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fac0307756
Introduce a new macro "container_of" to convert a member point to a point to the containing struct with relative type saftey. Stolen from Linux. I'd rather this was in a different header to "qtypes.h", but that's the best place for it at the moment, without creating a new header. Replace the cvar_for_completion macro and add helper functions stree_entry and completion_entry to remove the rb_entry macro. This ends up looking a bit neater. Signed-off-by: Tyrann <tyrann@disenchant.net>
44 lines
1.4 KiB
C
44 lines
1.4 KiB
C
/*
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) 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.
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See the 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
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef QTYPES_H
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#define QTYPES_H
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typedef unsigned char byte;
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// KJB Undefine true and false defined in SciTech's DEBUG.H header
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#undef true
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#undef false
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typedef enum { false, true } qboolean;
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/**
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* container_of - cast a member of a structure out to the containing structure
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* @ptr: the pointer to the member.
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* @type: the type of the container struct this is embedded in.
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* @member: the name of the member within the struct.
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*
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*/
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#define container_of(ptr, type, member) ({ \
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const typeof( ((type *)0)->member ) *__mptr = (ptr); \
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(type *)( (char *)__mptr - offsetof(type,member) );})
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#endif /* QTYPES_H */
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