0024831: Make iterators of NCollection classes STL-compatible

STL-compatible iterators returned methods begin() and end() are provided in collection classes from NCollection package.
NCollection_Array1::Iterator is redesigned to use pointer instead of index.
Iterators of Sequence, Array, and Vector are extended by new methods to iterate backwards.

Use of SortTools_QuickSortOfReal is replaced by std::sort() in a few places (where possible).

src/GeomFill/GeomFill_Frenet.cxx

@@ -22,9 +22,9 @@
 #include <GeomFill_SnglrFunc.hxx>
 #include <Extrema_ExtPC.hxx>
 #include <TColStd_HArray1OfBoolean.hxx>
-#include <SortTools_QuickSortOfReal.hxx>
-#include <TCollection_CompareOfReal.hxx>
 #include <TColgp_SequenceOfPnt2d.hxx>
+#include <NCollection_Array1.hxx>
+#include <algorithm>
 
 static const Standard_Real NullTol = 1.e-10;
 static const Standard_Real MaxSingular = 1.e-5;
@@ -211,11 +211,10 @@ Handle(GeomFill_TrihedronLaw) GeomFill_Frenet::Copy() const
 	  }
 	// sorting
 	if(SeqArray[i-1].Length() != 0) {
-	  TColStd_Array1OfReal anArray( 1, SeqArray[i-1].Length() );
+	  NCollection_Array1<Standard_Real> anArray( 1, SeqArray[i-1].Length() );
 	  for (j = 1; j <= anArray.Length(); j++)
 	    anArray(j) = SeqArray[i-1](j);
-	  TCollection_CompareOfReal Compar;
+	  std::sort (anArray.begin(), anArray.end());
-	  SortTools_QuickSortOfReal::Sort( anArray, Compar);
 	  for (j = 1; j <= anArray.Length(); j++)
 	    SeqArray[i-1](j) = anArray(j);
 	}
@@ -258,11 +257,10 @@ Handle(GeomFill_TrihedronLaw) GeomFill_Frenet::Copy() const
 
   if(SnglSeq.Length() > 0) {
     // sorting
-    TColStd_Array1OfReal anArray( 1, SnglSeq.Length() );
+    NCollection_Array1<Standard_Real> anArray( 1, SnglSeq.Length() );
     for (i = 1; i <= SnglSeq.Length(); i++)
       anArray(i) = SnglSeq(i);
-    TCollection_CompareOfReal Compar;
+    std::sort (anArray.begin(), anArray.end());
-    SortTools_QuickSortOfReal::Sort( anArray, Compar );
     for (i = 1; i <= SnglSeq.Length(); i++)
       SnglSeq(i) = anArray(i);
     

src/NCollection/FILES

@@ -86,3 +86,5 @@ NCollection_Vec2.hxx
 NCollection_Vec3.hxx
 NCollection_Vec4.hxx
 NCollection_Mat4.hxx
+
+NCollection_StlIterator.hxx

src/NCollection/NCollection_Array1.hxx

@@ -23,6 +23,7 @@
 #endif
 
 #include <NCollection_BaseCollection.hxx>
+#include <NCollection_StlIterator.hxx>
 
 // *********************************************** Template for Array1 class
 
@@ -57,43 +58,101 @@
 template <class TheItemType> class NCollection_Array1
   : public NCollection_BaseCollection<TheItemType>
 {
+public:
+  //! STL-compliant typedef for value type
+  typedef TheItemType value_type;
 
 public:
   //! Implementation of the Iterator interface.
   class Iterator : public NCollection_BaseCollection<TheItemType>::Iterator
   {
   public:
+
     //! Empty constructor - for later Init
     Iterator (void) :
-      myCurrent (0),
+      myPtrCur (NULL),
-      myArray   (NULL) {}
+      myPtrEnd (NULL)
-    //! Constructor with initialisation
+    {
-    Iterator  (const NCollection_Array1& theArray) :
+      //
-      myCurrent (theArray.Lower()),
+    }
-      myArray   ((NCollection_Array1 *) &theArray) {}
+
+    //! Constructor with initialization
+    Iterator (const NCollection_Array1& theArray, Standard_Boolean theToEnd = Standard_False) :
+      myPtrEnd (const_cast<TheItemType*> (&theArray.Last() + 1))
+    {
+      myPtrCur = theToEnd ? myPtrEnd : const_cast<TheItemType*> (&theArray.First());
+    }
+
     //! Initialisation
     void Init (const NCollection_Array1& theArray)
     { 
-      myCurrent = theArray.Lower();
+      myPtrCur = const_cast<TheItemType*> (&theArray.First());
-      myArray   = (NCollection_Array1 *) &theArray; 
+      myPtrEnd = const_cast<TheItemType*> (&theArray.Last() + 1);
     }
+
+    //! Assignment
+    Iterator& operator= (const Iterator& theOther)
+    {
+      myPtrCur = theOther.myPtrCur;
+      myPtrEnd = theOther.myPtrEnd;
+      return *this;
+    }
+
     //! Check end
     virtual Standard_Boolean More (void) const
-    { return (myCurrent<=myArray->Upper()); }
+    { return myPtrCur < myPtrEnd; }
-    //! Make step
+    
+    //! Increment operator
     virtual void Next (void)
-    { myCurrent++; }
+    { ++myPtrCur; }
+
+    //! Decrement operator
+    virtual void Previous()
+    { --myPtrCur; }
+
+    //! Offset operator.
+    virtual void Offset (ptrdiff_t theOffset)
+    { myPtrCur += theOffset; }
+
+    //! Difference operator.
+    virtual ptrdiff_t Differ (const Iterator& theOther) const
+    { return myPtrCur - theOther.myPtrCur; }
+
     //! Constant value access
     virtual const TheItemType& Value (void) const
-    { return myArray->Value(myCurrent); }
+    { return *myPtrCur; }
+
     //! Variable value access
     virtual TheItemType& ChangeValue (void) const 
-    { return myArray->ChangeValue(myCurrent); }
+    { return *myPtrCur; }
+
+    //! Performs comparison of two iterators
+    virtual Standard_Boolean IsEqual (const Iterator& theOther) const
+    { return myPtrCur == theOther.myPtrCur; }
+
   private:
-    Standard_Integer    myCurrent; //!< Index of the current item
+    TheItemType* myPtrCur; //!< Pointer to the current element in the array
-    NCollection_Array1* myArray;   //!< Pointer to the array being iterated
+    TheItemType* myPtrEnd; //!< Pointer to the past-the-end element in the array
   }; // End of the nested class Iterator
 
+  //! Shorthand for a regular iterator type.
+  typedef NCollection_StlIterator<std::random_access_iterator_tag, Iterator, TheItemType, false> iterator;
+
+  //! Shorthand for a constant iterator type.
+  typedef NCollection_StlIterator<std::random_access_iterator_tag, Iterator, TheItemType, true> const_iterator;
+
+  //! Returns an iterator pointing to the first element in the array.
+  iterator begin() const { return Iterator (*this, false); }
+
+  //! Returns an iterator referring to the past-the-end element in the array.
+  iterator end() const { return Iterator (*this, true); }
+  
+  //! Returns a const iterator pointing to the first element in the array.
+  const_iterator cbegin() const { return Iterator (*this, false); }
+
+  //! Returns a const iterator referring to the past-the-end element in the array.
+  const_iterator cend() const { return Iterator (*this, true); }
+
  public:
   // ---------- PUBLIC METHODS ------------
 

src/NCollection/NCollection_Array2.hxx

@@ -40,6 +40,10 @@
 template <class TheItemType> class NCollection_Array2
   : public NCollection_BaseCollection<TheItemType>
 {
+public:
+  //! STL-compliant typedef for value type
+  typedef TheItemType value_type;
+
 public:
   // **************** Implementation of the Iterator interface.
   class Iterator : public NCollection_BaseCollection<TheItemType>::Iterator

src/NCollection/NCollection_BaseList.hxx

@@ -72,11 +72,16 @@ class NCollection_BaseList
     }
 //skt----------------------------------------------------
     // ******** Comparison operator
-    Standard_Boolean operator== (const Iterator& theIt)
+    Standard_Boolean operator== (const Iterator& theIt) const
     {
       return myCurrent == theIt.myCurrent;
     }
 //-------------------------------------------------------
+    //! Performs comparison of two iterators
+    virtual Standard_Boolean IsEqual (const Iterator& theOther) const
+    {
+      return *this == theOther;
+    }
   protected:
     void Init (const NCollection_BaseList& theList,
                NCollection_ListNode * const thePrev)

src/NCollection/NCollection_BaseMap.hxx

@@ -91,6 +91,12 @@ class NCollection_BaseMap
       PNext();
     }
     
+    //! Performs comparison of two iterators.
+    virtual Standard_Boolean IsEqual (const Iterator& theOther) const
+    {
+      return myBucket == theOther.myBucket && myNode == theOther.myNode;
+    }
+
   protected:
     //! PMore
     Standard_Boolean PMore (void) const

src/NCollection/NCollection_BaseSequence.cxx

@@ -28,10 +28,9 @@
 void NCollection_BaseSequence::ClearSeq 
   (NCollection_DelSeqNode fDel, Handle(NCollection_BaseAllocator)& theAl)
 {
-  const NCollection_SeqNode * p = myFirstItem;
+  NCollection_SeqNode* p = myFirstItem;
-  NCollection_SeqNode * q;
   while (p) {
-    q = (NCollection_SeqNode *) p;
+    NCollection_SeqNode* q = p;
     p = p->Next();
     fDel (q, theAl);
   }
@@ -49,7 +48,7 @@ void NCollection_BaseSequence::PAppend (NCollection_SeqNode * theItem)
     myFirstItem = myLastItem = myCurrentItem = theItem;
     myCurrentIndex = mySize = 1;
   } else {
-    ((NCollection_SeqNode *) myLastItem)->SetNext(theItem);
+    myLastItem->SetNext(theItem);
     theItem->SetPrevious(myLastItem);
     theItem->SetNext(NULL);
     myLastItem = theItem;
@@ -72,9 +71,9 @@ void NCollection_BaseSequence::PAppend(NCollection_BaseSequence& Other)
     myCurrentIndex = 1;
   } else {
     mySize += Other.mySize;
-    ((NCollection_SeqNode *) myLastItem)->SetNext(Other.myFirstItem);
+    myLastItem->SetNext(Other.myFirstItem);
     if (Other.myFirstItem) {
-      ((NCollection_SeqNode *) Other.myFirstItem)->SetPrevious(myLastItem);
+      Other.myFirstItem->SetPrevious(myLastItem);
       myLastItem = Other.myLastItem;
     }
   }
@@ -92,8 +91,8 @@ void NCollection_BaseSequence::PPrepend (NCollection_SeqNode * theItem)
     myFirstItem = myLastItem = myCurrentItem = theItem;
     myCurrentIndex = mySize = 1;
   } else {
-    ((NCollection_SeqNode *) myFirstItem)->SetPrevious (theItem);
+    myFirstItem->SetPrevious (theItem);
-    ((NCollection_SeqNode *) theItem)->SetNext (myFirstItem); 
+    theItem->SetNext (myFirstItem); 
     theItem->SetPrevious(NULL);
     theItem->SetNext(myFirstItem);
     myFirstItem = theItem;
@@ -118,8 +117,8 @@ void NCollection_BaseSequence::PPrepend (NCollection_BaseSequence& Other)
   } else {
     mySize += Other.mySize;
     if (Other.myLastItem)
-      ((NCollection_SeqNode *) Other.myLastItem)->SetNext (myFirstItem);
+      Other.myLastItem->SetNext (myFirstItem);
-    ((NCollection_SeqNode *) myFirstItem)->SetPrevious(Other.myLastItem);
+    myFirstItem->SetPrevious(Other.myLastItem);
     myFirstItem = Other.myFirstItem;
     myCurrentIndex += Other.mySize;
   }
@@ -133,18 +132,18 @@ void NCollection_BaseSequence::PPrepend (NCollection_BaseSequence& Other)
 
 void NCollection_BaseSequence::PReverse()
 {
-  const NCollection_SeqNode * p = myFirstItem;
+  NCollection_SeqNode* p = myFirstItem;
-  const NCollection_SeqNode * tmp;
   while (p) {
-    tmp = p->Next();
+    NCollection_SeqNode* tmp = p->Next();
-    ((NCollection_SeqNode *) p)->SetNext (p->Previous());
+    p->SetNext (p->Previous());
-    ((NCollection_SeqNode *) p)->SetPrevious (tmp);
+    p->SetPrevious (tmp);
     p = tmp;
   }
-  tmp = myFirstItem;
+  NCollection_SeqNode* tmp = myFirstItem;
   myFirstItem = myLastItem;
   myLastItem = tmp;
-  if (mySize != 0) myCurrentIndex = mySize + 1 - myCurrentIndex;
+  if (mySize != 0)
+    myCurrentIndex = mySize + 1 - myCurrentIndex;
 }
 
 
@@ -163,8 +162,10 @@ void NCollection_BaseSequence::PInsertAfter
   else {
     theItem->SetNext (aPos->Next());
     theItem->SetPrevious (aPos);
-    if (aPos->Next() == NULL) myLastItem = theItem;
+    if (aPos->Next() == NULL)
-    else ((NCollection_SeqNode *) aPos->Next())->SetPrevious(theItem);
+      myLastItem = theItem;
+    else
+      aPos->Next()->SetPrevious(theItem);
     aPos->SetNext(theItem);
     ++ mySize;
     myCurrentItem = myFirstItem;
@@ -183,12 +184,14 @@ void NCollection_BaseSequence::PInsertAfter(const Standard_Integer theIndex,
   if (theIndex == 0)
     PPrepend (theItem);
   else {
-    const NCollection_SeqNode * p = Find (theIndex);
+    NCollection_SeqNode * p = Find (theIndex);
     theItem->SetNext(p->Next());
     theItem->SetPrevious(p);
-    if (theIndex == mySize) myLastItem = theItem;
+    if (theIndex == mySize)
-    else ((NCollection_SeqNode *) p->Next())->SetPrevious(theItem);
+      myLastItem = theItem;
-    ((NCollection_SeqNode *) p)->SetNext(theItem);
+    else
+      p->Next()->SetPrevious(theItem);
+    p->SetNext(theItem);
     ++ mySize;
     if (theIndex < myCurrentIndex)
       ++ myCurrentIndex;
@@ -209,14 +212,14 @@ void NCollection_BaseSequence::PInsertAfter (const Standard_Integer theIndex,
     if (theIndex == 0) 
       PPrepend (Other);
     else {
-      const NCollection_SeqNode * p = Find (theIndex);
+      NCollection_SeqNode * p = Find (theIndex);
-      ((NCollection_SeqNode *) Other.myFirstItem)->SetPrevious (p);
+      Other.myFirstItem->SetPrevious (p);
-      ((NCollection_SeqNode *) Other.myLastItem)->SetNext (p->Next());
+      Other.myLastItem->SetNext (p->Next());
       if (theIndex == mySize)
         myLastItem = Other.myLastItem;
       else
-        ((NCollection_SeqNode *) p->Next())->SetPrevious (Other.myLastItem);
+        p->Next()->SetPrevious (Other.myLastItem);
-      ((NCollection_SeqNode *) p)->SetNext (Other.myFirstItem);
+      p->SetNext (Other.myFirstItem);
       mySize += Other.mySize;
       if (theIndex < myCurrentIndex)
         myCurrentIndex += Other.mySize;
@@ -240,39 +243,39 @@ void NCollection_BaseSequence::PExchange (const Standard_Integer I,
   if (J < I)
     PExchange(J,I);
   else if (I < J) {
-    const NCollection_SeqNode * pi = Find(I);
+    NCollection_SeqNode * pi = Find(I);
-    const NCollection_SeqNode * pj = Find(J);
+    NCollection_SeqNode * pj = Find(J);
 
     // update the node before I
     if (pi->Previous())
-      ((NCollection_SeqNode *) pi->Previous())->SetNext (pj);
+      pi->Previous()->SetNext (pj);
     else 
       myFirstItem = pj;
 
     // update the node after J
     if (pj->Next())
-      ((NCollection_SeqNode *) pj->Next())->SetPrevious(pi);
+      pj->Next()->SetPrevious(pi);
     else
       myLastItem = pi;
 
     if (pi->Next() == pj) {          // I and J are consecutives, update them
-      ((NCollection_SeqNode *) pj)->SetPrevious (pi->Previous());
+      pj->SetPrevious (pi->Previous());
-      ((NCollection_SeqNode *) pi)->SetPrevious (pj);
+      pi->SetPrevious (pj);
-      ((NCollection_SeqNode *) pi)->SetNext (pj->Next());
+      pi->SetNext (pj->Next());
-      ((NCollection_SeqNode *) pj)->SetNext (pi);
+      pj->SetNext (pi);
     }
     else {                        // I and J are not consecutive
       // update the node after I
-      ((NCollection_SeqNode *) pi->Next())->SetPrevious (pj);
+      pi->Next()->SetPrevious (pj);
       // update the node before J
-      ((NCollection_SeqNode *) pj->Previous())->SetNext (pi);
+      pj->Previous()->SetNext (pi);
       // update nodes I and J
-      const NCollection_SeqNode* tmp = pi->Next();       
+      NCollection_SeqNode* tmp = pi->Next();       
-      ((NCollection_SeqNode *) pi)->SetNext (pj->Next());
+      pi->SetNext (pj->Next());
-      ((NCollection_SeqNode *) pj)->SetNext (tmp);
+      pj->SetNext (tmp);
       tmp = pi->Previous();
-      ((NCollection_SeqNode *) pi)->SetPrevious (pj->Previous());
+      pi->SetPrevious (pj->Previous());
-      ((NCollection_SeqNode *) pj)->SetPrevious (tmp);
+      pj->SetPrevious (tmp);
     }
 
     if      (myCurrentIndex == I) myCurrentItem = pj;
@@ -291,14 +294,14 @@ void NCollection_BaseSequence::PSplit (const Standard_Integer theIndex,
   Standard_OutOfRange_Raise_if (theIndex <= 0 || theIndex > mySize,"" );
   Standard_DomainError_Raise_if (this == &Sub, "No Split on myself!!");
 
-  const NCollection_SeqNode * p = Find (theIndex);
+  NCollection_SeqNode * p = Find (theIndex);
 
   Sub.myLastItem = myLastItem;
   Sub.mySize = mySize - theIndex + 1;
 
   myLastItem = p->Previous();
   if (myLastItem) {
-    ((NCollection_SeqNode *) myLastItem)->SetNext(NULL);
+    myLastItem->SetNext(NULL);
     mySize = theIndex - 1;
     if (myCurrentIndex >= theIndex) {
       myCurrentIndex = 1;
@@ -310,7 +313,7 @@ void NCollection_BaseSequence::PSplit (const Standard_Integer theIndex,
   }
 
   Sub.myFirstItem = Sub.myCurrentItem = p;
-  ((NCollection_SeqNode *) p)->SetPrevious (NULL);
+  p->SetPrevious (NULL);
   Sub.myCurrentIndex = 1;
 }
 
@@ -327,15 +330,15 @@ void NCollection_BaseSequence::RemoveSeq
   NCollection_SeqNode * aPos = thePosition.myCurrent;
   if (aPos == NULL)
     return;
-  thePosition.myCurrent = (NCollection_SeqNode *) aPos -> Next();
+  thePosition.myCurrent = aPos -> Next();
 
   if (aPos->Previous())
-    ((NCollection_SeqNode *) aPos->Previous())->SetNext (aPos->Next());
+    aPos->Previous()->SetNext (aPos->Next());
   else
     myFirstItem = aPos->Next();
 
   if (aPos->Next())
-    ((NCollection_SeqNode *) aPos->Next())->SetPrevious (aPos->Previous());
+    aPos->Next()->SetPrevious (aPos->Previous());
   else
     myLastItem = aPos->Previous();
 
@@ -358,13 +361,13 @@ void NCollection_BaseSequence::RemoveSeq
 {
   Standard_OutOfRange_Raise_if (theIndex <= 0 || theIndex > mySize, "");
   
-  const NCollection_SeqNode * p = Find (theIndex);
+  NCollection_SeqNode * p = Find (theIndex);
   if (p->Previous())
-    ((NCollection_SeqNode *) p->Previous())->SetNext (p->Next());
+    p->Previous()->SetNext (p->Next());
   else
     myFirstItem = p->Next();
   if (p->Next())
-    ((NCollection_SeqNode *) p->Next())->SetPrevious (p->Previous());
+    p->Next()->SetPrevious (p->Previous());
   else
     myLastItem = p->Previous();
 
@@ -378,7 +381,7 @@ void NCollection_BaseSequence::RemoveSeq
       myCurrentIndex = mySize;
     }
   }
-  fDel ((NCollection_SeqNode *) p, theAl);
+  fDel (p, theAl);
 }
 
 //=======================================================================
@@ -394,15 +397,15 @@ void NCollection_BaseSequence::RemoveSeq
 {
   Standard_OutOfRange_Raise_if (From <= 0 || To > mySize || From > To, "");
 
-  const NCollection_SeqNode * pfrom = Find(From);
+  NCollection_SeqNode * pfrom = Find(From);
-  const NCollection_SeqNode * pto   = Find(To);
+  NCollection_SeqNode * pto   = Find(To);
   
   if (pfrom->Previous())
-    ((NCollection_SeqNode *) pfrom->Previous())->SetNext (pto->Next());
+    pfrom->Previous()->SetNext (pto->Next());
   else
     myFirstItem = pto->Next();
   if (pto->Next())
-    ((NCollection_SeqNode *) pto->Next())->SetPrevious (pfrom->Previous());
+    pto->Next()->SetPrevious (pfrom->Previous());
   else
     myLastItem = pfrom->Previous();
   
@@ -420,7 +423,7 @@ void NCollection_BaseSequence::RemoveSeq
   }
   
   for (Standard_Integer i = From; i <= To; i++) {
-    NCollection_SeqNode * tmp = (NCollection_SeqNode *)pfrom;
+    NCollection_SeqNode * tmp = pfrom;
     pfrom = pfrom->Next();
     fDel (tmp, theAl);
   }
@@ -431,26 +434,29 @@ void NCollection_BaseSequence::RemoveSeq
 //purpose  : 
 //=======================================================================
 
-const NCollection_SeqNode * NCollection_BaseSequence::Find
+NCollection_SeqNode * NCollection_BaseSequence::Find (const Standard_Integer theIndex) const 
-                                        (const Standard_Integer theIndex) const 
 {
   Standard_Integer i;
-  const NCollection_SeqNode * p;
+  NCollection_SeqNode * p;
   if (theIndex <= myCurrentIndex) {
     if (theIndex < myCurrentIndex / 2) {
       p = myFirstItem;
-      for (i = 1; i < theIndex; i++) p = p->Next();
+      for (i = 1; i < theIndex; i++)
+        p = p->Next();
     } else {
       p = myCurrentItem;
-      for (i = myCurrentIndex; i > theIndex; i--) p = p->Previous();
+      for (i = myCurrentIndex; i > theIndex; i--)
+        p = p->Previous();
     }
   } else {
     if (theIndex < (myCurrentIndex + mySize) / 2) {
       p = myCurrentItem;
-      for (i = myCurrentIndex; i < theIndex; i++) p = p->Next();
+      for (i = myCurrentIndex; i < theIndex; i++)
+        p = p->Next();
     } else {
       p = myLastItem;
-      for (i = mySize; i > theIndex; i--) p = p->Previous();
+      for (i = mySize; i > theIndex; i--)
+        p = p->Previous();
     }
   }
   return p;

src/NCollection/NCollection_BaseSequence.hxx

@@ -24,26 +24,15 @@
 class NCollection_SeqNode 
 {
  public:
-  // Methods PUBLIC
+  NCollection_SeqNode () : myNext (NULL), myPrevious (NULL) {}
-  // 
+  NCollection_SeqNode * Next      () const { return myNext; }
-  NCollection_SeqNode (void)
+  NCollection_SeqNode * Previous  () const { return myPrevious; }
-    : myNext (NULL), myPrevious (NULL)                {}
+  void SetNext     (NCollection_SeqNode * theNext) { myNext = theNext; }
-  const NCollection_SeqNode * Next      () const      { return myNext; }
+  void SetPrevious (NCollection_SeqNode * thePrev) { myPrevious = thePrev; }
-  const NCollection_SeqNode * Previous  () const      { return myPrevious; }
-  void                      SetNext     (const NCollection_SeqNode * theNext)
-                                                      { myNext = theNext; }
-  void                      SetPrevious (const NCollection_SeqNode * thePrev)
-                                                      { myPrevious = thePrev; }
-  //~NCollection_SeqNode() {
-  //  if (myNext)           myNext -> myPrevious = myPrevious;
-  //  if (myPrevious)       myPrevious -> myNext = myNext;
-  //}
   
  private:
-  // Fields PRIVATE
+  NCollection_SeqNode* myNext;
-  //
+  NCollection_SeqNode* myPrevious;
-  const NCollection_SeqNode     * myNext;
-  const NCollection_SeqNode     * myPrevious;
 };
 
 typedef void (* NCollection_DelSeqNode) 
@@ -60,28 +49,41 @@ class NCollection_BaseSequence
   {
   public:
     //! Empty constructor
-    Iterator                    (void) : myCurrent (NULL) {}
+    Iterator (void) : myCurrent (NULL), myPrevious(NULL) {}
+
     //! Constructor with initialisation
     Iterator (const NCollection_BaseSequence& theSeq,
               const Standard_Boolean isStart)
-      : myCurrent(isStart ? (NCollection_SeqNode *)theSeq.myFirstItem
+    {
-                          : (NCollection_SeqNode *)theSeq.myLastItem) {}
+      Init (theSeq, isStart);
+    }
+
      //! Initialisation
     void Init (const NCollection_BaseSequence& theSeq,
-                                 const Standard_Boolean          isStart
+               const Standard_Boolean isStart = Standard_True)
-                                                                = Standard_True)
+    {
-    { myCurrent = isStart ? (NCollection_SeqNode *)theSeq.myFirstItem
+      myCurrent  = (isStart ? theSeq.myFirstItem : NULL);
-                          : (NCollection_SeqNode *)theSeq.myLastItem; }
+      myPrevious = (isStart ? NULL : theSeq.myLastItem);
+    }
+
     //! Assignment
     Iterator& operator = (const Iterator& theOther)
-    { myCurrent = theOther.myCurrent; return *this; }
+    {
-    //! Previous
+      myCurrent = theOther.myCurrent;
+      myPrevious = theOther.myPrevious;
+      return *this;
+    }
+    //! Switch to previous element; note that it will reset 
     void Previous()
-    { if (myCurrent)
+    {
-        myCurrent = (NCollection_SeqNode *)myCurrent -> Previous(); }
+      myCurrent = myPrevious;
+      if (myCurrent)
+        myPrevious = myCurrent->Previous();
+    }
       
   protected:
     NCollection_SeqNode* myCurrent;  //!< Pointer to the current node
+    NCollection_SeqNode* myPrevious; //!< Pointer to the previous node
     friend class NCollection_BaseSequence;
   };
 
@@ -122,15 +124,15 @@ class NCollection_BaseSequence
   Standard_EXPORT void   PReverse    ();
   Standard_EXPORT void   PExchange   (const Standard_Integer I,
                                       const Standard_Integer J) ;
-  Standard_EXPORT const NCollection_SeqNode *
+  Standard_EXPORT NCollection_SeqNode *
                          Find        (const Standard_Integer) const;
 
  protected:
   // Fields PROTECTED
   //
-  const NCollection_SeqNode         * myFirstItem;
+  NCollection_SeqNode* myFirstItem;
-  const NCollection_SeqNode         * myLastItem;
+  NCollection_SeqNode* myLastItem;
-  const NCollection_SeqNode         * myCurrentItem;
+  NCollection_SeqNode* myCurrentItem;
   Standard_Integer myCurrentIndex;
   Standard_Integer mySize;
 

src/NCollection/NCollection_BaseVector.cxx

@@ -36,20 +36,24 @@ void NCollection_BaseVector::Iterator::copyV (const NCollection_BaseVector::Iter
 //purpose  : Initialisation of iterator by a vector
 //=======================================================================
 
-void NCollection_BaseVector::Iterator::initV (const NCollection_BaseVector& theVector)
+void NCollection_BaseVector::Iterator::initV (const NCollection_BaseVector& theVector, Standard_Boolean theToEnd)
 {
   myVector = &theVector;
-  myICurBlock = 0;
+
-  myCurIndex  = 0;
   if (theVector.myNBlocks == 0)
   {
-    myIEndBlock = 0;
+    myCurIndex  = 0;
     myEndIndex  = 0;
+    myICurBlock = 0;
+    myIEndBlock = 0;
   }
   else
   {
     myIEndBlock = theVector.myNBlocks - 1;
     myEndIndex  = theVector.myData[myIEndBlock].Length;
+
+    myICurBlock = !theToEnd ? 0 : myIEndBlock;
+    myCurIndex  = !theToEnd ? 0 : myEndIndex;
   }
 }
 

src/NCollection/NCollection_BaseVector.hxx

@@ -74,9 +74,9 @@ protected:
       myCurIndex  (0),
       myEndIndex  (0) {}
 
-    Iterator (const NCollection_BaseVector& theVector)
+    Iterator (const NCollection_BaseVector& theVector, Standard_Boolean theToEnd = Standard_False)
     {
-      initV (theVector);
+      initV (theVector, theToEnd);
     }
 
     Iterator (const Iterator& theVector)
@@ -84,7 +84,7 @@ protected:
       copyV (theVector);
     }
 
-    Standard_EXPORT void initV (const NCollection_BaseVector& theVector);
+    Standard_EXPORT void initV (const NCollection_BaseVector& theVector, Standard_Boolean theToEnd = Standard_False);
 
     Standard_EXPORT void copyV (const Iterator&);
 
@@ -103,6 +103,27 @@ protected:
       }
     }
 
+    void prevV()
+    {
+      if (--myCurIndex < 0 && myICurBlock > 0)
+      {
+        --myICurBlock;
+        myCurIndex = myVector->myData[myICurBlock].Length - 1;
+      }
+    }
+
+    virtual void offsetV (Standard_Integer theOffset)
+    {
+      const Standard_Integer anIndex = myCurIndex + myICurBlock * myVector->myIncrement + theOffset;
+      myICurBlock = anIndex / myVector->myIncrement;
+      myCurIndex = anIndex % myVector->myIncrement;
+    }
+
+    virtual Standard_Integer differV (const Iterator& theOther) const
+    {
+      return (myCurIndex - theOther.myCurIndex) + (myICurBlock - theOther.myICurBlock) * myVector->myIncrement;
+    }
+
     const MemBlock* curBlockV() const
     {
       return &myVector->myData[myICurBlock];

src/NCollection/NCollection_DataMap.hxx

@@ -19,7 +19,7 @@
 #include <NCollection_BaseCollection.hxx>
 #include <NCollection_BaseMap.hxx>
 #include <NCollection_TListNode.hxx>
-
+#include <NCollection_StlIterator.hxx>
 #include <NCollection_DefaultHasher.hxx>
 
 #include <Standard_TypeMismatch.hxx>
@@ -125,6 +125,24 @@ template < class TheKeyType,
     }
   };
   
+  //! Shorthand for a regular iterator type.
+  typedef NCollection_StlIterator<std::forward_iterator_tag, Iterator, TheItemType, false> iterator;
+
+  //! Shorthand for a constant iterator type.
+  typedef NCollection_StlIterator<std::forward_iterator_tag, Iterator, TheItemType, true> const_iterator;
+
+  //! Returns an iterator pointing to the first element in the map.
+  iterator begin() const { return Iterator (*this); }
+
+  //! Returns an iterator referring to the past-the-end element in the map.
+  iterator end() const { return Iterator(); }
+
+  //! Returns a const iterator pointing to the first element in the map.
+  const_iterator cbegin() const { return Iterator (*this); }
+
+  //! Returns a const iterator referring to the past-the-end element in the map.
+  const_iterator cend() const { return Iterator(); }
+
  public:
   // ---------- PUBLIC METHODS ------------
 

src/NCollection/NCollection_IndexedDataMap.hxx

@@ -21,7 +21,7 @@
 #include <NCollection_TListNode.hxx>
 #include <Standard_TypeMismatch.hxx>
 #include <Standard_NoSuchObject.hxx>
-
+#include <NCollection_StlIterator.hxx>
 #include <NCollection_DefaultHasher.hxx>
 
 #if !defined No_Exception && !defined No_Standard_OutOfRange
@@ -110,7 +110,7 @@ template < class TheKeyType,
       myIndex (1) {}
     //! Query if the end of collection is reached by iterator
     virtual Standard_Boolean More(void) const
-    { return (myIndex <= myMap->Extent()); }
+    { return (myMap != NULL) && (myIndex <= myMap->Extent()); }
     //! Make a step along the collection
     virtual void Next(void)
     {
@@ -143,12 +143,37 @@ template < class TheKeyType,
 #endif
       return myNode->Key1();
     }
+    //! Performs comparison of two iterators.
+    virtual Standard_Boolean IsEqual (const Iterator& theOther) const
+    {
+      return myMap == theOther.myMap &&
+             myNode == theOther.myNode &&
+             myIndex == theOther.myIndex;
+    }
   private:
     NCollection_IndexedDataMap* myMap;   //!< Pointer to the map being iterated
     IndexedDataMapNode*         myNode;  //!< Current node
     Standard_Integer            myIndex; //!< Current index
   };
   
+  //! Shorthand for a regular iterator type.
+  typedef NCollection_StlIterator<std::forward_iterator_tag, Iterator, TheItemType, false> iterator;
+
+  //! Shorthand for a constant iterator type.
+  typedef NCollection_StlIterator<std::forward_iterator_tag, Iterator, TheItemType, true> const_iterator;
+
+  //! Returns an iterator pointing to the first element in the map.
+  iterator begin() const { return Iterator (*this); }
+
+  //! Returns an iterator referring to the past-the-end element in the map.
+  iterator end() const { return Iterator(); }
+
+  //! Returns a const iterator pointing to the first element in the map.
+  const_iterator cbegin() const { return Iterator (*this); }
+
+  //! Returns a const iterator referring to the past-the-end element in the map.
+  const_iterator cend() const { return Iterator(); }
+  
  public:
   // ---------- PUBLIC METHODS ------------
 

src/NCollection/NCollection_IndexedMap.hxx

@@ -19,6 +19,7 @@
 #include <NCollection_BaseCollection.hxx>
 #include <NCollection_BaseMap.hxx>
 #include <NCollection_TListNode.hxx>
+#include <NCollection_StlIterator.hxx>
 #include <Standard_NoSuchObject.hxx>
 #include <Standard_ImmutableObject.hxx>
 
@@ -99,7 +100,7 @@ template < class TheKeyType,
       myIndex(1) {}
     //! Query if the end of collection is reached by iterator
     virtual Standard_Boolean More(void) const
-    { return (myIndex <= myMap->Extent()); }
+    { return (myMap != NULL) && (myIndex <= myMap->Extent()); }
     //! Make a step along the collection
     virtual void Next(void)
     { myIndex++; }
@@ -118,12 +119,26 @@ template < class TheKeyType,
       Standard_ImmutableObject::Raise ("impossible to ChangeValue");
       return * (TheKeyType *) NULL; // This for compiler
     }
+    //! Performs comparison of two iterators.
+    virtual Standard_Boolean IsEqual (const Iterator& theOther) const
+    {
+      return myMap == theOther.myMap && myIndex == theOther.myIndex;
+    }
     
   private:
     NCollection_IndexedMap * myMap;   // Pointer to the map being iterated
     Standard_Integer         myIndex; // Current index
   };
   
+  //! Shorthand for a constant iterator type.
+  typedef NCollection_StlIterator<std::forward_iterator_tag, Iterator, TheKeyType, true> const_iterator;
+
+  //! Returns a const iterator pointing to the first element in the map.
+  const_iterator cbegin() const { return Iterator (*this); }
+
+  //! Returns a const iterator referring to the past-the-end element in the map.
+  const_iterator cend() const { return Iterator(); }
+  
  public:
   // ---------- PUBLIC METHODS ------------
 

src/NCollection/NCollection_List.hxx

@@ -17,6 +17,7 @@
 #define NCollection_List_HeaderFile
 
 #include <NCollection_TListIterator.hxx>
+#include <NCollection_StlIterator.hxx>
 
 #if !defined No_Exception && !defined No_Standard_NoSuchObject
 #include <Standard_NoSuchObject.hxx>
@@ -31,10 +32,32 @@ template <class TheItemType> class NCollection_List
   : public NCollection_BaseCollection<TheItemType>,
     public NCollection_BaseList
 {
+public:
+  //! STL-compliant typedef for value type
+  typedef TheItemType value_type;
+
 public:
   typedef NCollection_TListNode<TheItemType>     ListNode;
   typedef NCollection_TListIterator<TheItemType> Iterator;
 
+  //! Shorthand for a regular iterator type.
+  typedef NCollection_StlIterator<std::forward_iterator_tag, Iterator, TheItemType, false> iterator;
+
+  //! Shorthand for a constant iterator type.
+  typedef NCollection_StlIterator<std::forward_iterator_tag, Iterator, TheItemType, true> const_iterator;
+
+  //! Returns an iterator pointing to the first element in the list.
+  iterator begin() const { return Iterator (*this); }
+
+  //! Returns an iterator referring to the past-the-end element in the list.
+  iterator end() const { return Iterator(); }
+
+  //! Returns a const iterator pointing to the first element in the list.
+  const_iterator cbegin() const { return Iterator (*this); }
+
+  //! Returns a const iterator referring to the past-the-end element in the list.
+  const_iterator cend() const { return Iterator(); }
+
  public:
   // ---------- PUBLIC METHODS ------------
 

src/NCollection/NCollection_Map.hxx

@@ -20,7 +20,7 @@
 #include <NCollection_BaseMap.hxx>
 #include <NCollection_DataMap.hxx>
 #include <NCollection_TListNode.hxx>
-
+#include <NCollection_StlIterator.hxx>
 #include <NCollection_DefaultHasher.hxx>
 
 #include <Standard_ImmutableObject.hxx>
@@ -123,6 +123,15 @@ template < class TheKeyType,
     }
   };
   
+  //! Shorthand for a constant iterator type.
+  typedef NCollection_StlIterator<std::forward_iterator_tag, Iterator, TheKeyType, true> const_iterator;
+
+  //! Returns a const iterator pointing to the first element in the map.
+  const_iterator cbegin() const { return Iterator (*this); }
+
+  //! Returns a const iterator referring to the past-the-end element in the map.
+  const_iterator cend() const { return Iterator(); }
+
  public:
   // ---------- PUBLIC METHODS ------------
 

src/NCollection/NCollection_Sequence.hxx

@@ -18,6 +18,7 @@
 
 #include <NCollection_BaseCollection.hxx>
 #include <NCollection_BaseSequence.hxx>
+#include <NCollection_StlIterator.hxx>
 
 #ifndef No_Exception
 #include <Standard_OutOfRange.hxx>
@@ -32,6 +33,9 @@ template <class TheItemType> class NCollection_Sequence
   : public NCollection_BaseCollection<TheItemType>,
     public NCollection_BaseSequence
 {
+public:
+  //! STL-compliant typedef for value type
+  typedef TheItemType value_type;
 
 public:
   //!   Class defining sequence node - for internal use by Sequence
@@ -78,15 +82,44 @@ template <class TheItemType> class NCollection_Sequence
     { return (myCurrent!=NULL); }
     //! Make step
     virtual void Next (void)
-    { if (myCurrent) myCurrent = (NCollection_SeqNode *) myCurrent->Next(); }
+    {
+      if (myCurrent)
+      {
+        myPrevious = myCurrent;
+        myCurrent = myCurrent->Next();
+      }
+    }
     //! Constant value access
     virtual const TheItemType& Value (void) const
     { return ((const Node *)myCurrent)->Value(); }
     //! Variable value access
     virtual TheItemType& ChangeValue (void) const
     { return ((Node *)myCurrent)->ChangeValue(); }
+    //! Performs comparison of two iterators.
+    virtual Standard_Boolean IsEqual (const Iterator& theOther) const
+    {
+      return myCurrent == theOther.myCurrent;
+    }
   }; // End of nested class Iterator
 
+  //! Shorthand for a regular iterator type.
+  typedef NCollection_StlIterator<std::bidirectional_iterator_tag, Iterator, TheItemType, false> iterator;
+
+  //! Shorthand for a constant iterator type.
+  typedef NCollection_StlIterator<std::bidirectional_iterator_tag, Iterator, TheItemType, true> const_iterator;
+
+  //! Returns an iterator pointing to the first element in the sequence.
+  iterator begin() const { return Iterator (*this, true); }
+
+  //! Returns an iterator referring to the past-the-end element in the sequence.
+  iterator end() const { Iterator anIter (*this, false); anIter.Next(); return anIter; }
+  
+  //! Returns a const iterator pointing to the first element in the sequence.
+  const_iterator cbegin() const { return Iterator (*this, true); }
+
+  //! Returns a const iterator referring to the past-the-end element in the sequence.
+  const_iterator cend() const { Iterator anIter (*this, false); anIter.Next(); return anIter; }
+
  public:
   // ---------- PUBLIC METHODS ------------
 

src/NCollection/NCollection_StlIterator.hxx

@@ -0,0 +1,246 @@
+// Created on: 2014-04-15
+// Created by: Denis BOGOLEPOV
+// Copyright (c) 2014 OPEN CASCADE SAS
+//
+// This file is part of Open CASCADE Technology software library.
+//
+// This library is free software; you can redistribute it and/or modify it under
+// the terms of the GNU Lesser General Public License version 2.1 as published
+// by the Free Software Foundation, with special exception defined in the file
+// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
+// distribution for complete text of the license and disclaimer of any warranty.
+//
+// Alternatively, this file may be used under the terms of Open CASCADE
+// commercial license or contractual agreement.
+
+#ifndef NCollection_StlIterator_HeaderFile
+#define NCollection_StlIterator_HeaderFile
+
+#include <Standard_Assert.hxx>
+#include <iterator>
+
+// This file uses C++11 utilities like std::is_base<>, which are not 
+// available in some environments (e.g. MSVC includes them since VS 2008).
+// Hence here we define our own implementation of these tools in namespace opencascade.
+// When all compilers support this, this namespace can be removed and replaced by std.
+namespace opencascade
+{
+  template<bool Condition, typename T>
+  struct enable_if
+  {
+    typedef T type;
+  };
+  
+  template<typename T>
+  struct enable_if<false, T>
+  {
+  };
+  
+  template<typename T1, typename T2>
+  struct is_same
+  {
+    enum { value = 0 };
+  };
+  
+  template<typename T>
+  struct is_same<T, T>
+  {
+    enum { value = 1 };
+  };
+  
+  template<bool Condition, typename TypeTrue, typename TypeFalse>
+  struct conditional
+  {
+    typedef TypeTrue type;
+  };
+
+  template<typename TypeTrue, typename TypeFalse>
+  struct conditional<false, TypeTrue, TypeFalse>
+  {
+    typedef TypeFalse type;
+  };
+}
+
+//! Helper class that allows to use NCollection iterators as STL iterators.
+//! NCollection iterator can be extended to STL iterator of any category by
+//! adding necessary methods: STL forward iterator requires IsEqual method,
+//! STL bidirectional iterator requires Previous method, and STL random access
+//! iterator requires Offset and Differ methods. See NCollection_Vector as
+//! example of declaring custom STL iterators.
+template<class Category, class BaseIterator, class ItemType, bool IsConstant>
+class NCollection_StlIterator : private BaseIterator, 
+  public std::iterator<Category, ItemType, ptrdiff_t,
+                       typename opencascade::conditional<IsConstant, const ItemType*, ItemType*>::type,
+                       typename opencascade::conditional<IsConstant, const ItemType&, ItemType&>::type>
+{
+public:
+
+  //! Default constructor
+  NCollection_StlIterator () {}
+
+  //! Constructor from NCollection iterator
+  NCollection_StlIterator (const BaseIterator& theIterator)
+    : BaseIterator (theIterator)
+  { }
+
+  //! Cast from non-const variant to const one
+  NCollection_StlIterator (const NCollection_StlIterator<Category, BaseIterator, ItemType, false>& theIterator)
+    : BaseIterator (theIterator)
+  { }
+
+  //! Assignment of non-const iterator to const one
+  NCollection_StlIterator& operator= (const NCollection_StlIterator<Category, BaseIterator, ItemType, false>& theIterator)
+  {
+    BaseIterator::operator= (theIterator);
+    return *this;
+  }
+
+  friend class NCollection_StlIterator<Category, BaseIterator, ItemType, !IsConstant>;
+
+protected: //! @name methods related to forward STL iterator
+
+  // Note: Here we use SFINAE (Substitution failure is not an error) to choose
+  // an appropriate method based on template arguments (at instantiation time).
+
+  template<bool Condition>
+  typename opencascade::enable_if<!Condition, ItemType&>::type Reference()
+  {
+    return BaseIterator::ChangeValue();
+  }
+
+  template<bool Condition>
+  typename opencascade::enable_if<Condition, const ItemType&>::type Reference()
+  {
+    return BaseIterator::Value();
+  }
+
+public: //! @name methods related to forward STL iterator
+
+  //! Test for equality
+  bool operator== (const NCollection_StlIterator& theOther) const
+  {
+    return BaseIterator::More() == theOther.More() &&
+           (!BaseIterator::More() || BaseIterator::IsEqual (theOther));
+  }
+
+  //! Test for inequality
+  bool operator!= (const NCollection_StlIterator& theOther) const
+  {
+    return !(*this == theOther);
+  }
+
+  //! Get reference to current item
+  typename NCollection_StlIterator::reference operator*()
+  {
+    return Reference<IsConstant>();
+  }
+
+  //! Dereferencing operator
+  typename NCollection_StlIterator::pointer operator->()
+  {
+    return &Reference<IsConstant>();
+  }
+
+  //! Prefix increment
+  NCollection_StlIterator& operator++()
+  {
+    BaseIterator::Next();
+    return *this;
+  }
+
+  //! Postfix increment
+  NCollection_StlIterator operator++(int)
+  {
+    const NCollection_StlIterator theOld (*this);
+    ++(*this);
+    return theOld;
+  }
+
+public: //! @name methods related to bidirectional STL iterator
+  
+  //! Prefix decrement
+  NCollection_StlIterator& operator--()
+  {
+    Standard_STATIC_ASSERT((opencascade::is_same<std::bidirectional_iterator_tag,Category>::value ||
+                            opencascade::is_same<std::random_access_iterator_tag,Category>::value));
+    BaseIterator::Previous();
+    return *this;
+  }
+  
+  //! Postfix decrement
+  NCollection_StlIterator operator--(int)
+  {
+    NCollection_StlIterator theOld (*this);
+    --(*this);
+    return theOld;
+  }
+  
+public: //! @name methods related to random access STL iterator
+
+  //! Move forward
+  NCollection_StlIterator& operator+= (typename NCollection_StlIterator::difference_type theOffset)
+  {
+    Standard_STATIC_ASSERT((opencascade::is_same<std::random_access_iterator_tag,Category>::value));
+    BaseIterator::Offset (theOffset);
+    return *this;
+  }
+
+  //! Addition
+  NCollection_StlIterator operator+ (typename NCollection_StlIterator::difference_type theOffset) const
+  {
+    NCollection_StlIterator aTemp (*this);
+    return aTemp += theOffset;
+  }
+
+  //! Move backward
+  NCollection_StlIterator& operator-= (typename NCollection_StlIterator::difference_type theOffset)
+  {
+    return *this += -theOffset;
+  }
+
+  //! Decrease
+  NCollection_StlIterator operator- (typename NCollection_StlIterator::difference_type theOffset) const
+  {
+    NCollection_StlIterator aTemp (*this);
+    return aTemp += -theOffset;
+  }
+
+  //! Difference
+  typename NCollection_StlIterator::difference_type operator- (const NCollection_StlIterator& theOther) const
+  {
+    Standard_STATIC_ASSERT((opencascade::is_same<std::random_access_iterator_tag,Category>::value));
+    return BaseIterator::Differ (theOther);
+  }
+
+  //! Get item at offset from current
+  typename NCollection_StlIterator::reference operator[] (typename NCollection_StlIterator::difference_type theOffset) const
+  {
+    return *(*this + theOffset);
+  }
+  
+  //! Comparison
+  bool operator< (const NCollection_StlIterator& theOther) const
+  {
+    return (*this - theOther) < 0;
+  }
+
+  //! Comparison
+  bool operator> (const NCollection_StlIterator& theOther) const
+  {
+    return theOther < *this;
+  }
+
+  //! Comparison
+  bool operator<= (const NCollection_StlIterator& theOther) const
+  {
+    return !(theOther < *this);
+  }
+
+  //! Comparison
+  bool operator>= (const NCollection_StlIterator& theOther) const
+  {
+    return !(*this < theOther);
+  }
+};
+
+#endif // NCollection_StlIterator_HeaderFile

src/NCollection/NCollection_Vector.hxx

@@ -18,6 +18,7 @@
 
 #include <NCollection_BaseVector.hxx>
 #include <NCollection_BaseCollection.hxx>
+#include <NCollection_StlIterator.hxx>
 
 //! Class NCollection_Vector (dynamic array of objects)
 //!
@@ -45,8 +46,10 @@ template <class TheItemType> class NCollection_Vector
   public NCollection_BaseVector
 {
 public:
+  //! STL-compliant typedef for value type
+  typedef TheItemType value_type;
 
-  typedef TheItemType TheItemTypeD;
+public:
 
   //! Nested class Iterator
   class Iterator : public NCollection_BaseCollection<TheItemType>::Iterator,
@@ -58,8 +61,8 @@ public:
     Iterator() {}
 
     //! Constructor with initialisation
-    Iterator (const NCollection_Vector& theVector)
+    Iterator (const NCollection_Vector& theVector, Standard_Boolean theToEnd = Standard_False)
-    : NCollection_BaseVector::Iterator (theVector) {}
+    : NCollection_BaseVector::Iterator (theVector, theToEnd) {}
 
     //! Copy constructor
     Iterator (const Iterator& theOther)
@@ -84,12 +87,30 @@ public:
       return moreV();
     }
 
-    //! Make step
+    //! Increment operator.
     virtual void Next()
     {
       nextV();
     }
 
+    //! Decrement operator.
+    virtual void Previous()
+    {
+      prevV();
+    }
+
+    //! Offset operator.
+    virtual void Offset (ptrdiff_t theOffset)
+    {
+      offsetV ((int)theOffset);
+    }
+
+    //! Difference operator.
+    virtual ptrdiff_t Differ (const Iterator& theOther) const
+    {
+      return differV (theOther);
+    }
+
     //! Constant value access
     virtual const TheItemType& Value() const
     {
@@ -102,8 +123,35 @@ public:
       return ((TheItemType* )curBlockV()->DataPtr)[myCurIndex];
     }
 
+    //! Performs comparison of two iterators.
+    virtual Standard_Boolean IsEqual (const Iterator& theOther) const
+    {
+      return myVector    == theOther.myVector
+          && myCurIndex  == theOther.myCurIndex
+          && myEndIndex  == theOther.myEndIndex  
+          && myICurBlock == theOther.myICurBlock
+          && myIEndBlock == theOther.myIEndBlock;
+    }
   };
 
+  //! Shorthand for a regular iterator type.
+  typedef NCollection_StlIterator<std::random_access_iterator_tag, Iterator, TheItemType, false> iterator;
+
+  //! Shorthand for a constant iterator type.
+  typedef NCollection_StlIterator<std::random_access_iterator_tag, Iterator, TheItemType, true> const_iterator;
+
+  //! Returns an iterator pointing to the first element in the vector.
+  iterator begin() const { return Iterator (*this, false); }
+
+  //! Returns an iterator referring to the past-the-end element in the vector.
+  iterator end() const { return Iterator (*this, true); }
+
+  //! Returns a const iterator pointing to the first element in the vector.
+  const_iterator cbegin() const { return Iterator (*this, false); }
+
+  //! Returns a const iterator referring to the past-the-end element in the vector.
+  const_iterator cend() const { return Iterator (*this, true); }
+
 public: //! @name public methods
 
   //! Constructor
@@ -297,7 +345,7 @@ private: //! @name private methods
     {
       for (Standard_Integer anItemIter = 0; anItemIter < theBlock.Size; ++anItemIter)
       {
-        ((TheItemType* )theBlock.DataPtr)[anItemIter].~TheItemTypeD();
+        ((TheItemType* )theBlock.DataPtr)[anItemIter].~TheItemType();
       }
       anAllocator->Free (theBlock.DataPtr);
       theBlock.DataPtr = NULL;

src/QANCollection/FILES

@@ -5,6 +5,7 @@ QANCollection1.cxx
 QANCollection2.cxx
 QANCollection3.cxx
 QANCollection4.cxx
+QANCollection_Stl.cxx
 QANCollection_Common.cxx
 QANCollection_Common.hxx
 QANCollection_Common2.hxx

src/QANCollection/QANCollection.cdl

@@ -51,5 +51,6 @@ is
     Commands2(DI : in out Interpretor from Draw);
     Commands3(DI : in out Interpretor from Draw);
     Commands4(DI : in out Interpretor from Draw);
+    CommandsStl(DI : in out Interpretor from Draw);
 
 end;

src/QANCollection/QANCollection.cxx

@@ -19,10 +19,11 @@
 #include <gp_Pnt.hxx>
 //#include <QANCollection_Common.hxx>
 
-void QANCollection::Commands(Draw_Interpretor& theCommands) {
+void QANCollection::Commands (Draw_Interpretor& theCommands)
+{
   QANCollection::Commands1   (theCommands);
   QANCollection::Commands2   (theCommands);
   QANCollection::Commands3   (theCommands);
   QANCollection::Commands4   (theCommands);
-  return;
+  QANCollection::CommandsStl (theCommands);
 }

src/QANewModTopOpe/QANewModTopOpe_Glue_shell.cxx

@@ -1356,7 +1356,7 @@ QANewModTopOpe_Glue::SectionInsideFace(const TopoDS_Face& theFace,
     // check if vertices of aSEdge contacts edges of aFace
     TopoDS_Iterator aIter (aSEdge, Standard_False);
     for (; aIter.More(); aIter.Next()) {
-      const TopoDS_Vertex& aSVer = TopoDS::Vertex (aIter.Value());
+      TopoDS_Vertex aSVer = TopoDS::Vertex (aIter.Value());
       if (aSVer.Orientation() != TopAbs_FORWARD &&
 	  aSVer.Orientation() != TopAbs_REVERSED) continue;
 

src/QANewModTopOpe/QANewModTopOpe_Tools.cxx

@@ -31,9 +31,6 @@
 #include <TopTools_IndexedMapOfShape.hxx>
 #include <TopTools_DataMapOfIntegerShape.hxx>
 
-#include <TCollection_CompareOfReal.hxx>
-#include <SortTools_QuickSortOfReal.hxx>
-
 #include <TColStd_Array1OfReal.hxx>
 #include <TColStd_IndexedMapOfReal.hxx>
 #include <TColStd_ListOfInteger.hxx>
@@ -48,6 +45,9 @@
 #include <BOPDS_CommonBlock.hxx>
 #include <BOPTools_AlgoTools3D.hxx>
 
+#include <NCollection_Array1.hxx>
+#include <algorithm>
+
 static Standard_Boolean AddShapeToHistoryMap(const TopoDS_Shape& theOldShape,
                                              const TopoDS_Shape& theNewShape,
                                              TopTools_IndexedDataMapOfShapeListOfShape& theHistoryMap);
@@ -815,7 +815,7 @@ void SortVertexOnEdge(const TopoDS_Edge&          theEdge,
     mapiv.Bind(iv,v);
   }
   Standard_Integer nv = mapiv.Extent();
-  TColStd_Array1OfReal tabpar(1,nv);
+  NCollection_Array1<Standard_Real> tabpar(1,nv);
   Standard_Integer i = 0;
 
   for ( i = 1; i <= nv; i++) {
@@ -823,8 +823,7 @@ void SortVertexOnEdge(const TopoDS_Edge&          theEdge,
     tabpar.SetValue(i,p);
   }
   theListOfVertexSorted.Clear();
-  TCollection_CompareOfReal compare;
+  std::sort (tabpar.begin(), tabpar.end());
-  SortTools_QuickSortOfReal::Sort(tabpar, compare);
 
   for (i = 1; i <= nv; i++) {
     Standard_Real par = tabpar.Value(i);

src/TopOpeBRepTool/TopOpeBRepTool_TOOL.cxx

@@ -41,8 +41,7 @@
 #include <TopTools_DataMapOfIntegerShape.hxx>
 #include <TColStd_Array1OfReal.hxx>
 #include <TColStd_IndexedMapOfReal.hxx>
-#include <TCollection_CompareOfReal.hxx>
+#include <NCollection_Array1.hxx>
-#include <SortTools_QuickSortOfReal.hxx>
 #include <BRepLProp_CLProps.hxx>
 #include <GeomLProp_SLProps.hxx>
 #include <gp_Torus.hxx>
@@ -51,6 +50,7 @@
 #include <Bnd_Box.hxx>
 #include <BRepBndLib.hxx>
 #include <ElCLib.hxx>
+#include <algorithm>
 
 #define M_FORWARD(sta)  (sta == TopAbs_FORWARD)
 #define M_REVERSED(sta) (sta == TopAbs_REVERSED)
@@ -335,7 +335,7 @@ static void FUN_tool_sortVonE(TopTools_ListOfShape& lov, const TopoDS_Edge E)
     mapiv.Bind(iv,v);
   }
   Standard_Integer nv = mapiv.Extent();
-  TColStd_Array1OfReal tabpar(1,nv);
+  NCollection_Array1<Standard_Real> tabpar(1,nv);
 //  for (Standard_Integer i = 1; i <= nv; i++) {
   Standard_Integer i ;
   for ( i = 1; i <= nv; i++) {
@@ -344,7 +344,7 @@ static void FUN_tool_sortVonE(TopTools_ListOfShape& lov, const TopoDS_Edge E)
   }
   
   TopTools_ListOfShape newlov;
-  TCollection_CompareOfReal compare; SortTools_QuickSortOfReal::Sort(tabpar, compare);
+  std::sort (tabpar.begin(), tabpar.end());
   for (i = 1; i <= nv; i++) {
     Standard_Real par = tabpar.Value(i);
     Standard_Integer iv = mappar.FindIndex(par);