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doubleBitMask.I
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669 lines (615 loc) · 15.6 KB
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/**
* PANDA 3D SOFTWARE
* Copyright (c) Carnegie Mellon University. All rights reserved.
*
* All use of this software is subject to the terms of the revised BSD
* license. You should have received a copy of this license along
* with this source code in a file named "LICENSE."
*
* @file doubleBitMask.I
* @author drose
* @date 2000-06-08
*/
template<class BMType>
TypeHandle DoubleBitMask<BMType>::_type_handle;
/**
* Returns a DoubleBitMask whose bits are all on.
*/
template<class BMType>
INLINE DoubleBitMask<BMType> DoubleBitMask<BMType>::
all_on() {
DoubleBitMask<BMType> result;
result._lo = BitMaskType::all_on();
result._hi = BitMaskType::all_on();
return result;
}
/**
* Returns a DoubleBitMask whose bits are all off.
*/
template<class BMType>
INLINE DoubleBitMask<BMType> DoubleBitMask<BMType>::
all_off() {
DoubleBitMask<BMType> result;
result._lo.clear();
result._hi.clear();
return result;
}
/**
* Returns a DoubleBitMask whose lower on_bits bits are on.
*/
template<class BMType>
INLINE DoubleBitMask<BMType> DoubleBitMask<BMType>::
lower_on(int on_bits) {
if (on_bits <= 0) {
return all_off();
} else if (on_bits >= num_bits) {
return all_on();
}
DoubleBitMask<BMType> result;
if (on_bits <= half_bits) {
result._lo = BitMaskType::lower_on(on_bits);
} else {
result._lo = BitMaskType::all_on();
result._hi = BitMaskType::lower_on(on_bits - half_bits);
}
return result;
}
/**
* Returns a DoubleBitMask with only the indicated bit on.
*/
template<class BMType>
INLINE DoubleBitMask<BMType> DoubleBitMask<BMType>::
bit(int index) {
DoubleBitMask<BMType> result;
result.set_bit(index);
return result;
}
/**
* Returns a DoubleBitMask whose size bits, beginning at low_bit, are on.
*/
template<class BMType>
INLINE DoubleBitMask<BMType> DoubleBitMask<BMType>::
range(int low_bit, int size) {
DoubleBitMask<BMType> result;
result.set_range(low_bit, size);
return result;
}
/**
* Returns the number of bits available to set in the doubleBitMask.
*/
template<class BMType>
constexpr int DoubleBitMask<BMType>::
get_num_bits() const {
return num_bits;
}
/**
* Returns true if the nth bit is set, false if it is cleared. index must be
* in the range [0, num_bits).
*/
template<class BMType>
INLINE bool DoubleBitMask<BMType>::
get_bit(int index) const {
if (index < half_bits) {
return _lo.get_bit(index);
} else {
return _hi.get_bit(index - half_bits);
}
}
/**
* Sets the nth bit on. index must be in the range [0, num_bits).
*/
template<class BMType>
INLINE void DoubleBitMask<BMType>::
set_bit(int index) {
if (index < half_bits) {
_lo.set_bit(index);
} else {
_hi.set_bit(index - half_bits);
}
}
/**
* Sets the nth bit off. index must be in the range [0, num_bits).
*/
template<class BMType>
INLINE void DoubleBitMask<BMType>::
clear_bit(int index) {
if (index < half_bits) {
_lo.clear_bit(index);
} else {
_hi.clear_bit(index - half_bits);
}
}
/**
* Sets the nth bit either on or off, according to the indicated bool value.
* index must be in the range [0, num_bits).
*/
template<class BMType>
INLINE void DoubleBitMask<BMType>::
set_bit_to(int index, bool value) {
if (index < half_bits) {
_lo.set_bit_to(index, value);
} else {
_hi.set_bit_to(index - half_bits, value);
}
}
/**
* Returns true if the entire doubleBitMask is zero, false otherwise.
*/
template<class BMType>
INLINE bool DoubleBitMask<BMType>::
is_zero() const {
return (_lo.is_zero() && _hi.is_zero());
}
/**
* Returns true if the entire doubleBitMask is one, false otherwise.
*/
template<class BMType>
INLINE bool DoubleBitMask<BMType>::
is_all_on() const {
return (_lo.is_all_on() && _hi.is_all_on());
}
/**
* Returns a word that represents only the indicated range of bits within this
* DoubleBitMask, shifted to the least-significant position.
*/
template<class BMType>
INLINE typename DoubleBitMask<BMType>::WordType DoubleBitMask<BMType>::
extract(int low_bit, int size) const {
if (low_bit >= half_bits) {
return _hi.extract(low_bit - half_bits, size);
} else if (low_bit + size < half_bits) {
return _lo.extract(low_bit, size);
} else {
int hi_portion = low_bit + size - half_bits;
int lo_portion = size - hi_portion;
return (_hi.extract(0, hi_portion) << lo_portion) |
_lo.extract(low_bit, lo_portion);
}
}
/**
* Stores the indicated word into the indicated range of bits with this
* DoubleBitMask.
*/
template<class BMType>
INLINE void DoubleBitMask<BMType>::
store(WordType value, int low_bit, int size) {
if (low_bit >= half_bits) {
_hi.store(value, low_bit - half_bits, size);
} else if (low_bit + size < half_bits) {
_lo.store(value, low_bit, size);
} else {
int hi_portion = low_bit + size - half_bits;
int lo_portion = size - hi_portion;
_hi.store(value >> lo_portion, 0, hi_portion);
_lo.store(value, low_bit, lo_portion);
}
}
/**
* Returns true if any bit in the indicated range is set, false otherwise.
*/
template<class BMType>
INLINE bool DoubleBitMask<BMType>::
has_any_of(int low_bit, int size) const {
if (low_bit >= half_bits) {
return _hi.has_any_of(low_bit - half_bits, size);
} else if (low_bit + size < half_bits) {
return _lo.has_any_of(low_bit, size);
} else {
int hi_portion = low_bit + size - half_bits;
int lo_portion = size - hi_portion;
return _hi.has_any_of(0, hi_portion)
|| _lo.has_any_of(low_bit, lo_portion);
}
}
/**
* Returns true if all bits in the indicated range are set, false otherwise.
*/
template<class BMType>
INLINE bool DoubleBitMask<BMType>::
has_all_of(int low_bit, int size) const {
if (low_bit >= half_bits) {
return _hi.has_all_of(low_bit - half_bits, size);
} else if (low_bit + size < half_bits) {
return _lo.has_all_of(low_bit, size);
} else {
int hi_portion = low_bit + size - half_bits;
int lo_portion = size - hi_portion;
return _hi.has_all_of(0, hi_portion)
&& _lo.has_all_of(low_bit, lo_portion);
}
}
/**
* Sets the indicated range of bits on.
*/
template<class BMType>
INLINE void DoubleBitMask<BMType>::
set_range(int low_bit, int size) {
if (low_bit >= half_bits) {
_hi.set_range(low_bit - half_bits, size);
} else if (low_bit + size < half_bits) {
_lo.set_range(low_bit, size);
} else {
int hi_portion = low_bit + size - half_bits;
int lo_portion = size - hi_portion;
_hi.set_range(0, hi_portion);
_lo.set_range(low_bit, lo_portion);
}
}
/**
* Sets the indicated range of bits off.
*/
template<class BMType>
INLINE void DoubleBitMask<BMType>::
clear_range(int low_bit, int size) {
if (low_bit >= half_bits) {
_hi.clear_range(low_bit - half_bits, size);
} else if (low_bit + size < half_bits) {
_lo.clear_range(low_bit, size);
} else {
int hi_portion = low_bit + size - half_bits;
int lo_portion = size - hi_portion;
_hi.clear_range(0, hi_portion);
_lo.clear_range(low_bit, lo_portion);
}
}
/**
* Sets the indicated range of bits to either on or off.
*/
template<class BMType>
INLINE void DoubleBitMask<BMType>::
set_range_to(bool value, int low_bit, int size) {
if (value) {
set_range(low_bit, size);
} else {
clear_range(low_bit, size);
}
}
/**
* Returns the number of bits that are set to 1 in the mask.
*/
template<class BMType>
INLINE int DoubleBitMask<BMType>::
get_num_on_bits() const {
return _lo.get_num_on_bits() + _hi.get_num_on_bits();
}
/**
* Returns the number of bits that are set to 0 in the mask.
*/
template<class BMType>
INLINE int DoubleBitMask<BMType>::
get_num_off_bits() const {
return _lo.get_num_off_bits() + _hi.get_num_off_bits();
}
/**
* Returns the index of the lowest 1 bit in the mask. Returns -1 if there are
* no 1 bits.
*/
template<class BMType>
INLINE int DoubleBitMask<BMType>::
get_lowest_on_bit() const {
int result = _lo.get_lowest_on_bit();
if (result == -1) {
result = _hi.get_lowest_on_bit();
if (result != -1) {
result += half_bits;
}
}
return result;
}
/**
* Returns the index of the lowest 0 bit in the mask. Returns -1 if there are
* no 0 bits.
*/
template<class BMType>
INLINE int DoubleBitMask<BMType>::
get_lowest_off_bit() const {
int result = _lo.get_lowest_off_bit();
if (result == -1) {
result = _hi.get_lowest_off_bit();
if (result != -1) {
result += half_bits;
}
}
return result;
}
/**
* Returns the index of the highest 1 bit in the mask. Returns -1 if there
* are no 1 bits.
*/
template<class BMType>
INLINE int DoubleBitMask<BMType>::
get_highest_on_bit() const {
int result = _hi.get_highest_on_bit();
if (result == -1) {
result = _lo.get_highest_on_bit();
} else {
result += half_bits;
}
return result;
}
/**
* Returns the index of the highest 0 bit in the mask. Returns -1 if there
* are no 0 bits.
*/
template<class BMType>
INLINE int DoubleBitMask<BMType>::
get_highest_off_bit() const {
int result = _hi.get_highest_off_bit();
if (result == -1) {
result = _lo.get_highest_off_bit();
} else {
result += half_bits;
}
return result;
}
/**
* Returns the index of the next bit in the mask, above low_bit, whose value
* is different that the value of low_bit. Returns low_bit again if all bits
* higher than low_bit have the same value.
*
* This can be used to quickly iterate through all of the bits in the mask.
*/
template<class BMType>
INLINE int DoubleBitMask<BMType>::
get_next_higher_different_bit(int low_bit) const {
if (low_bit > half_bits) {
return _hi.get_next_higher_different_bit(low_bit - half_bits) + half_bits;
}
int result = _lo.get_next_higher_different_bit(low_bit);
if (result != low_bit) {
return result;
}
if (_lo.get_bit(low_bit)) {
result = _hi.get_lowest_off_bit();
} else {
result = _hi.get_lowest_on_bit();
}
if (result == -1) {
return low_bit;
}
return result + half_bits;
}
/**
* Inverts all the bits in the DoubleBitMask. This is equivalent to mask =
* ~mask.
*/
template<class BMType>
INLINE void DoubleBitMask<BMType>::
invert_in_place() {
_lo.invert_in_place();
_hi.invert_in_place();
}
/**
* Returns true if this DoubleBitMask has any "one" bits in common with the
* other one, false otherwise.
*
* This is equivalent to (mask & other) != 0, but may be faster. (Actually,
* it should only be faster in the BitArray case, but this method is provided
* for the benefit of generic programming algorithms).
*/
template<class BMType>
INLINE bool DoubleBitMask<BMType>::
has_bits_in_common(const DoubleBitMask<BMType> &other) const {
return _lo.has_bits_in_common(other._lo) ||
_hi.has_bits_in_common(other._hi);
}
/**
* Sets all the bits in the DoubleBitMask off.
*/
template<class BMType>
INLINE void DoubleBitMask<BMType>::
clear() {
_lo.clear();
_hi.clear();
}
/**
* Writes the DoubleBitMask out as a binary or a hex number, according to the
* number of bits.
*/
template<class BMType>
void DoubleBitMask<BMType>::
output(std::ostream &out) const {
output_hex(out);
}
/**
* Writes the DoubleBitMask out as a binary number, with spaces every four
* bits.
*/
template<class BMType>
void DoubleBitMask<BMType>::
output_binary(std::ostream &out, int spaces_every) const {
_hi.output_binary(out);
out << ' ';
_lo.output_binary(out);
}
/**
* Writes the DoubleBitMask out as a hexadecimal number, with spaces every
* four digits.
*/
template<class BMType>
void DoubleBitMask<BMType>::
output_hex(std::ostream &out, int spaces_every) const {
_hi.output_hex(out);
out << ' ';
_lo.output_hex(out);
}
/**
* Writes the DoubleBitMask out as a binary or a hex number, according to the
* number of bits.
*/
template<class BMType>
void DoubleBitMask<BMType>::
write(std::ostream &out, int indent_level) const {
indent(out, indent_level) << *this << "\n";
}
/**
*
*/
template<class BMType>
INLINE bool DoubleBitMask<BMType>::
operator == (const DoubleBitMask<BMType> &other) const {
return _lo == other._lo && _hi == other._hi;
}
/**
*
*/
template<class BMType>
INLINE bool DoubleBitMask<BMType>::
operator != (const DoubleBitMask<BMType> &other) const {
return _lo != other._lo && _hi != other._hi;
}
/**
* The ordering operator is of limited usefulness with a DoubleBitMask,
* however, it has a definition which places all unique DoubleBitMasks into a
* unique ordering. It may be useful when defining ordered STL containers of
* DoubleBitMasks, for instance; and it's required in order to export any STL
* container (ordered or unordered) of DoubleBitMask under Windows.
*/
template<class BMType>
INLINE bool DoubleBitMask<BMType>::
operator < (const DoubleBitMask<BMType> &other) const {
int cmp = _hi.compare_to(other._hi);
if (cmp != 0) {
return cmp < 0;
}
return _lo < other._lo;
}
/**
* Returns a number less than zero if this DoubleBitMask sorts before the
* indicated other DoubleBitMask, greater than zero if it sorts after, or 0 if
* they are equivalent. This is based on the same ordering defined by
* operator <.
*/
template<class BMType>
INLINE int DoubleBitMask<BMType>::
compare_to(const DoubleBitMask<BMType> &other) const {
int cmp = _hi.compare_to(other._hi);
if (cmp != 0) {
return cmp;
}
return _lo.compare_to(other._lo);
}
/**
*
*/
template<class BMType>
INLINE DoubleBitMask<BMType> DoubleBitMask<BMType>::
operator & (const DoubleBitMask<BMType> &other) const {
DoubleBitMask<BMType> result(*this);
result &= other;
return result;
}
/**
*
*/
template<class BMType>
INLINE DoubleBitMask<BMType> DoubleBitMask<BMType>::
operator | (const DoubleBitMask<BMType> &other) const {
DoubleBitMask<BMType> result(*this);
result |= other;
return result;
}
/**
*
*/
template<class BMType>
INLINE DoubleBitMask<BMType> DoubleBitMask<BMType>::
operator ^ (const DoubleBitMask<BMType> &other) const {
DoubleBitMask<BMType> result(*this);
result ^= other;
return result;
}
/**
*
*/
template<class BMType>
INLINE DoubleBitMask<BMType> DoubleBitMask<BMType>::
operator ~ () const {
DoubleBitMask<BMType> result(*this);
result.invert_in_place();
return result;
}
/**
*
*/
template<class BMType>
INLINE DoubleBitMask<BMType> DoubleBitMask<BMType>::
operator << (int shift) const {
DoubleBitMask<BMType> result(*this);
result <<= shift;
return result;
}
/**
*
*/
template<class BMType>
INLINE DoubleBitMask<BMType> DoubleBitMask<BMType>::
operator >> (int shift) const {
DoubleBitMask<BMType> result(*this);
result >>= shift;
return result;
}
/**
*
*/
template<class BMType>
INLINE void DoubleBitMask<BMType>::
operator &= (const DoubleBitMask<BMType> &other) {
_lo &= other._lo;
_hi &= other._hi;
}
/**
*
*/
template<class BMType>
INLINE void DoubleBitMask<BMType>::
operator |= (const DoubleBitMask<BMType> &other) {
_lo |= other._lo;
_hi |= other._hi;
}
/**
*
*/
template<class BMType>
INLINE void DoubleBitMask<BMType>::
operator ^= (const DoubleBitMask<BMType> &other) {
_lo ^= other._lo;
_hi ^= other._hi;
}
/**
*
*/
template<class BMType>
INLINE void DoubleBitMask<BMType>::
operator <<= (int shift) {
_hi = (_hi << shift) | ((_lo >> (half_bits - shift)) & BitMaskType::lower_on(shift));
_lo <<= shift;
}
/**
*
*/
template<class BMType>
INLINE void DoubleBitMask<BMType>::
operator >>= (int shift) {
_lo = (_lo >> shift) | ((_hi & BitMaskType::lower_on(shift)) << (half_bits - shift));
_hi >>= shift;
}
/**
* Adds the doubleBitMask to the indicated hash generator.
*/
template<class BMType>
INLINE void DoubleBitMask<BMType>::
generate_hash(ChecksumHashGenerator &hashgen) const {
_hi.generate_hash(hashgen);
_lo.generate_hash(hashgen);
}
/**
*
*/
template<class BMType>
void DoubleBitMask<BMType>::
init_type() {
std::ostringstream str;
str << "DoubleBitMask" << num_bits;
register_type(_type_handle, str.str());
}