GB/GB_Vertex.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * Produced by:
 *      Cristin Barghiel
 *      Side Effects Software Inc.
 *      20 Maud St.
 *      Toronto, Ontario,  M5V 2M5
 *      Canada
 *      416-366-4607
 *
 * NAME:        Geometry Library (C++)
 *
 * COMMENTS:
 *      The vertex class. As opposed to points, all vertices are unique.
 *
 * WARNING: Try to avoid using the assignment operator '=' because it is
 *          shallow in the attribute component!
 *
 */

#ifndef __GB_Vertex_H__
#define __GB_Vertex_H__

#include "GB_API.h"
#include "GB_Element.h"

class GB_API GB_Vertex {
public:
    GB_Vertex(GB_Element *pt = 0) { myPoint = pt; }

    // Avoid using this c-tor because it's dangerously shallow!
    GB_Vertex(const GB_Vertex &vtx)     { myPoint = vtx.myPoint; } // shallow!

    virtual ~GB_Vertex() { }

    virtual void         setPt    (GB_Element *pt) { myPoint = pt; }
    GB_Element          *getBasePt(void) const { return myPoint; }

    void                 steal(GB_Vertex &src)
                         {
                             setPt(src.myPoint);
                             src.setPt(0);
                         }

    void                 copy(const GB_Vertex *src)
                         {
                             setPt(src->myPoint);
                         }

    // Avoid using operator=() because it's dangerously shallow!
    GB_Vertex   &operator=(const GB_Vertex &vtx)
                         {
                             if (this != &vtx)
                                 setPt(vtx.myPoint);
                             return *this;

                         }
    int                  operator==(const GB_Vertex &vtx) const
                         {
                             // Trivial check to make it simple. Do not change.
                             return this == &vtx;
                         }

private:
    GB_Element          *myPoint;
};

#endif

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