375 lines
8.9 KiB
C
375 lines
8.9 KiB
C
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// This may look like C code, but it is really -*- C++ -*-
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/*
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Copyright (C) 1988 Free Software Foundation
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written by Doug Lea (dl@rocky.oswego.edu)
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This file is part of the GNU C++ Library. This library is free
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software; you can redistribute it and/or modify it under the terms of
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the GNU Library General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your
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option) any later version. This library is distributed in the hope
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that it will be useful, but WITHOUT ANY WARRANTY; without even the
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the GNU Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free Software
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Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _BitSet_h
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#ifdef __GNUG__
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#pragma interface
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#endif
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#define _BitSet_h 1
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#include <iostream.h>
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#include <limits.h>
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#define BITSETBITS (sizeof(short) * CHAR_BIT)
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struct BitSetRep
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{
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unsigned short len; // number of shorts in s
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unsigned short sz; // allocated slots
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unsigned short virt; // virtual 0 or 1
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unsigned short s[1]; // bits start here
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};
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extern BitSetRep* BitSetalloc(BitSetRep*, const unsigned short*,
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int, int, int);
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extern BitSetRep* BitSetcopy(BitSetRep*, const BitSetRep*);
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extern BitSetRep* BitSetresize(BitSetRep*, int);
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extern BitSetRep* BitSetop(const BitSetRep*, const BitSetRep*,
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BitSetRep*, char);
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extern BitSetRep* BitSetcmpl(const BitSetRep*, BitSetRep*);
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extern BitSetRep _nilBitSetRep;
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class BitSet;
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class BitSetBit
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{
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protected:
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BitSet* src;
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unsigned long pos;
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public:
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BitSetBit(BitSet* v, int p);
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BitSetBit(const BitSetBit& b);
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~BitSetBit();
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operator int() const;
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int operator = (int b);
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int operator = (const BitSetBit& b);
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};
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class BitSet
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{
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protected:
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BitSetRep* rep;
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public:
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// constructors
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BitSet();
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BitSet(const BitSet&);
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~BitSet();
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BitSet& operator = (const BitSet& y);
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// equality & subset tests
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friend int operator == (const BitSet& x, const BitSet& y);
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friend int operator != (const BitSet& x, const BitSet& y);
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friend int operator < (const BitSet& x, const BitSet& y);
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friend int operator <= (const BitSet& x, const BitSet& y);
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friend int operator > (const BitSet& x, const BitSet& y);
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friend int operator >= (const BitSet& x, const BitSet& y);
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// operations on self
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BitSet& operator |= (const BitSet& y);
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BitSet& operator &= (const BitSet& y);
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BitSet& operator -= (const BitSet& y);
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BitSet& operator ^= (const BitSet& y);
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void complement();
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// individual bit manipulation
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void set(int pos);
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void set(int from, int to);
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void set(); // set all
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void clear(int pos);
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void clear(int from, int to);
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void clear(); // clear all
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void invert(int pos);
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void invert(int from, int to);
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int test(int pos) const;
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int test(int from, int to) const;
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BitSetBit operator [] (int i);
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// iterators
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int first(int b = 1) const;
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int last(int b = 1) const;
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int next(int pos, int b = 1) const;
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int prev(int pos, int b = 1) const;
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int previous(int pos, int b = 1) const /* Obsolete synonym */
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{ return prev(pos, b); }
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// status
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int empty() const;
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int virtual_bit() const;
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int count(int b = 1) const;
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// convertors & IO
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friend BitSet atoBitSet(const char* s,
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char f='0', char t='1', char star='*');
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// BitSettoa is deprecated; do not use in new programs.
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friend const char* BitSettoa(const BitSet& x,
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char f='0', char t='1', char star='*');
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friend BitSet shorttoBitSet(unsigned short w);
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friend BitSet longtoBitSet(unsigned long w);
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friend ostream& operator << (ostream& s, const BitSet& x);
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void printon(ostream& s,
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char f='0', char t='1', char star='*') const;
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// procedural versions of operators
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friend void and(const BitSet& x, const BitSet& y, BitSet& r);
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friend void or(const BitSet& x, const BitSet& y, BitSet& r);
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friend void xor(const BitSet& x, const BitSet& y, BitSet& r);
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friend void diff(const BitSet& x, const BitSet& y, BitSet& r);
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friend void complement(const BitSet& x, BitSet& r);
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// misc
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void error(const char* msg) const;
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int OK() const;
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};
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typedef BitSet BitSetTmp;
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BitSet operator | (const BitSet& x, const BitSet& y);
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BitSet operator & (const BitSet& x, const BitSet& y);
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BitSet operator - (const BitSet& x, const BitSet& y);
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BitSet operator ^ (const BitSet& x, const BitSet& y);
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BitSet operator ~ (const BitSet& x);
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// These are inlined regardless of optimization
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inline int BitSet_index(int l)
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{
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return (unsigned)(l) / BITSETBITS;
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}
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inline int BitSet_pos(int l)
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{
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return l & (BITSETBITS - 1);
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}
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inline BitSet::BitSet() : rep(&_nilBitSetRep) {}
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inline BitSet::BitSet(const BitSet& x) :rep(BitSetcopy(0, x.rep)) {}
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inline BitSet::~BitSet() { if (rep != &_nilBitSetRep) delete rep; }
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inline BitSet& BitSet::operator = (const BitSet& y)
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{
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rep = BitSetcopy(rep, y.rep);
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return *this;
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}
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inline int operator != (const BitSet& x, const BitSet& y) { return !(x == y); }
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inline int operator > (const BitSet& x, const BitSet& y) { return y < x; }
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inline int operator >= (const BitSet& x, const BitSet& y) { return y <= x; }
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inline void and(const BitSet& x, const BitSet& y, BitSet& r)
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{
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r.rep = BitSetop(x.rep, y.rep, r.rep, '&');
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}
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inline void or(const BitSet& x, const BitSet& y, BitSet& r)
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{
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r.rep = BitSetop(x.rep, y.rep, r.rep, '|');
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}
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inline void xor(const BitSet& x, const BitSet& y, BitSet& r)
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{
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r.rep = BitSetop(x.rep, y.rep, r.rep, '^');
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}
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inline void diff(const BitSet& x, const BitSet& y, BitSet& r)
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{
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r.rep = BitSetop(x.rep, y.rep, r.rep, '-');
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}
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inline void complement(const BitSet& x, BitSet& r)
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{
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r.rep = BitSetcmpl(x.rep, r.rep);
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}
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#if defined(__GNUG__) && !defined(_G_NO_NRV)
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inline BitSet operator & (const BitSet& x, const BitSet& y) return r
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{
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and(x, y, r);
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}
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inline BitSet operator | (const BitSet& x, const BitSet& y) return r
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{
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or(x, y, r);
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}
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inline BitSet operator ^ (const BitSet& x, const BitSet& y) return r
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{
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xor(x, y, r);
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}
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inline BitSet operator - (const BitSet& x, const BitSet& y) return r
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{
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diff(x, y, r);
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}
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inline BitSet operator ~ (const BitSet& x) return r
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{
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::complement(x, r);
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}
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#else /* NO_NRV */
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inline BitSet operator & (const BitSet& x, const BitSet& y)
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{
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BitSet r; and(x, y, r); return r;
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}
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inline BitSet operator | (const BitSet& x, const BitSet& y)
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{
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BitSet r; or(x, y, r); return r;
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}
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inline BitSet operator ^ (const BitSet& x, const BitSet& y)
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{
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BitSet r; xor(x, y, r); return r;
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}
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inline BitSet operator - (const BitSet& x, const BitSet& y)
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{
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BitSet r; diff(x, y, r); return r;
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}
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inline BitSet operator ~ (const BitSet& x)
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{
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BitSet r; ::complement(x, r); return r;
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}
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#endif
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inline BitSet& BitSet::operator &= (const BitSet& y)
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{
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and(*this, y, *this);
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return *this;
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}
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inline BitSet& BitSet::operator |= (const BitSet& y)
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{
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or(*this, y, *this);
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return *this;
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}
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inline BitSet& BitSet::operator ^= (const BitSet& y)
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{
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xor(*this, y, *this);
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return *this;
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}
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inline BitSet& BitSet::operator -= (const BitSet& y)
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{
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diff(*this, y, *this);
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return *this;
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}
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inline void BitSet::complement()
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{
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::complement(*this, *this);
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}
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inline int BitSet::virtual_bit() const
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{
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return rep->virt;
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}
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inline int BitSet::first(int b) const
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{
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return next(-1, b);
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}
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inline int BitSet::test(int p) const
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{
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if (p < 0) error("Illegal bit index");
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int index = BitSet_index(p);
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return (index >= rep->len)? rep->virt :
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((rep->s[index] & (1 << BitSet_pos(p))) != 0);
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}
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inline void BitSet::set()
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{
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rep = BitSetalloc(rep, 0, 0, 1, 0);
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}
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inline BitSetBit::BitSetBit(const BitSetBit& b) :src(b.src), pos(b.pos) {}
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inline BitSetBit::BitSetBit(BitSet* v, int p)
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{
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src = v; pos = p;
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}
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inline BitSetBit::~BitSetBit() {}
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inline BitSetBit::operator int() const
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{
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return src->test(pos);
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}
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inline int BitSetBit::operator = (int b)
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{
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if (b) src->set(pos); else src->clear(pos); return b;
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}
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inline int BitSetBit::operator = (const BitSetBit& b)
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{
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int i = (int)b;
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*this = i;
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return i;
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}
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inline BitSetBit BitSet::operator [] (int i)
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{
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if (i < 0) error("illegal bit index");
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return BitSetBit(this, i);
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}
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#endif
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