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move nsDeque .h and .cpp from xpcom/ds to xpcom/glue. 

Bug 395349, r+a=bsmedberg
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aaronr%us.ibm.com 2007-09-18 18:14:35 +00:00
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Коммит 99dab3dec2
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1
xpcom/glue/Makefile.in
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@ -112,6 +112,7 @@ SDK_HEADERS = \
nsIClassInfoImpl.h \
nsTObserverArray.h \
nsCycleCollectionParticipant.h \
nsDeque.h \
$(NULL)
EXPORTS = \

625
xpcom/glue/nsDeque.cpp Normal file
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@ -0,0 +1,625 @@
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsDeque.h"
#include "nsCRT.h"
#ifdef DEBUG_rickg
#include <stdio.h>
#endif
/**
* 07/02/2001 09:17p 509,104 clangref.pdf from openwatcom's site
* Watcom C Language Reference Edition 11.0c
* page 118 of 297
*
* The % symbol yields the remainder from the division of the first operand
* by the second operand. The operands of % must have integral type.
*
* When both operands of % are positive, the result is a positive value
* smaller than the second operand. When one or both operands is negative,
* whether the result is positive or negative is implementation-defined.
*
*/
/* Ok, so first of all, C is underspecified. joy.
* The following functions do not provide a correct implementation of modulus
* They provide functionality for x>-y.
* There are risks of 2*y being greater than max int, which is part of the
* reason no multiplication is used and other operations are avoided.
*
* modasgn
* @param x variable
* @param y expression
* approximately equivalent to x %= y
*
* modulus
* @param x expression
* @param y expression
* approximately equivalent to x % y
*/
#define modasgn(x,y) if (x<0) x+=y; x%=y
#define modulus(x,y) ((x<0)?(x+y)%(y):(x)%(y))
/**
* Standard constructor
* @param deallocator, called by Erase and ~nsDeque
*/
nsDeque::nsDeque(nsDequeFunctor* aDeallocator) {
MOZ_COUNT_CTOR(nsDeque);
mDeallocator=aDeallocator;
mOrigin=mSize=0;
mData=mBuffer; // don't allocate space until you must
mCapacity=sizeof(mBuffer)/sizeof(mBuffer[0]);
memset(mData, 0, mCapacity*sizeof(mBuffer[0]));
}
/**
* Destructor
*/
nsDeque::~nsDeque() {
MOZ_COUNT_DTOR(nsDeque);
#ifdef DEBUG_rickg
char buffer[30];
printf("Capacity: %i\n", mCapacity);
static int mCaps[15] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
switch(mCapacity) {
case 4: mCaps[0]++; break;
case 8: mCaps[1]++; break;
case 16: mCaps[2]++; break;
case 32: mCaps[3]++; break;
case 64: mCaps[4]++; break;
case 128: mCaps[5]++; break;
case 256: mCaps[6]++; break;
case 512: mCaps[7]++; break;
case 1024: mCaps[8]++; break;
case 2048: mCaps[9]++; break;
case 4096: mCaps[10]++; break;
default:
break;
}
#endif
Erase();
if (mData && (mData!=mBuffer)) {
delete [] mData;
}
mData=0;
SetDeallocator(0);
}
/**
* Set the functor to be called by Erase()
* The deque owns the functor.
*
* @param aDeallocator functor object for use by Erase()
*/
void nsDeque::SetDeallocator(nsDequeFunctor* aDeallocator){
if (mDeallocator) {
delete mDeallocator;
}
mDeallocator=aDeallocator;
}
/**
* Remove all items from container without destroying them.
*
* @return *this
*/
nsDeque& nsDeque::Empty() {
if (mSize && mData) {
memset(mData, 0, mCapacity*sizeof(mData));
}
mSize=0;
mOrigin=0;
return *this;
}
/**
* Remove and delete all items from container
*
* @return *this
*/
nsDeque& nsDeque::Erase() {
if (mDeallocator && mSize) {
ForEach(*mDeallocator);
}
return Empty();
}
/**
* This method quadruples the size of the deque
* Elements in the deque are resequenced so that elements
* in the deque are stored sequentially
*
* If the deque actually overflows, there's very little we can do.
* Perhaps this function should return PRBool/nsresult indicating success/failure.
*
* @return capacity of the deque
* If the deque did not grow,
* and you knew its capacity beforehand,
* then this would be a way to indicate the failure.
*/
PRInt32 nsDeque::GrowCapacity() {
PRInt32 theNewSize=mCapacity<<2;
NS_ASSERTION(theNewSize>mCapacity, "Overflow");
if (theNewSize<=mCapacity)
return mCapacity;
void** temp=new void*[theNewSize];
//Here's the interesting part: You can't just move the elements
//directly (in situ) from the old buffer to the new one.
//Since capacity has changed, the old origin doesn't make
//sense anymore. It's better to resequence the elements now.
if (temp) {
PRInt32 tempi=0;
PRInt32 i=0;
PRInt32 j=0;
for (i=mOrigin; i<mCapacity; i++) {
temp[tempi++]=mData[i]; //copy the leading elements...
}
for (j=0;j<mOrigin;j++) {
temp[tempi++]=mData[j]; //copy the trailing elements...
}
if (mData != mBuffer) {
delete [] mData;
}
mCapacity=theNewSize;
mOrigin=0; //now realign the origin...
mData=temp;
}
return mCapacity;
}
/**
* This method adds an item to the end of the deque.
* This operation has the potential to cause the
* underlying buffer to resize.
*
* @param aItem: new item to be added to deque
* @return *this
*/
nsDeque& nsDeque::Push(void* aItem) {
if (mSize==mCapacity) {
GrowCapacity();
}
mData[modulus(mOrigin + mSize, mCapacity)]=aItem;
mSize++;
return *this;
}
/**
* This method adds an item to the front of the deque.
* This operation has the potential to cause the
* underlying buffer to resize.
*
* --Commments for GrowCapacity() case
* We've grown and shifted which means that the old
* final element in the deque is now the first element
* in the deque. This is temporary.
* We haven't inserted the new element at the front.
*
* To continue with the idea of having the front at zero
* after a grow, we move the old final item (which through
* the voodoo of mOrigin-- is now the first) to its final
* position which is conveniently the old length.
*
* Note that this case only happens when the deque is full.
* [And that pieces of this magic only work if the deque is full.]
* picture:
* [ABCDEFGH] @[mOrigin:3]:D.
* Task: PushFront("Z")
* shift mOrigin so, @[mOrigin:2]:C
* stretch and rearrange: (mOrigin:0)
* [CDEFGHAB ________ ________ ________]
* copy: (The second C is currently out of bounds)
* [CDEFGHAB C_______ ________ ________]
* later we will insert Z:
* [ZDEFGHAB C_______ ________ ________]
* and increment size: 9. (C is no longer out of bounds)
* --
* @param aItem: new item to be added to deque
* @return *this
*/
nsDeque& nsDeque::PushFront(void* aItem) {
mOrigin--;
modasgn(mOrigin,mCapacity);
if (mSize==mCapacity) {
GrowCapacity();
/* Comments explaining this are above*/
mData[mSize]=mData[mOrigin];
}
mData[mOrigin]=aItem;
mSize++;
return *this;
}
/**
* Remove and return the last item in the container.
*
* @return ptr to last item in container
*/
void* nsDeque::Pop() {
void* result=0;
if (mSize>0) {
--mSize;
PRInt32 offset=modulus(mSize + mOrigin, mCapacity);
result=mData[offset];
mData[offset]=0;
if (!mSize) {
mOrigin=0;
}
}
return result;
}
/**
* This method gets called you want to remove and return
* the first member in the container.
*
* @return last item in container
*/
void* nsDeque::PopFront() {
void* result=0;
if (mSize>0) {
NS_ASSERTION(mOrigin < mCapacity, "Error: Bad origin");
result=mData[mOrigin];
mData[mOrigin++]=0; //zero it out for debugging purposes.
mSize--;
// Cycle around if we pop off the end
// and reset origin if when we pop the last element
if (mCapacity==mOrigin || !mSize) {
mOrigin=0;
}
}
return result;
}
/**
* This method gets called you want to peek at the bottom
* member without removing it.
*
* @return last item in container
*/
void* nsDeque::Peek() {
void* result=0;
if (mSize>0) {
result = mData[modulus(mSize - 1 + mOrigin, mCapacity)];
}
return result;
}
/**
* This method gets called you want to peek at the topmost
* member without removing it.
*
* @return last item in container
*/
void* nsDeque::PeekFront() {
void* result=0;
if (mSize>0) {
result=mData[mOrigin];
}
return result;
}
/**
* Call this to retrieve the ith element from this container.
* Keep in mind that accessing the underlying elements is
* done in a relative fashion. Object 0 is not necessarily
* the first element (the first element is at mOrigin).
*
* @param aIndex : 0 relative offset of item you want
* @return void* or null
*/
void* nsDeque::ObjectAt(PRInt32 aIndex) const {
void* result=0;
if ((aIndex>=0) && (aIndex<mSize)) {
result=mData[modulus(mOrigin + aIndex, mCapacity)];
}
return result;
}
/**
* Create and return an iterator pointing to
* the beginning of the queue. Note that this
* takes the circular buffer semantics into account.
*
* @return new deque iterator, init'ed to 1st item
*/
nsDequeIterator nsDeque::Begin() const{
return nsDequeIterator(*this, 0);
}
/**
* Create and return an iterator pointing to
* the last item in the deque.
* Note that this takes the circular buffer semantics
* into account.
*
* @return new deque iterator, init'ed to the last item
*/
nsDequeIterator nsDeque::End() const{
return nsDequeIterator(*this, mSize - 1);
}
void* nsDeque::Last() const {
return End().GetCurrent();
}
/**
* Call this method when you want to iterate all the
* members of the container, passing a functor along
* to call your code.
*
* @param aFunctor object to call for each member
* @return *this
*/
void nsDeque::ForEach(nsDequeFunctor& aFunctor) const{
for (PRInt32 i=0; i<mSize; i++) {
aFunctor(ObjectAt(i));
}
}
/**
* Call this method when you want to iterate all the
* members of the container, calling the functor you
* passed with each member. This process will interrupt
* if your function returns non 0 to this method.
*
* @param aFunctor object to call for each member
* @return first nonzero result of aFunctor or 0.
*/
const void* nsDeque::FirstThat(nsDequeFunctor& aFunctor) const{
for (PRInt32 i=0; i<mSize; i++) {
void* obj=aFunctor(ObjectAt(i));
if (obj) {
return obj;
}
}
return 0;
}
/******************************************************
* Here comes the nsDequeIterator class...
******************************************************/
/**
* DequeIterator is an object that knows how to iterate (forward and backward)
* through a Deque. Normally, you don't need to do this, but there are some special
* cases where it is pretty handy, so here you go.
*
* This is a standard dequeiterator constructor
*
* @param aQueue is the deque object to be iterated
* @param aIndex is the starting position for your iteration
*/
nsDequeIterator::nsDequeIterator(const nsDeque& aQueue, int aIndex)
: mIndex(aIndex),
mDeque(aQueue)
{
}
/**
* Create a copy of a DequeIterator
*
* @param aCopy is another iterator to copy from
*/
nsDequeIterator::nsDequeIterator(const nsDequeIterator& aCopy)
: mIndex(aCopy.mIndex),
mDeque(aCopy.mDeque)
{
}
/**
* Moves iterator to first element in deque
* @return *this
*/
nsDequeIterator& nsDequeIterator::First(){
mIndex=0;
return *this;
}
/**
* Standard assignment operator for dequeiterator
*
* @param aCopy is an iterator to be copied from
* @return *this
*/
nsDequeIterator& nsDequeIterator::operator=(const nsDequeIterator& aCopy) {
NS_ASSERTION(&mDeque==&aCopy.mDeque,"you can't change the deque that an interator is iterating over, sorry.");
mIndex=aCopy.mIndex;
return *this;
}
/**
* preform ! operation against to iterators to test for equivalence
* (or lack thereof)!
*
* @param aIter is the object to be compared to
* @return TRUE if NOT equal.
*/
PRBool nsDequeIterator::operator!=(nsDequeIterator& aIter) {
return PRBool(!this->operator==(aIter));
}
/**
* Compare two iterators for increasing order.
*
* @param aIter is the other iterator to be compared to
* @return TRUE if this object points to an element before
* the element pointed to by aIter.
* FALSE if this and aIter are not iterating over the same deque.
*/
PRBool nsDequeIterator::operator<(nsDequeIterator& aIter) {
return PRBool(((mIndex<aIter.mIndex) && (&mDeque==&aIter.mDeque)));
}
/**
* Compare two iterators for equivalence.
*
* @param aIter is the other iterator to be compared to
* @return TRUE if EQUAL
*/
PRBool nsDequeIterator::operator==(nsDequeIterator& aIter) {
return PRBool(((mIndex==aIter.mIndex) && (&mDeque==&aIter.mDeque)));
}
/**
* Compare two iterators for non strict decreasing order.
*
* @param aIter is the other iterator to be compared to
* @return TRUE if this object points to the same element, or
* an element after the element pointed to by aIter.
* FALSE if this and aIter are not iterating over the same deque.
*/
PRBool nsDequeIterator::operator>=(nsDequeIterator& aIter) {
return PRBool(((mIndex>=aIter.mIndex) && (&mDeque==&aIter.mDeque)));
}
/**
* Pre-increment operator
*
* @return object at post-incremented index
*/
void* nsDequeIterator::operator++() {
NS_ASSERTION(mIndex<mDeque.mSize,
"You have reached the end of the Internet."\
"You have seen everything there is to see. Please go back. Now."
);
#ifndef TIMELESS_LIGHTWEIGHT
if (mIndex>=mDeque.mSize) return 0;
#endif
return mDeque.ObjectAt(++mIndex);
}
/**
* Post-increment operator
*
* @param param is ignored
* @return object at pre-incremented index
*/
void* nsDequeIterator::operator++(int) {
NS_ASSERTION(mIndex<=mDeque.mSize,
"You have already reached the end of the Internet."\
"You have seen everything there is to see. Please go back. Now."
);
#ifndef TIMELESS_LIGHTWEIGHT
if (mIndex>mDeque.mSize) return 0;
#endif
return mDeque.ObjectAt(mIndex++);
}
/**
* Pre-decrement operator
*
* @return object at pre-decremented index
*/
void* nsDequeIterator::operator--() {
NS_ASSERTION(mIndex>=0,
"You have reached the beginning of the Internet."\
"You have seen everything there is to see. Please go forward. Now."
);
#ifndef TIMELESS_LIGHTWEIGHT
if (mIndex<0) return 0;
#endif
return mDeque.ObjectAt(--mIndex);
}
/**
* Post-decrement operator
*
* @param param is ignored
* @return object at post-decremented index
*/
void* nsDequeIterator::operator--(int) {
NS_ASSERTION(mIndex>=0,
"You have already reached the beginning of the Internet."\
"You have seen everything there is to see. Please go forward. Now."
);
#ifndef TIMELESS_LIGHTWEIGHT
if (mIndex<0) return 0;
#endif
return mDeque.ObjectAt(mIndex--);
}
/**
* Dereference operator
* Note that the iterator floats, so you don't need to do:
* <code>++iter; aDeque.PopFront();</code>
* Unless you actually want your iterator to jump 2 spaces.
*
* Picture: [1 2I 3 4]
* PopFront()
* Picture: [2 3I 4]
* Note that I still happily points to object at the second index
*
* @return object at ith index
*/
void* nsDequeIterator::GetCurrent() {
NS_ASSERTION(mIndex<mDeque.mSize&&mIndex>=0,"Current is out of bounds");
#ifndef TIMELESS_LIGHTWEIGHT
if (mIndex>=mDeque.mSize||mIndex<0) return 0;
#endif
return mDeque.ObjectAt(mIndex);
}
/**
* Call this method when you want to iterate all the
* members of the container, passing a functor along
* to call your code.
*
* @param aFunctor object to call for each member
* @return *this
*/
void nsDequeIterator::ForEach(nsDequeFunctor& aFunctor) const{
mDeque.ForEach(aFunctor);
}
/**
* Call this method when you want to iterate all the
* members of the container, calling the functor you
* passed with each member. This process will interrupt
* if your function returns non 0 to this method.
*
* @param aFunctor object to call for each member
* @return first nonzero result of aFunctor or 0.
*/
const void* nsDequeIterator::FirstThat(nsDequeFunctor& aFunctor) const{
return mDeque.FirstThat(aFunctor);
}

400
xpcom/glue/nsDeque.h Normal file
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@ -0,0 +1,400 @@
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/**
* MODULE NOTES:
*
* The Deque is a very small, very efficient container object
* than can hold elements of type void*, offering the following features:
* Its interface supports pushing and popping of elements.
* It can iterate (via an interator class) its elements.
* When full, it can efficiently resize dynamically.
*
*
* NOTE: The only bit of trickery here is that this deque is
* built upon a ring-buffer. Like all ring buffers, the first
* element may not be at index[0]. The mOrigin member determines
* where the first child is. This point is quietly hidden from
* customers of this class.
*
*/
#ifndef _NSDEQUE
#define _NSDEQUE
#include "nscore.h"
/**
* The nsDequeFunctor class is used when you want to create
* callbacks between the deque and your generic code.
* Use these objects in a call to ForEach();
*
*/
class nsDequeFunctor{
public:
virtual void* operator()(void* anObject)=0;
};
/******************************************************
* Here comes the nsDeque class itself...
******************************************************/
/**
* The deque (double-ended queue) class is a common container type,
* whose behavior mimics a line in your favorite checkout stand.
* Classic CS describes the common behavior of a queue as FIFO.
* A deque allows insertion and removal at both ends of
* the container.
*
* The deque stores pointers to items.
*/
class nsDequeIterator;
class NS_COM nsDeque {
friend class nsDequeIterator;
public:
nsDeque(nsDequeFunctor* aDeallocator = nsnull);
~nsDeque();
/**
* Returns the number of elements currently stored in
* this deque.
*
* @return number of elements currently in the deque
*/
inline PRInt32 GetSize() const {return mSize;}
/**
* Appends new member at the end of the deque.
*
* @param item to store in deque
* @return *this
*/
nsDeque& Push(void* aItem);
/**
* Inserts new member at the front of the deque.
*
* @param item to store in deque
* @return *this
*/
nsDeque& PushFront(void* aItem);
/**
* Remove and return the last item in the container.
*
* @return the item that was the last item in container
*/
void* Pop();
/**
* Remove and return the first item in the container.
*
* @return the item that was first item in container
*/
void* PopFront();
/**
* Retrieve the bottom item without removing it.
*
* @return the first item in container
*/
void* Peek();
/**
* Return topmost item without removing it.
*
* @return the first item in container
*/
void* PeekFront();
/**
* Retrieve the i'th member from the deque without removing it.
*
* @param index of desired item
* @return i'th element in list
*/
void* ObjectAt(int aIndex) const;
/**
* Remove all items from container without destroying them.
*
* @return *this
*/
nsDeque& Empty();
/**
* Remove and delete all items from container.
* Deletes are handled by the deallocator nsDequeFunctor
* which is specified at deque construction.
*
* @return *this
*/
nsDeque& Erase();
/**
* Creates a new iterator, pointing to the first
* item in the deque.
*
* @return new dequeIterator
*/
nsDequeIterator Begin() const;
/**
* Creates a new iterator, pointing to the last
* item in the deque.
*
* @return new dequeIterator
*/
nsDequeIterator End() const;
void* Last() const;
/**
* Call this method when you want to iterate all the
* members of the container, passing a functor along
* to call your code.
*
* @param aFunctor object to call for each member
* @return *this
*/
void ForEach(nsDequeFunctor& aFunctor) const;
/**
* Call this method when you want to iterate all the
* members of the container, calling the functor you
* passed with each member. This process will interrupt
* if your function returns non 0 to this method.
*
* @param aFunctor object to call for each member
* @return first nonzero result of aFunctor or 0.
*/
const void* FirstThat(nsDequeFunctor& aFunctor) const;
void SetDeallocator(nsDequeFunctor* aDeallocator);
protected:
PRInt32 mSize;
PRInt32 mCapacity;
PRInt32 mOrigin;
nsDequeFunctor* mDeallocator;
void* mBuffer[8];
void** mData;
private:
/**
* Copy constructor (PRIVATE)
*
* @param another deque
*/
nsDeque(const nsDeque& other);
/**
* Deque assignment operator (PRIVATE)
*
* @param another deque
* @return *this
*/
nsDeque& operator=(const nsDeque& anOther);
PRInt32 GrowCapacity();
};
/******************************************************
* Here comes the nsDequeIterator class...
******************************************************/
class NS_COM nsDequeIterator {
public:
/**
* DequeIterator is an object that knows how to iterate
* (forward and backward) through a Deque. Normally,
* you don't need to do this, but there are some special
* cases where it is pretty handy.
*
* One warning: the iterator is not bound to an item,
* it is bound to an index, so if you insert or remove
* from the beginning while using an iterator
* (which is not recommended) then the iterator will
* point to a different item. @see GetCurrent()
*
* Here you go.
*
* @param aQueue is the deque object to be iterated
* @param aIndex is the starting position for your iteration
*/
nsDequeIterator(const nsDeque& aQueue, int aIndex=0);
/**
* Create a copy of a DequeIterator
*
* @param aCopy is another iterator to copy from
*/
nsDequeIterator(const nsDequeIterator& aCopy);
/**
* Moves iterator to first element in the deque
* @return *this
*/
nsDequeIterator& First();
/**
* Standard assignment operator for dequeiterator
* @param aCopy is another iterator to copy from
* @return *this
*/
nsDequeIterator& operator=(const nsDequeIterator& aCopy);
/**
* preform ! operation against two iterators to test for equivalence
* (or lack thereof)!
*
* @param aIter is the object to be compared to
* @return TRUE if NOT equal.
*/
PRBool operator!=(nsDequeIterator& aIter);
/**
* Compare two iterators for increasing order.
*
* @param aIter is the other iterator to be compared to
* @return TRUE if this object points to an element before
* the element pointed to by aIter.
* FALSE if this and aIter are not iterating over
* the same deque.
*/
PRBool operator<(nsDequeIterator& aIter);
/**
* Compare two iterators for equivalence.
*
* @param aIter is the other iterator to be compared to
* @return TRUE if EQUAL
*/
PRBool operator==(nsDequeIterator& aIter);
/**
* Compare two iterators for non strict decreasing order.
*
* @param aIter is the other iterator to be compared to
* @return TRUE if this object points to the same element, or
* an element after the element pointed to by aIter.
* FALSE if this and aIter are not iterating over
* the same deque.
*/
PRBool operator>=(nsDequeIterator& aIter);
/**
* Pre-increment operator
* Iterator will advance one index towards the end.
*
* @return object_at(++index)
*/
void* operator++();
/**
* Post-increment operator
* Iterator will advance one index towards the end.
*
* @param param is ignored
* @return object_at(mIndex++)
*/
void* operator++(int);
/**
* Pre-decrement operator
* Iterator will advance one index towards the beginning.
*
* @return object_at(--index)
*/
void* operator--();
/**
* Post-decrement operator
* Iterator will advance one index towards the beginning.
*
* @param param is ignored
* @return object_at(index--)
*/
void* operator--(int);
/**
* Retrieve the the iterator's notion of current node.
*
* Note that the iterator floats, so you don't need to do:
* <code>++iter; aDeque.PopFront();</code>
* Unless you actually want your iterator to jump 2 positions
* relative to its origin.
*
* Picture: [1 2i 3 4]
* PopFront()
* Picture: [2 3i 4]
* Note that I still happily points to object at the second index.
*
* @return object at i'th index
*/
void* GetCurrent();
/**
* Call this method when you want to iterate all the
* members of the container, passing a functor along
* to call your code.
*
* @param aFunctor object to call for each member
* @return *this
*/
void ForEach(nsDequeFunctor& aFunctor) const;
/**
* Call this method when you want to iterate all the
* members of the container, calling the functor you
* passed with each member. This process will interrupt
* if your function returns non 0 to this method.
*
* @param aFunctor object to call for each member
* @return first nonzero result of aFunctor or 0.
*/
const void* FirstThat(nsDequeFunctor& aFunctor) const;
protected:
PRInt32 mIndex;
const nsDeque& mDeque;
};
#endif

1
xpcom/glue/objs.mk
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@ -64,6 +64,7 @@ XPCOM_GLUE_SRC_LCPPSRCS = \
nsThreadUtils.cpp \
nsTObserverArray.cpp \
nsCycleCollectionParticipant.cpp \
nsDeque.cpp \
$(NULL)
XPCOM_GLUE_SRC_CPPSRCS = $(addprefix $(topsrcdir)/xpcom/glue/, $(XPCOM_GLUE_SRC_LCPPSRCS))