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8dbb507ee8
so we can once again use a positive bitfield width of 1 -- now we don't have to explain why we were using a bitfield width of 2.
47 lines
1.7 KiB
C
47 lines
1.7 KiB
C
/* Compile-time assert-like macros.
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Copyright (C) 2005 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 2, 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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/* Written by Paul Eggert and Jim Meyering. */
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#ifndef VERIFY_H
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# define VERIFY_H 1
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/* Each of these macros verifies that its argument R is a nonzero
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constant expression. To be portable, R's type must be integer (or
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boolean). Unlike assert, there is no run-time overhead. */
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/* A type that is valid if and only if R is a nonzero constant expression.
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The symbols verify_type__ and verify_error_if_negative_size__ are
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private to this header file. */
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# define verify_type__(R) \
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struct { unsigned int verify_error_if_negative_size__ : (R) ? 1 : -1; }
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/* Verify requirement R at compile-time, as a declaration. */
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# define verify(R) \
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extern int (* verify_function__ (void)) [sizeof (verify_type__ (R))]
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/* Verify requirement R at compile-time, as an expression.
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This macro can be used in some contexts where verify cannot, and vice versa.
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Return void. */
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# define verify_expr(R) ((void) ((verify_type__ (R) *) 0))
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#endif
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