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• ByReference.java

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/* Copyright (c) 2007 Timothy Wall, 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.  
 */
package com.sun.jna.ptr;

import com.sun.jna.Memory;
import com.sun.jna.NativeMapped;
import com.sun.jna.Pointer;
import com.sun.jna.PointerType;

/** Provides generic "pointer to type" functionality, often used in C
 * code to return values to the caller in addition to a function result.
 * 

 * Derived classes should define setValue(<T>)
 * and <T> getValue() methods which write to/read from
 * memory.
 * 
This class derives from PointerType instead of Memory in order to
 * restrict the API to only getValue/setValue.
 * 
NOTE: this class would ideally be replaced by a generic.
 */
public abstract class ByReference extends PointerType {
    
    protected ByReference(int dataSize) {
        setPointer(new Memory(dataSize));
    }
}