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/* gsl_inline.h
*
* Copyright (C) 2008, 2009 Brian Gough
*
* 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 3 of the License, 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.
*/
#ifndef __GSL_INLINE_H__
#define __GSL_INLINE_H__
/* In recent versiions of GCC, the inline keyword has two different
forms: GNU and C99.
In GNU mode we can use 'extern inline' to make inline functions
work like macros. The function is only inlined--it is never output
as a definition in an object file.
In the new C99 mode 'extern inline' has a different meaning--it
causes the definition of the function to be output in each object
file where it is used. This will result in multiple-definition
errors on linking. The 'inline' keyword on its own (without
extern) has the same behavior as the original GNU 'extern inline'.
The C99 style is the default with -std=c99 in GCC 4.3.
This header file allows either form of inline to be used by
redefining the macros INLINE_DECL and INLINE_FUN. These are used
in the public header files as
INLINE_DECL double gsl_foo (double x);
#ifdef HAVE_INLINE
INLINE_FUN double gsl_foo (double x) { return x+1.0; } ;
#endif
*/
#ifdef HAVE_INLINE
# if defined(__GNUC_STDC_INLINE__) || defined(GSL_C99_INLINE) || defined(HAVE_C99_INLINE)
# define INLINE_DECL inline /* use C99 inline */
# define INLINE_FUN inline
# else
# define INLINE_DECL /* use GNU extern inline */
# define INLINE_FUN extern inline
# endif
#else
# define INLINE_DECL /* */
#endif
/* Range checking conditions in headers do not require any run-time
tests of the global variable gsl_check_range. They are enabled or
disabled in user code at compile time with GSL_RANGE_CHECK macro.
See also build.h. */
#define GSL_RANGE_COND(x) (x)
#endif /* __GSL_INLINE_H__ */
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