GB/GB_AttributeElem.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:
 *      Mark Elendt
 *      Side Effects Software Inc.
 *      20 Maud St.
 *      Toronto, Ontario,  M5V 2M5
 *      Canada
 *      416-366-4607
 *
 * NAME:        Geometry Library (C++)
 *
 * COMMENTS:
 *      This contains the class definition for GB_AttributeElem which is
 *      an entity that contains attributes.
 */

#ifndef __GB_AttributeElem_h__
#define __GB_AttributeElem_h__

#include "GB_API.h"
#include <stdlib.h>
#include "GB_AttributeData.h"

class GB_AttributeDict;

class GB_API GB_AttributeElem
{
public:
    void                 copyAttribData(const GB_AttributeElem *src, int sz)
                         {
                             if (sz && myAttribData.getData()) 
                                 memcpy(myAttribData.getData(),
                                       src->myAttribData.getData(), 
                                       (unsigned)sz);
                         }

    // given matching attribute dictionaries, copy the attribute data.
    // this allows for different sized attributes as long as the destination
    // attributes are at least as big as the source attributes.
    void                 copyAttribData(const GB_AttributeElem *src,
                                        const GB_AttributeDict &src_dict,
                                        const GB_AttributeDict &dest_dict);

    /// Operations to work on an individual attribute.  The handle is passed in
    /// and a pointer to the data is returned.
    template<typename T>
    T           *castAttribData(int n)
                    { return (T *)myAttribData[(unsigned)n]; }
    template<typename T>
    const T     *castAttribData(int n) const
                    { return (const T *)myAttribData[(unsigned)n]; }

    /// Operations defined on the entire set of attributes
    /// Some of these operations only apply to floating point data (e.g.
    /// scaleData()).  These methods take two GB_Details, the srcgeo is used to
    /// find the attributes available on the source geometry.  The *mygeo*
    /// parameter is used to define my attributes.

    /// getAttribData has been deprecated in favor of the template
    /// castAttribData function which preserves const-ness and eliminates
    /// the need for C-style casting of the return value.
    void SYS_DEPRECATED *getAttribData(int n) const 
                                          { return myAttribData[(unsigned)n]; }

    // For H9.1, we move the getAttrib() methods into the private section and
    // provide access to existing classes through friends.
    const GB_AttributeData      &getAttrib() const { return myAttribData; }
          GB_AttributeData      &getAttrib()       { return myAttribData; }

protected:
private:
    GB_AttributeData     myAttribData;
};

#endif

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