You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
78 lines
2.0 KiB
78 lines
2.0 KiB
#include "antlr/BitSet.h"
|
|
#include <string>
|
|
|
|
ANTLR_BEGIN_NAMESPACE(antlr)
|
|
|
|
/** A BitSet to replace java.util.BitSet.
|
|
* Primary differences are that most set operators return new sets
|
|
* as opposed to oring and anding "in place". Further, a number of
|
|
* operations were added. I cannot contain a BitSet because there
|
|
* is no way to access the internal bits (which I need for speed)
|
|
* and, because it is final, I cannot subclass to add functionality.
|
|
* Consider defining set degree. Without access to the bits, I must
|
|
* call a method n times to test the ith bit...ack!
|
|
*
|
|
* Also seems like or() from util is wrong when size of incoming set is bigger
|
|
* than this.length.
|
|
*
|
|
* This is a C++ version of the Java class described above, with only
|
|
* a handful of the methods implemented, because we don't need the
|
|
* others at runtime. It's really just a wrapper around vector<bool>,
|
|
* which should probably be changed to a wrapper around bitset, once
|
|
* bitset is more widely available.
|
|
*
|
|
* @author Terence Parr, MageLang Institute
|
|
* @author <br><a href="mailto:pete@yamuna.demon.co.uk">Pete Wells</a>
|
|
*/
|
|
BitSet::BitSet(int nbits)
|
|
: storage(nbits)
|
|
{
|
|
for (int i=0;i<nbits;i++) {
|
|
storage[i] = false;
|
|
}
|
|
}
|
|
|
|
BitSet::BitSet(const unsigned long* bits_,int nlongs)
|
|
: storage(nlongs*32)
|
|
{
|
|
for ( int i = 0 ; i < nlongs*32; i++) {
|
|
storage[i] = (bits_[i>>5] & (1UL << (i&31))) ? true : false;
|
|
}
|
|
}
|
|
|
|
BitSet::~BitSet()
|
|
{
|
|
}
|
|
|
|
void BitSet::add(int el)
|
|
{
|
|
if ( el < 0 )
|
|
throw ANTLR_USE_NAMESPACE(std)out_of_range(ANTLR_USE_NAMESPACE(std)string("antlr::BitSet.cpp line 49"));
|
|
|
|
if( static_cast<unsigned int>(el) >= storage.size() )
|
|
storage.resize( el+1, false );
|
|
|
|
storage[el] = true;
|
|
}
|
|
|
|
bool BitSet::member(int el) const
|
|
{
|
|
if ( el < 0 || static_cast<unsigned int>(el) >= storage.size())
|
|
return false;
|
|
|
|
return storage[el];
|
|
}
|
|
|
|
ANTLR_USE_NAMESPACE(std)vector<int> BitSet::toArray() const
|
|
{
|
|
ANTLR_USE_NAMESPACE(std)vector<int> elems;
|
|
for (unsigned int i=0;i<storage.size();i++) {
|
|
if (storage[i])
|
|
elems.push_back(i);
|
|
}
|
|
|
|
return elems;
|
|
}
|
|
|
|
ANTLR_END_NAMESPACE
|