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58 lines
2.2 KiB
C
58 lines
2.2 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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# define GL_CONCAT0(x, y) x##y
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# define GL_CONCAT(x, y) GL_CONCAT0 (x, y)
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/* A type that is valid if and only if R is nonzero.
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R should be an integer constant expression.
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verify_type__ and verify_error_if_negative_size__ are symbols that
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are private to this header file. */
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# define verify_type__(R) \
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struct { 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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R should be an integer constant expression.
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Unlike assert, there is no run-time overhead.
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The implementation uses __LINE__ to lessen the probability of
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generating a warning that verify_function_NNN is multiply declared.
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However, even if two declarations in different files have the same
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__LINE__, the multiple declarations are still valid C89 and C99
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code because they simply redeclare the same external function, so
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no conforming compiler will reject them outright. */
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# define verify(R) \
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extern verify_type__ (R) GL_CONCAT (verify_function_, __LINE__) (void)
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/* Verify requirement R at compile-time, as an expression.
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R should be an integer constant expression.
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Unlike assert, there is no run-time overhead.
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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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