48 lines
1.1 KiB
C++
48 lines
1.1 KiB
C++
// bigfix.h
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//
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// Copyright (C) 2001, Chris Laurel <claurel@shatters.net>
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//
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// 128-bit fixed point (64.64) numbers for high-precision celestial
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// coordinates. When you need millimeter accurate navigation across a scale
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// of thousands of light years, doubles just don't do it.
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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#ifndef _BIGFIX_H_
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#define _BIGFIX_H_
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#define N_WORDS 8
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class BigFix
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{
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public:
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BigFix();
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BigFix(int);
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BigFix(double);
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operator double() const;
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operator float() const;
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BigFix operator-() const;
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friend BigFix operator+(BigFix, BigFix);
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friend BigFix operator-(BigFix, BigFix);
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friend BigFix operator*(BigFix, BigFix);
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friend bool operator==(BigFix, BigFix);
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friend bool operator!=(BigFix, BigFix);
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int sign();
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// for debugging
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void dump();
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private:
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unsigned short n[N_WORDS]; // high 16-bits is n[N_WORDS - 1]
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};
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#endif // _BIGFIX_H_
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