77 lines
2.3 KiB
C++
77 lines
2.3 KiB
C++
// Copyright 2002, 2003, 2004, 2005, 2006 David Hilvert <dhilvert@auricle.dyndns.org>,
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// <dhilvert@ugcs.caltech.edu>
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/* This file is part of the Anti-Lamenessing Engine.
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The Anti-Lamenessing Engine is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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The Anti-Lamenessing Engine is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with the Anti-Lamenessing Engine; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __ale_math_h__
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#define __ale_math_h__
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/*
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* Certain versions of Mac OSX may disable math.h definitions of is*() macros
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* when iostream is included, so we include the latter here.
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*/
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#include <math.h>
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#include <iostream>
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/*
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* isnan() and isinf() code logic are based on those noted in the GNU Autoconf
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* manual, by the Free Software Foundation:
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*
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* http://www.gnu.org/software/autoconf/manual/html_node/Function-Portability.html
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*
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* As C++ is available here, we use C++ overloading instead of sizeof()
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* switches to handle different types.
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*/
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#define FIXED16 4
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#define FIXED32 5
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#if ALE_COLORS == FIXED16 || ALE_COLORS == FIXED32 \
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|| ALE_COORDINATES == FIXED16 || ALE_COORDINATES == FIXED32
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/*
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* Since we need custom isnan and isinf for fixed-point values, we disable any
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* such macros provided.
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*/
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#undef isnan
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#undef isinf
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#endif
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#undef FIXED16
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#undef FIXED32
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#ifndef isnan
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# define isnan(x) ale_isnan(x)
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static inline int ale_isnan(float x) { return x != x; }
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static inline int ale_isnan(double x) { return x != x; }
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static inline int ale_isnan(long double x) { return x != x; }
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#endif
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#ifndef isinf
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# define isinf(x) ale_isinf(x)
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static inline int ale_isinf(float x) { return isnan (x - x); }
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static inline int ale_isinf(double x) { return isnan (x - x); }
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static inline int ale_isinf(long double x) { return isnan (x - x); }
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#endif
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#endif
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