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Initial check-in based on 2.1.5 (SGI IRIX) source tree.

/*
 *
 *  Copyright (C) 2000 Silicon Graphics, Inc.  All Rights Reserved. 
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  Further, this software is distributed without any warranty that it is
 *  free of the rightful claim of any third person regarding infringement
 *  or the like.  Any license provided herein, whether implied or
 *  otherwise, applies only to this software file.  Patent licenses, if
 *  any, provided herein do not apply to combinations of this program with
 *  other software, or any other product whatsoever.
 * 
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 *  Mountain View, CA  94043, or:
 * 
 *  http://www.sgi.com 
 * 
 *  For further information regarding this notice, see: 
 * 
 *  http://oss.sgi.com/projects/GenInfo/NoticeExplan/
 *
 */

/*--------------------------------------------------------------
 *  This is an example from the Inventor Toolmaker,
 *  chapter 3, example 2.
 *
 *  Source file for "SFDouble" field.
 *------------------------------------------------------------*/

#include "SFDouble.h"

// Defines all required member variables and functions for a
// single-value field
SO_SFIELD_SOURCE(SFDouble, double, double);

//
// Initializes the class, setting up runtime type info.
//

void
SFDouble::initClass()
{
   // This macro takes the name of the class and the name of the
   // parent class
   SO_SFIELD_INIT_CLASS(SFDouble, SoSField);
}

//
// This reads the value of a double-precision field from a
// file. It returns FALSE if the value could not be read
// successfully.
//

SbBool
SFDouble::readValue(SoInput *in)
{
   // Read a double from the input
   return in->read(value);
}

//
// This writes the value of a double-precision field to a
// file.
//

void
SFDouble::writeValue(SoOutput *out) const
{
   // Write a double
   out->write(value);
}