lsst.sphgeom
20.0.0-5-gfbfe500+d529cf1a41
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#include <BigInteger.h>
Public Member Functions | |
BigInteger (uint32_t *digits, unsigned capacity) | |
BigInteger & | operator= (BigInteger const &b) |
int | getSign () const |
unsigned | getSize () const |
getSize returns the number of digits in the value of this integer. | |
unsigned | getCapacity () const |
uint32_t const * | getDigits () const |
getDigits returns the underlying digit array. | |
void | setToZero () |
setToZero sets this integer to zero. | |
void | setTo (int64_t x) |
setTo sets this integer to the given signed 64 bit integer value. | |
void | setTo (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.
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inline |
This constructor creates a zero-valued integer with the given digit array.
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inline |
getCapacity
returns the number of digits in the underlying digit array.
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inline |
getSign
returns -1, 0 or 1 if this integer is negative, zero or positive.