34 lines
1.2 KiB
C
34 lines
1.2 KiB
C
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/* Determine alignment of types.
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Copyright (C) 2003-2004, 2006, 2009 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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#ifndef _ALIGNOF_H
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#define _ALIGNOF_H
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#include <stddef.h>
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/* Determine the alignment of a type at compile time. */
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#if defined __GNUC__
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# define alignof __alignof__
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#elif defined __cplusplus
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template <class type> struct alignof_helper { char __slot1; type __slot2; };
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# define alignof(type) offsetof (alignof_helper<type>, __slot2)
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#else
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# define alignof(type) offsetof (struct { char __slot1; type __slot2; }, __slot2)
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#endif
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#endif /* _ALIGNOF_H */
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