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// Copyright: Matra-Datavision 1991
// File: PCollection_BreadthFirstIterator.gxx
// Created: Wed May 29 17:43:06 1991
// Author: Denis PASCAL
// <dp>
// Revised by: Mireille MERCIEN
// Sep,7 1992
#include <Standard_NoMoreObject.hxx>
#include <Standard_NoSuchObject.hxx>
//---------------------------------------------------------------------------
// Constructor
//---------------------------------------------------------------------------
PCollection_BreadthFirstIterator::
PCollection_BreadthFirstIterator (const Handle(PCollection_Vertex)& V)
{
Visited = new PCollection_SetOfVertex;
Ready = new PCollection_QueueOfVertex;
Visited->Add(V);
//mip Ready->Add(V);
Ready->Push(V);
HasMore = !(Ready->IsEmpty());
}
//---------------------------------------------------------------------------
// More
//---------------------------------------------------------------------------
Boolean PCollection_BreadthFirstIterator::More () const
{
return HasMore;
}
//---------------------------------------------------------------------------
// Next
//---------------------------------------------------------------------------
void PCollection_BreadthFirstIterator::Next ()
{
if (!HasMore) Standard_NoMoreObject::Raise();
Handle(PCollection_Vertex) w1 = Ready->Front();
Ready->Pop();
PCollection_FrontEdgesIterator It(w1);
while (It.More()) {
Handle(PCollection_Vertex) w2 = It.Value()->Destination();
if (! (Visited->Contains(w2))) {
//mip Ready->Add(w2);
Ready->Push(w2);
Visited->Add(w2);
}
It.Next();
}
HasMore = !(Ready->IsEmpty());
}
//---------------------------------------------------------------------------
// Value
//---------------------------------------------------------------------------
Handle(PCollection_Vertex) PCollection_BreadthFirstIterator::Value () const
{
if (!HasMore) Standard_NoSuchObject::Raise();
return Ready->Front();
}
//---------------------------------------------------------------------------
// Clear
//---------------------------------------------------------------------------
void PCollection_BreadthFirstIterator::Clear ()
{
HasMore = False;
}
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