const nsAutoPtr<U>& rhs )
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{
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return NS_STATIC_CAST(const T*, lhs.get()) != NS_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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NSCAP_BOOL
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operator==( const nsAutoPtr<T>& lhs, const U* rhs )
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{
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return NS_STATIC_CAST(const T*, lhs.get()) == NS_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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NSCAP_BOOL
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operator==( const U* lhs, const nsAutoPtr<T>& rhs )
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{
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return NS_STATIC_CAST(const U*, lhs) == NS_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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NSCAP_BOOL
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operator!=( const nsAutoPtr<T>& lhs, const U* rhs )
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{
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return NS_STATIC_CAST(const T*, lhs.get()) != NS_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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NSCAP_BOOL
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operator!=( const U* lhs, const nsAutoPtr<T>& rhs )
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{
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return NS_STATIC_CAST(const U*, lhs) != NS_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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// This is defined by an autoconf test, but VC++ also has a bug that
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// prevents us from using these. (It also, fortunately, has the bug
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// that we don't need them either.)
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#ifdef _MSC_VER
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#define NSCAP_DONT_PROVIDE_NONCONST_OPEQ
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#endif
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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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NSCAP_BOOL
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operator==( const nsAutoPtr<T>& lhs, U* rhs )
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{
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return NS_STATIC_CAST(const T*, lhs.get()) == NS_STATIC_CAST(U*, rhs);
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}
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template <class T, class U>
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inline
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NSCAP_BOOL
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operator==( U* lhs, const nsAutoPtr<T>& rhs )
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{
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return NS_STATIC_CAST(U*, lhs) == NS_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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NSCAP_BOOL
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operator!=( const nsAutoPtr<T>& lhs, U* rhs )
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{
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return NS_STATIC_CAST(const T*, lhs.get()) != NS_STATIC_CAST(U*, rhs);
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}
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template <class T, class U>
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inline
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NSCAP_BOOL
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operator!=( U* lhs, const nsAutoPtr<T>& rhs )
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{
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return NS_STATIC_CAST(U*, lhs) != NS_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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NSCAP_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 NS_STATIC_CAST(const void*, lhs.get()) == NS_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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NSCAP_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 NS_REINTERPRET_CAST(const void*, lhs) == NS_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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NSCAP_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 NS_STATIC_CAST(const void*, lhs.get()) != NS_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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NSCAP_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 NS_REINTERPRET_CAST(const void*, lhs) != NS_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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NSCAP_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 NS_STATIC_CAST(const void*, lhs.get()) == NS_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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NSCAP_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 NS_REINTERPRET_CAST(const void*, lhs) == NS_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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|
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template <class T>
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class nsAutoArrayPtr
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{
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enum { _force_even_compliant_compilers_to_fail_ = sizeof(T) };
|
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/*
|
|
The declaration above exists specifically to make |nsAutoArrayPtr<T>|
|
|
_not_ compile with only a forward declaration of |T|. This
|
|
should prevent Windows and Mac engineers from breaking Solaris
|
|
and other compilers that naturally have this behavior. Thank
|
|
<law@netscape.com> for inventing this specific trick.
|
|
|
|
Of course, if you're using |nsAutoArrayPtr| outside the scope of
|
|
wanting to compile on Solaris and old GCC, you probably want to
|
|
remove the enum so you can exploit forward declarations.
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|
*/
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|
private:
|
|
void** begin_assignment();
|
|
|
|
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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|
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private:
|
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T* mRawPtr;
|
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|
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public:
|
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typedef T element_type;
|
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|
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~nsAutoArrayPtr()
|
|
{
|
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delete [] mRawPtr;
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}
|
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|
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// Constructors
|
|
|
|
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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|
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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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|
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nsAutoArrayPtr( nsAutoArrayPtr<T>& aSmartPtr )
|
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: mRawPtr( aSmartPtr.forget() )
|
|
// Construct by transferring ownership from another smart pointer.
|
|
{
|
|
}
|
|
|
|
|
|
// Assignment operators
|
|
|
|
nsAutoArrayPtr<T>&
|
|
operator=( T* rhs )
|
|
// assign from a raw pointer (of the right type)
|
|
{
|
|
assign(rhs);
|
|
return *this;
|
|
}
|
|
|
|
nsAutoArrayPtr<T>& operator=( const nsAutoArrayPtr<T>& rhs )
|
|
// assign by transferring ownership from another smart pointer.
|
|
{
|
|
assign(rhs.forget());
|
|
return *this;
|
|
}
|
|
|
|
// Other pointer operators
|
|
|
|
T*
|
|
get() const
|
|
/*
|
|
Prefer the implicit conversion provided automatically by
|
|
|operator T*() const|. Use |get()| _only_ to resolve
|
|
ambiguity.
|
|
*/
|
|
{
|
|
return mRawPtr;
|
|
}
|
|
|
|
operator T*() const
|
|
/*
|
|
...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.
|
|
*/
|
|
{
|
|
return get();
|
|
}
|
|
|
|
T*
|
|
forget()
|
|
{
|
|
T* temp = mRawPtr;
|
|
mRawPtr = 0;
|
|
return temp;
|
|
}
|
|
|
|
T*
|
|
operator->() const
|
|
{
|
|
NS_PRECONDITION(mRawPtr != 0, "You can't dereference a NULL nsAutoArrayPtr with operator->().");
|
|
return get();
|
|
}
|
|
|
|
#ifdef CANT_RESOLVE_CPP_CONST_AMBIGUITY
|
|
// broken version for IRIX
|
|
|
|
nsAutoArrayPtr<T>*
|
|
get_address() const
|
|
// This is not intended to be used by clients. See |address_of|
|
|
// below.
|
|
{
|
|
return NS_CONST_CAST(nsAutoArrayPtr<T>*, this);
|
|
}
|
|
|
|
#else // CANT_RESOLVE_CPP_CONST_AMBIGUITY
|
|
|
|
nsAutoArrayPtr<T>*
|
|
get_address()
|
|
// This is not intended to be used by clients. See |address_of|
|
|
// below.
|
|
{
|
|
return this;
|
|
}
|
|
|
|
const nsAutoArrayPtr<T>*
|
|
get_address() const
|
|
// This is not intended to be used by clients. See |address_of|
|
|
// below.
|
|
{
|
|
return this;
|
|
}
|
|
|
|
#endif // CANT_RESOLVE_CPP_CONST_AMBIGUITY
|
|
|
|
public:
|
|
T&
|
|
operator*() const
|
|
{
|
|
NS_PRECONDITION(mRawPtr != 0, "You can't dereference a NULL nsAutoArrayPtr with operator*().");
|
|
return *get();
|
|
}
|
|
|
|
T**
|
|
StartAssignment()
|
|
{
|
|
#ifndef NSCAP_FEATURE_INLINE_STARTASSIGNMENT
|
|
return NS_REINTERPRET_CAST(T**, begin_assignment());
|
|
#else
|
|
assign(0);
|
|
return NS_REINTERPRET_CAST(T**, &mRawPtr);
|
|
#endif
|
|
}
|
|
};
|
|
|
|
template <class T>
|
|
void**
|
|
nsAutoArrayPtr<T>::begin_assignment()
|
|
{
|
|
assign(0);
|
|
return NS_REINTERPRET_CAST(void**, &mRawPtr);
|
|
}
|
|
|
|
#ifdef CANT_RESOLVE_CPP_CONST_AMBIGUITY
|
|
|
|
// This is the broken version for IRIX, which can't handle the version below.
|
|
|
|
template <class T>
|
|
inline
|
|
nsAutoArrayPtr<T>*
|
|
address_of( const nsAutoArrayPtr<T>& aPtr )
|
|
{
|
|
return aPtr.get_address();
|
|
}
|
|
|
|
#else // CANT_RESOLVE_CPP_CONST_AMBIGUITY
|
|
|
|
template <class T>
|
|
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();
|
|
}
|
|
|
|
#endif // CANT_RESOLVE_CPP_CONST_AMBIGUITY
|
|
|
|
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 NS_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
|
|
NSCAP_BOOL
|
|
operator==( const nsAutoArrayPtr<T>& lhs, const nsAutoArrayPtr<U>& rhs )
|
|
{
|
|
return NS_STATIC_CAST(const T*, lhs.get()) == NS_STATIC_CAST(const U*, rhs.get());
|
|
}
|
|
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( const nsAutoArrayPtr<T>& lhs, const nsAutoArrayPtr<U>& rhs )
|
|
{
|
|
return NS_STATIC_CAST(const T*, lhs.get()) != NS_STATIC_CAST(const U*, rhs.get());
|
|
}
|
|
|
|
|
|
// Comparing an |nsAutoArrayPtr| to a raw pointer
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( const nsAutoArrayPtr<T>& lhs, const U* rhs )
|
|
{
|
|
return NS_STATIC_CAST(const T*, lhs.get()) == NS_STATIC_CAST(const U*, rhs);
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( const U* lhs, const nsAutoArrayPtr<T>& rhs )
|
|
{
|
|
return NS_STATIC_CAST(const U*, lhs) == NS_STATIC_CAST(const T*, rhs.get());
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( const nsAutoArrayPtr<T>& lhs, const U* rhs )
|
|
{
|
|
return NS_STATIC_CAST(const T*, lhs.get()) != NS_STATIC_CAST(const U*, rhs);
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( const U* lhs, const nsAutoArrayPtr<T>& rhs )
|
|
{
|
|
return NS_STATIC_CAST(const U*, lhs) != NS_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.
|
|
|
|
// This is defined by an autoconf test, but VC++ also has a bug that
|
|
// prevents us from using these. (It also, fortunately, has the bug
|
|
// that we don't need them either.)
|
|
#ifdef _MSC_VER
|
|
#define NSCAP_DONT_PROVIDE_NONCONST_OPEQ
|
|
#endif
|
|
|
|
#ifndef NSCAP_DONT_PROVIDE_NONCONST_OPEQ
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( const nsAutoArrayPtr<T>& lhs, U* rhs )
|
|
{
|
|
return NS_STATIC_CAST(const T*, lhs.get()) == NS_STATIC_CAST(U*, rhs);
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( U* lhs, const nsAutoArrayPtr<T>& rhs )
|
|
{
|
|
return NS_STATIC_CAST(U*, lhs) == NS_STATIC_CAST(const T*, rhs.get());
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( const nsAutoArrayPtr<T>& lhs, U* rhs )
|
|
{
|
|
return NS_STATIC_CAST(const T*, lhs.get()) != NS_STATIC_CAST(U*, rhs);
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( U* lhs, const nsAutoArrayPtr<T>& rhs )
|
|
{
|
|
return NS_STATIC_CAST(U*, lhs) != NS_STATIC_CAST(const T*, rhs.get());
|
|
}
|
|
#endif
|
|
|
|
|
|
|
|
// Comparing an |nsAutoArrayPtr| to |0|
|
|
|
|
template <class T>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( const nsAutoArrayPtr<T>& lhs, NSCAP_Zero* rhs )
|
|
// specifically to allow |smartPtr == 0|
|
|
{
|
|
return NS_STATIC_CAST(const void*, lhs.get()) == NS_REINTERPRET_CAST(const void*, rhs);
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( NSCAP_Zero* lhs, const nsAutoArrayPtr<T>& rhs )
|
|
// specifically to allow |0 == smartPtr|
|
|
{
|
|
return NS_REINTERPRET_CAST(const void*, lhs) == NS_STATIC_CAST(const void*, rhs.get());
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( const nsAutoArrayPtr<T>& lhs, NSCAP_Zero* rhs )
|
|
// specifically to allow |smartPtr != 0|
|
|
{
|
|
return NS_STATIC_CAST(const void*, lhs.get()) != NS_REINTERPRET_CAST(const void*, rhs);
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( NSCAP_Zero* lhs, const nsAutoArrayPtr<T>& rhs )
|
|
// specifically to allow |0 != smartPtr|
|
|
{
|
|
return NS_REINTERPRET_CAST(const void*, lhs) != NS_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
|
|
NSCAP_BOOL
|
|
operator==( const nsAutoArrayPtr<T>& lhs, int rhs )
|
|
// specifically to allow |smartPtr == 0|
|
|
{
|
|
return NS_STATIC_CAST(const void*, lhs.get()) == NS_REINTERPRET_CAST(const void*, rhs);
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( int lhs, const nsAutoArrayPtr<T>& rhs )
|
|
// specifically to allow |0 == smartPtr|
|
|
{
|
|
return NS_REINTERPRET_CAST(const void*, lhs) == NS_STATIC_CAST(const void*, rhs.get());
|
|
}
|
|
|
|
#endif // !defined(HAVE_CPP_TROUBLE_COMPARING_TO_ZERO)
|
|
|
|
|
|
/*****************************************************************************/
|
|
|
|
// template <class T> class nsRefPtrGetterAddRefs;
|
|
|
|
template <class T>
|
|
class nsRefPtr
|
|
{
|
|
enum { _force_even_compliant_compilers_to_fail_ = sizeof(T) };
|
|
/*
|
|
The declaration above exists specifically to make |nsRefPtr<T>|
|
|
_not_ compile with only a forward declaration of |T|. This
|
|
should prevent Windows and Mac engineers from breaking Solaris
|
|
and other compilers that naturally have this behavior. Thank
|
|
<law@netscape.com> for inventing this specific trick.
|
|
|
|
Of course, if you're using |nsRefPtr| outside the scope of
|
|
wanting to compile on Solaris and old GCC, you probably want to
|
|
remove the enum so you can exploit forward declarations.
|
|
*/
|
|
|
|
private:
|
|
void assign_with_AddRef( T* );
|
|
void** begin_assignment();
|
|
|
|
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();
|
|
}
|
|
|
|
nsRefPtr( const already_AddRefed<T>& aSmartPtr )
|
|
: mRawPtr(aSmartPtr.mRawPtr)
|
|
// construct from |dont_AddRef(expr)|
|
|
{
|
|
}
|
|
|
|
// 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;
|
|
}
|
|
|
|
nsRefPtr<T>&
|
|
operator=( const already_AddRefed<T>& rhs )
|
|
// assign from |dont_AddRef(expr)|
|
|
{
|
|
assign_assuming_AddRef(rhs.mRawPtr);
|
|
return *this;
|
|
}
|
|
|
|
// Other pointer operators
|
|
|
|
nsDerivedSafe<T>*
|
|
get() const
|
|
/*
|
|
Prefer the implicit conversion provided automatically by |operator nsDerivedSafe<T>*() const|.
|
|
Use |get()| _only_ to resolve ambiguity.
|
|
|
|
Returns a |nsDerivedSafe<T>*| to deny clients the use of |AddRef| and |Release|.
|
|
*/
|
|
{
|
|
return NS_CONST_CAST(nsDerivedSafe<T>*,
|
|
NS_REINTERPRET_CAST(const nsDerivedSafe<T>*, mRawPtr));
|
|
}
|
|
|
|
operator nsDerivedSafe<T>*() const
|
|
/*
|
|
...makes an |nsRefPtr| act like its underlying raw pointer type (except against |AddRef()|, |Release()|,
|
|
and |delete|) 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();
|
|
}
|
|
|
|
nsDerivedSafe<T>*
|
|
operator->() const
|
|
{
|
|
NS_PRECONDITION(mRawPtr != 0, "You can't dereference a NULL nsRefPtr with operator->().");
|
|
return get();
|
|
}
|
|
|
|
#ifdef CANT_RESOLVE_CPP_CONST_AMBIGUITY
|
|
// broken version for IRIX
|
|
|
|
nsRefPtr<T>*
|
|
get_address() const
|
|
// This is not intended to be used by clients. See |address_of|
|
|
// below.
|
|
{
|
|
return NS_CONST_CAST(nsRefPtr<T>*, this);
|
|
}
|
|
|
|
#else // CANT_RESOLVE_CPP_CONST_AMBIGUITY
|
|
|
|
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;
|
|
}
|
|
|
|
#endif // CANT_RESOLVE_CPP_CONST_AMBIGUITY
|
|
|
|
public:
|
|
nsDerivedSafe<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 NS_REINTERPRET_CAST(T**, begin_assignment());
|
|
#else
|
|
assign_assuming_AddRef(0);
|
|
return NS_REINTERPRET_CAST(T**, &mRawPtr);
|
|
#endif
|
|
}
|
|
};
|
|
|
|
template <class T>
|
|
void
|
|
nsRefPtr<T>::assign_with_AddRef( T* rawPtr )
|
|
{
|
|
if ( rawPtr )
|
|
rawPtr->AddRef();
|
|
assign_assuming_AddRef(rawPtr);
|
|
}
|
|
|
|
template <class T>
|
|
void**
|
|
nsRefPtr<T>::begin_assignment()
|
|
{
|
|
assign_assuming_AddRef(0);
|
|
return NS_REINTERPRET_CAST(void**, &mRawPtr);
|
|
}
|
|
|
|
#ifdef CANT_RESOLVE_CPP_CONST_AMBIGUITY
|
|
|
|
// This is the broken version for IRIX, which can't handle the version below.
|
|
|
|
template <class T>
|
|
inline
|
|
nsRefPtr<T>*
|
|
address_of( const nsRefPtr<T>& aPtr )
|
|
{
|
|
return aPtr.get_address();
|
|
}
|
|
|
|
#else // CANT_RESOLVE_CPP_CONST_AMBIGUITY
|
|
|
|
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();
|
|
}
|
|
|
|
#endif // CANT_RESOLVE_CPP_CONST_AMBIGUITY
|
|
|
|
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 NS_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
|
|
NSCAP_BOOL
|
|
operator==( const nsRefPtr<T>& lhs, const nsRefPtr<U>& rhs )
|
|
{
|
|
return NS_STATIC_CAST(const T*, lhs.get()) == NS_STATIC_CAST(const U*, rhs.get());
|
|
}
|
|
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( const nsRefPtr<T>& lhs, const nsRefPtr<U>& rhs )
|
|
{
|
|
return NS_STATIC_CAST(const T*, lhs.get()) != NS_STATIC_CAST(const U*, rhs.get());
|
|
}
|
|
|
|
|
|
// Comparing an |nsRefPtr| to a raw pointer
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( const nsRefPtr<T>& lhs, const U* rhs )
|
|
{
|
|
return NS_STATIC_CAST(const T*, lhs.get()) == NS_STATIC_CAST(const U*, rhs);
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( const U* lhs, const nsRefPtr<T>& rhs )
|
|
{
|
|
return NS_STATIC_CAST(const U*, lhs) == NS_STATIC_CAST(const T*, rhs.get());
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( const nsRefPtr<T>& lhs, const U* rhs )
|
|
{
|
|
return NS_STATIC_CAST(const T*, lhs.get()) != NS_STATIC_CAST(const U*, rhs);
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( const U* lhs, const nsRefPtr<T>& rhs )
|
|
{
|
|
return NS_STATIC_CAST(const U*, lhs) != NS_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.
|
|
|
|
// This is defined by an autoconf test, but VC++ also has a bug that
|
|
// prevents us from using these. (It also, fortunately, has the bug
|
|
// that we don't need them either.)
|
|
#ifdef _MSC_VER
|
|
#define NSCAP_DONT_PROVIDE_NONCONST_OPEQ
|
|
#endif
|
|
|
|
#ifndef NSCAP_DONT_PROVIDE_NONCONST_OPEQ
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( const nsRefPtr<T>& lhs, U* rhs )
|
|
{
|
|
return NS_STATIC_CAST(const T*, lhs.get()) == NS_STATIC_CAST(U*, rhs);
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( U* lhs, const nsRefPtr<T>& rhs )
|
|
{
|
|
return NS_STATIC_CAST(U*, lhs) == NS_STATIC_CAST(const T*, rhs.get());
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( const nsRefPtr<T>& lhs, U* rhs )
|
|
{
|
|
return NS_STATIC_CAST(const T*, lhs.get()) != NS_STATIC_CAST(U*, rhs);
|
|
}
|
|
|
|
template <class T, class U>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( U* lhs, const nsRefPtr<T>& rhs )
|
|
{
|
|
return NS_STATIC_CAST(U*, lhs) != NS_STATIC_CAST(const T*, rhs.get());
|
|
}
|
|
#endif
|
|
|
|
|
|
|
|
// Comparing an |nsRefPtr| to |0|
|
|
|
|
template <class T>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( const nsRefPtr<T>& lhs, NSCAP_Zero* rhs )
|
|
// specifically to allow |smartPtr == 0|
|
|
{
|
|
return NS_STATIC_CAST(const void*, lhs.get()) == NS_REINTERPRET_CAST(const void*, rhs);
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( NSCAP_Zero* lhs, const nsRefPtr<T>& rhs )
|
|
// specifically to allow |0 == smartPtr|
|
|
{
|
|
return NS_REINTERPRET_CAST(const void*, lhs) == NS_STATIC_CAST(const void*, rhs.get());
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( const nsRefPtr<T>& lhs, NSCAP_Zero* rhs )
|
|
// specifically to allow |smartPtr != 0|
|
|
{
|
|
return NS_STATIC_CAST(const void*, lhs.get()) != NS_REINTERPRET_CAST(const void*, rhs);
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator!=( NSCAP_Zero* lhs, const nsRefPtr<T>& rhs )
|
|
// specifically to allow |0 != smartPtr|
|
|
{
|
|
return NS_REINTERPRET_CAST(const void*, lhs) != NS_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
|
|
NSCAP_BOOL
|
|
operator==( const nsRefPtr<T>& lhs, int rhs )
|
|
// specifically to allow |smartPtr == 0|
|
|
{
|
|
return NS_STATIC_CAST(const void*, lhs.get()) == NS_REINTERPRET_CAST(const void*, rhs);
|
|
}
|
|
|
|
template <class T>
|
|
inline
|
|
NSCAP_BOOL
|
|
operator==( int lhs, const nsRefPtr<T>& rhs )
|
|
// specifically to allow |0 == smartPtr|
|
|
{
|
|
return NS_REINTERPRET_CAST(const void*, lhs) == NS_STATIC_CAST(const void*, rhs.get());
|
|
}
|
|
|
|
#endif // !defined(HAVE_CPP_TROUBLE_COMPARING_TO_ZERO)
|
|
|
|
/*****************************************************************************/
|
|
|
|
#endif // !defined(nsAutoPtr_h___)
|