86 lines
2.9 KiB
C++
86 lines
2.9 KiB
C++
#ifndef __verireal_H
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#define __verireal_H
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/*
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* Copyright (c) 1999-2004 Stephen Williams (steve@icarus.com)
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*
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* This source code is free software; you can redistribute it
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* and/or modify it in source code form under the terms of the GNU
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* General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program; 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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# include "config.h"
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#ifdef HAVE_IOSFWD
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# include <iosfwd>
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#else
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class ostream;
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#endif
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using namespace std;
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class verinum;
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/*
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* This class holds a floating point decimal number. The number is
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* stored as an integer mantissa and a power of 10. The mantissa is an
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* integer so that decimal numbers in the source (which are decimal)
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* can be stored exactly.
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*/
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class verireal {
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friend ostream& operator<< (ostream&, const verireal&);
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friend verireal operator+ (const verireal&, const verireal&);
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friend verireal operator- (const verireal&, const verireal&);
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friend verireal operator* (const verireal&, const verireal&);
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friend verireal operator/ (const verireal&, const verireal&);
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friend verireal operator/ (const verireal&, const verinum&);
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friend verireal operator% (const verireal&, const verireal&);
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friend verireal operator% (const verireal&, const verinum&);
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friend verireal pow(const verireal&, const verireal&);
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// Unary minus.
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friend verireal operator- (const verireal&);
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public:
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explicit verireal();
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explicit verireal(const char*text);
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explicit verireal(long val);
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explicit verireal(double val);
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~verireal();
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/* Return the value of the floating point number as an
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integer, rounded as needed. The shift is the power of 10 to
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multiply the value before calculating the result. So for
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example if the value is 2.5 and shift == 1, the result
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is 25. */
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long as_long(int shift =0) const;
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int64_t as_long64(int shift =0) const;
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double as_double() const;
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private:
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double value_;
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};
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extern ostream& operator<< (ostream&, const verireal&);
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extern verireal operator* (const verireal&, const verireal&);
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extern verireal operator/ (const verireal&, const verireal&);
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extern verireal operator/ (const verireal&, const verinum&);
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extern verireal operator% (const verireal&, const verireal&);
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extern verireal operator% (const verireal&, const verinum&);
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extern verireal pow(const verireal&, const verireal&);
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extern verireal operator- (const verireal&);
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#endif
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