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#ifndef IDSET_HPP
#define IDSET_HPP
#include <ostream>
#define CELL_TYPE unsigned int
#define CELL_SIZE (8 * sizeof(CELL_TYPE))
#define DIV_ROUND_UP(NUM, DEM) ((NUM + DEM - 1) / DEM)
template<typename T>
class IdSet {
public:
IdSet() : _length(0), _values(NULL) { }
IdSet(unsigned int length)
: _length(length),
_values(new CELL_TYPE[DIV_ROUND_UP(length, CELL_SIZE)]) {
for (unsigned int i = 0; i < DIV_ROUND_UP(_length, CELL_SIZE); ++i) {
_values[i] = 0;
}
}
virtual ~IdSet() {
if (_values != NULL)
delete[] _values;
}
IdSet(const IdSet& other) {
_length = other._length;
_values = new CELL_TYPE[DIV_ROUND_UP(_length, CELL_SIZE)];
for (unsigned int i = 0; i < DIV_ROUND_UP(_length, CELL_SIZE); ++i) {
_values[i] = other._values[i];
}
}
IdSet& operator=(const IdSet& other) {
if (_length != other._length) {
if (_values != NULL)
delete[] _values;
_length = other._length;
_values = new CELL_TYPE[DIV_ROUND_UP(_length, CELL_SIZE)];
}
for (unsigned int i = 0; i < DIV_ROUND_UP(_length, CELL_SIZE); ++i) {
_values[i] = other._values[i];
}
return *this;
}
void invert() {
for (unsigned int i = 0; i < DIV_ROUND_UP(_length, CELL_SIZE); ++i) {
_values[i] = ~_values[i];
}
}
bool contains(const T& obj) const {
unsigned int id = obj.id();
if (id >= _length) {
throw "Array out of bounds;";
}
unsigned int cell = id / CELL_SIZE;
unsigned int bit = id % CELL_SIZE;
return (_values[cell] & (1 << bit)) != 0;
}
void insert(const T& obj) {
unsigned int id = obj.id();
if (id >= _length) {
throw "Array out of bounds;";
}
unsigned int cell = id / CELL_SIZE;
unsigned int bit = id % CELL_SIZE;
_values[cell] |= (1 << bit);
}
void remove(const T& obj) {
unsigned int id = obj.id();
if (id >= _length) {
throw "Array out of bounds;";
}
}
void clear() {
for (unsigned int i = 0; i < DIV_ROUND_UP(_length, CELL_SIZE); ++i) {
_values[i] = 0;
}
}
void absorb(const IdSet& other) {
if (_length == other._length) {
for (unsigned int i = 0; i < DIV_ROUND_UP(_length, CELL_SIZE); ++i) {
_values[i] |= other._values[i];
}
} else {
throw "Sets of different sizes cannot be combined.";
}
}
void filter(const IdSet& other) {
if (_length == other._length) {
for (unsigned int i = 0; i < DIV_ROUND_UP(_length, CELL_SIZE); ++i) {
_values[i] &= ~(other._values[i]);
}
} else {
throw "Sets of different sizes cannot be filtered.";
}
}
bool operator==(const IdSet& other) const {
if (_length != other._length)
return false;
for (unsigned int i = 0; i < DIV_ROUND_UP(_length, CELL_SIZE); ++i) {
if (_values[i] != other._values[i])
return false;
}
return true;
}
bool operator!=(const IdSet& other) const {
return !(*this == other);
}
struct iterator {
iterator(const IdSet& set)
: set(set), index(0) {
if (set._values[0] & 1) {
return; // we have a zero
}
++(*this);
}
iterator(const IdSet& set, unsigned int index)
: set(set), index(index) { }
unsigned int operator*() const {
return index;
}
iterator& operator++() {
unsigned int cell, bit;
do {
index++;
for (;; index += CELL_SIZE) {
if (index >= set._length) {
index = set._length;
return *this;
}
cell = index / CELL_SIZE;
if (set._values[cell] != 0)
break;
}
bit = index % CELL_SIZE;
} while ((set._values[cell] & (1 << bit)) == 0);
return *this;
}
bool operator==(const iterator& other) {
return other.index == index;
}
bool operator!=(const iterator& other) {
return !(*this == other);
}
private:
const IdSet& set;
unsigned int index;
};
iterator begin() const {
return iterator(*this);
}
iterator end() const {
return iterator(*this, _length);
}
private:
unsigned int _length;
CELL_TYPE* _values;
};
template<typename T>
std::ostream& operator<<(std::ostream& cout, const IdSet<T>& set) {
cout << "{";
for (typename IdSet<T>::iterator it = set.begin();
it != set.end();
++it) {
cout << *it << ", ";
}
cout << "}";
return cout;
}
#endif
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