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LSST Data Management Base Package
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BigInteger
is an arbitrary precision signed integer class.
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#include <BigInteger.h>
Public Member Functions | |
BigInteger (std::uint32_t *digits, unsigned capacity) | |
This constructor creates a zero-valued integer with the given digit array. | |
BigInteger & | operator= (BigInteger const &b) |
int | getSign () const |
getSign returns -1, 0 or 1 if this integer is negative, zero or positive. | |
unsigned | getSize () const |
getSize returns the number of digits in the value of this integer. | |
unsigned | getCapacity () const |
getCapacity returns the number of digits in the underlying digit array. | |
std::uint32_t const * | getDigits () const |
getDigits returns the underlying digit array. | |
void | setToZero () |
setToZero sets this integer to zero. | |
void | setTo (std::int64_t x) |
setTo sets this integer to the given signed 64 bit integer value. | |
void | setTo (std::uint64_t x) |
setTo sets this integer to the given unsigned 64 bit integer value. | |
void | negate () |
negate multiplies this integer by -1. | |
BigInteger & | add (BigInteger const &b) |
add adds b to this integer. | |
BigInteger & | subtract (BigInteger const &b) |
subtract subtracts b from this integer. | |
BigInteger & | multiplyPow2 (unsigned n) |
multiplyPow2 multiplies this integer by 2ⁿ. | |
BigInteger & | multiply (BigInteger const &b) |
multiply multiplies this integer by b. | |
BigInteger
is an arbitrary precision signed integer class.
It is intended to be used in applications which need relatively small integers, and only supports addition, subtraction and multiplication.
Internally, a BigInteger consists of a sign and an unsigned magnitude. The magnitude is represented by an array of 32 bit digits, stored from least to most significant. All non-zero integers have at least one digit, the most significant of which is non-zero. Zero is defined to have no digits.
Definition at line 51 of file BigInteger.h.
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This constructor creates a zero-valued integer with the given digit array.
Definition at line 55 of file BigInteger.h.
BigInteger & lsst::sphgeom::BigInteger::add | ( | BigInteger const & | b | ) |
add
adds b to this integer.
Definition at line 163 of file BigInteger.cc.
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getCapacity
returns the number of digits in the underlying digit array.
Definition at line 81 of file BigInteger.h.
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getDigits
returns the underlying digit array.
Definition at line 84 of file BigInteger.h.
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getSign
returns -1, 0 or 1 if this integer is negative, zero or positive.
Definition at line 74 of file BigInteger.h.
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getSize
returns the number of digits in the value of this integer.
Definition at line 77 of file BigInteger.h.
BigInteger & lsst::sphgeom::BigInteger::multiply | ( | BigInteger const & | b | ) |
multiply
multiplies this integer by b.
Definition at line 256 of file BigInteger.cc.
BigInteger & lsst::sphgeom::BigInteger::multiplyPow2 | ( | unsigned | n | ) |
multiplyPow2
multiplies this integer by 2ⁿ.
Definition at line 221 of file BigInteger.cc.
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negate
multiplies this integer by -1.
Definition at line 109 of file BigInteger.h.
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Definition at line 62 of file BigInteger.h.
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setTo
sets this integer to the given signed 64 bit integer value.
Definition at line 90 of file BigInteger.h.
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setTo
sets this integer to the given unsigned 64 bit integer value.
Definition at line 100 of file BigInteger.h.
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setToZero
sets this integer to zero.
Definition at line 87 of file BigInteger.h.
BigInteger & lsst::sphgeom::BigInteger::subtract | ( | BigInteger const & | b | ) |
subtract
subtracts b from this integer.
Definition at line 208 of file BigInteger.cc.