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/*
* Function attribute declarations for the Fast Light Tool Kit (FLTK).
*
* Copyright 1998-2023 by Bill Spitzak and others.
*
* This library is free software. Distribution and use rights are outlined in
* the file "COPYING" which should have been included with this file. If this
* file is missing or damaged, see the license at:
*
* https://www.fltk.org/COPYING.php
*
* Please see the following page on how to report bugs and issues:
*
* https://www.fltk.org/bugs.php
*/
/**
\file fl_attr.h
This file defines compiler-specific macros
*/
#ifndef _FL_fl_attr_h_
#define _FL_fl_attr_h_
#ifdef FL_DOXYGEN
/**
This macro makes it safe to use the C++11 keyword \c override with
older compilers.
*/
#define FL_OVERRIDE override
/** To be used in prototypes with a variable list of arguments.
This macro helps detection of mismatches between format string and
argument list at compilation time.
Usage example: FL/fl_ask.H
*/
#define __fl_attr(x)
#else
/*
The GNUC-specific attribute appearing below in prototypes with a variable
list of arguments helps detection of mismatches between format string and
argument list at compilation time.
Examples: see fl_ask.H
*/
#ifdef __GNUC__
# define __fl_attr(x) __attribute__ (x)
#else
# define __fl_attr(x)
#endif
#ifdef __cplusplus
// Visual Studio defines __cplusplus = '199711L' which is not helpful.
// We assume that Visual Studio 2015 (1900) and later support the
// 'override' keyword. For VS version number encoding see:
// https://learn.microsoft.com/en-us/cpp/preprocessor/predefined-macros
#if defined(_MSC_VER) && (_MSC_VER >= 1900)
#define FL_OVERRIDE override
#else // not Visual Studio or an older version
#if (__cplusplus >= 202002L)
// put here definitions applying to C++20 and above
#endif
#if (__cplusplus >= 201703L)
// put here definitions applying to C++17 and above
#endif
#if (__cplusplus >= 201402L)
// put here definitions applying to C++14 and above
#endif
#if (__cplusplus >= 201103L)
// put here definitions applying to C++11 and above
#define FL_OVERRIDE override
#else
// replace non-existing `override` with no-op
#define FL_OVERRIDE
#endif
#if (__cplusplus >= 199711L)
// put here definitions applying to C++98 and above
#endif
#endif /* not Visual Studio */
#else
/* C, not C++ */
#endif /* __cplusplus */
#endif /* FL_DOXYGEN */
#endif /* !_FL_fl_attr_h_ */
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