/* 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__ */