/*

    File:   offsetof.cpp

    Version:    1.0

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        Apple Computer, Inc. may be used to endorse or promote products derived from the

        Apple Software without specific prior written permission from Apple.  Except as

        expressly stated in this notice, no other rights or licenses, express or implied,

        are granted by Apple herein, including but not limited to any patent rights that

        may be infringed by your derivative works or by other works in which the Apple

        Software may be incorporated.

        The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

        WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

        WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR

        PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

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        IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR

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    Copyright © 2005 Apple Computer, Inc., All Rights Reserved

*/

#include <stddef.h>

struct class1 {

    int field1[100];

};

/* ISO C and C++ both say that the second parameter of offsetof() must

   be able to be part of an address constant (ISO C section 7.17

   paragraph 3).  GCC now detects this case for C++.

   Here, 'index' is not constant, so it can't go in the second

   parameter, and you must perform the computation outside the offsetof.  */

size_t get_field_offset (int index) {

#if BAD

    return offsetof (class1, field1[index]);

#else

    return offsetof (class1, field1) + index * sizeof (int);

#endif

}