New file, from gnulib.

1 files changed, 55 insertions, 0 deletions

diff --git a/lib/verify.h b/lib/verify.h
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+/* Compile-time assert-like macros.
+
+   Copyright (C) 2005 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+/* Written by Paul Eggert and Jim Meyering.  */
+
+#ifndef VERIFY_H
+# define VERIFY_H 1
+
+/* Each of these macros verifies that its argument R is a nonzero
+   constant expression.  To be portable, R's type must be integer (or
+   boolean).  Unlike assert, there is no run-time overhead.
+
+   There are two macros, since no single macro can be used in all
+   contexts in C.  verify_true (R) is for scalar contexts, where it
+   may be cast to void if need be.  verify (R) is for declaration
+   contexts, e.g., the top level.
+
+   The symbols verify_error_if_negative_size__ and verify_function__
+   are private to this header.  */
+
+/* Verify requirement R at compile-time, as an integer constant expression.
+   Return true.  */
+
+# ifdef __cplusplus
+template <int w>
+  struct verify_type__ { unsigned int verify_error_if_negative_size__: w; };
+#  define verify_true(R) \
+     (!!sizeof (verify_type__<(R) ? 1 : -1>))
+# else
+#  define verify_true(R) \
+     (!!sizeof \
+      (struct { unsigned int verify_error_if_negative_size__: (R) ? 1 : -1; }))
+# endif
+
+/* Verify requirement R at compile-time, as a declaration without a
+   trailing ';'.  */
+
+# define verify(R) extern int (* verify_function__ (void)) [verify_true (R)]
+
+#endif