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// -*- C++ -*-
//=============================================================================
/**
* @file Dynamic_Bitset.h
*
* $Id$
*
* @author Huang-Ming Huang <hh1@cse.wustl.edu>
*/
//=============================================================================
#ifndef DYNAMIC_BITSET_H
#define DYNAMIC_BITSET_H
#include <memory.h>
/**
*
*/
class Dynamic_Bitset
{
typedef unsigned block;
typedef unsigned size_type;
enum {
BYTES_PER_BLOCK = sizeof(block),
BITS_PER_BLOCK = sizeof(block)*8
};
public:
class reference {
public:
reference(Dynamic_Bitset* bitset, size_type bit);
reference operator = (bool val);
operator bool () const;
private:
Dynamic_Bitset* bitset_;
size_type bit_;
};
Dynamic_Bitset(size_type size=0);
~Dynamic_Bitset();
Dynamic_Bitset(const Dynamic_Bitset& other);
Dynamic_Bitset& operator = (const Dynamic_Bitset& other);
Dynamic_Bitset& operator &=(const Dynamic_Bitset& other);
reference operator[](size_type bit);
size_type size() const;
bool test(size_type bit) const;
void set(size_type bit, bool val = true);
void flip();
void resize(size_type num_bits, bool value = false);
friend bool operator == (const Dynamic_Bitset& lhs, const Dynamic_Bitset& rhs);
private:
block* buffer_;
size_type buffer_size_;
size_type bit_size_;
};
bool operator == (const Dynamic_Bitset& lhs, const Dynamic_Bitset& rhs);
inline Dynamic_Bitset operator & (const Dynamic_Bitset& lhs, const Dynamic_Bitset& rhs)
{
Dynamic_Bitset tmp(lhs);
tmp &= rhs;
return tmp;
}
inline Dynamic_Bitset::reference::reference(Dynamic_Bitset* bitset, size_type bit)
: bitset_(bitset), bit_(bit)
{
}
inline Dynamic_Bitset::reference Dynamic_Bitset::reference::operator = (bool val)
{
bitset_->set(bit_, val);
return *this;
}
inline Dynamic_Bitset::reference::operator bool () const
{
return bitset_->test(bit_);
}
inline Dynamic_Bitset::~Dynamic_Bitset()
{
delete[] buffer_;
}
inline Dynamic_Bitset::Dynamic_Bitset(const Dynamic_Bitset& other)
: buffer_(new block[other.buffer_size_])
, buffer_size_(other.buffer_size_)
, bit_size_(other.bit_size_)
{
memcpy(buffer_, other.buffer_, buffer_size_*BYTES_PER_BLOCK);
}
inline Dynamic_Bitset::size_type Dynamic_Bitset::size() const
{
return bit_size_;
}
inline Dynamic_Bitset::reference Dynamic_Bitset::operator[](size_type bit)
{
return Dynamic_Bitset::reference(this, bit);
}
#endif
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