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/** \file libgphoto2_port/compiletime-assert.h
* \brief Allow compile time assertions with or without C11.
*
* C11 has added static_assert(EXPR, MSG) to assert.h, but C99 only
* knows runtime assertions using assert(EXPR). This defines
* COMPILETIME_ASSERT(EXPR) which works with both C99 and C11 and
* later.
*
* \author Copyright (C) 2010-2021 Hans Ulrich Niedermann <hun@n-dimensional.de>
*
* \copyright GNU Lesser General Public License 2 or later
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
#ifndef LIBGPHOTO2_PORT_COMPILETIME_ASSERT_H
#define LIBGPHOTO2_PORT_COMPILETIME_ASSERT_H
#if (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L))
/* C11 or later */
#include <assert.h>
/** Compiletime assertion for use inside a function. */
#define COMPILETIME_ASSERT(CONDITION) \
static_assert((CONDITION), #CONDITION)
/** Compiletime assertion for use outside a function. */
#define BARE_COMPILETIME_ASSERT(CONDITION) \
static_assert((CONDITION), #CONDITION)
#else
/* before C11 */
/** Compiletime assertion for use inside a function. */
#define COMPILETIME_ASSERT(CONDITION) \
switch (0) { /* error here means assertion has failed */ \
case 0: /* error here means assertion has failed */ \
case (CONDITION): /* error here means assertion has failed */ \
break; \
}
/** \internal used by BARE_COMPILETIME_ASSERT() macro */
#define MAKE_BARE_COMPILETIME_ASSERT_NAME \
MAKE_BARE_COMPILETIME_ASSERT_NAME1(COMPILETIME_ASSERT_fails_in_line, \
__LINE__)
/** \internal used by BARE_COMPILETIME_ASSERT() macro */
#define MAKE_BARE_COMPILETIME_ASSERT_NAME1(BASE, PARAM) \
MAKE_BARE_COMPILETIME_ASSERT_NAME2(BASE, PARAM)
/** \internal used by BARE_COMPILETIME_ASSERT() macro */
#define MAKE_BARE_COMPILETIME_ASSERT_NAME2(BASE, PARAM) \
BASE ## _ ## PARAM
/** Compiletime assertion for use outside a function. */
#define BARE_COMPILETIME_ASSERT(CONDITION) \
void MAKE_BARE_COMPILETIME_ASSERT_NAME(void); \
void MAKE_BARE_COMPILETIME_ASSERT_NAME(void) \
{ \
COMPILETIME_ASSERT(CONDITION); \
}
#endif /* after/before C11 */
#endif /* !defined(LIBGPHOTO2_PORT_COMPILETIME_ASSERT_H) */
/*
* Local Variables:
* c-file-style:"linux"
* indent-tabs-mode:t
* End:
*/
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