Struct num_bigint::BigInt
[−]
[src]
pub struct BigInt {
// some fields omitted
}A big signed integer type.
Methods
impl BigInt
fn new(sign: Sign, digits: Vec<BigDigit>) -> BigInt
Creates and initializes a BigInt.
The digits are in little-endian base 232.
fn from_biguint(sign: Sign, data: BigUint) -> BigInt
Creates and initializes a BigInt.
The digits are in little-endian base 232.
fn from_slice(sign: Sign, slice: &[BigDigit]) -> BigInt
Creates and initializes a BigInt.
fn from_bytes_be(sign: Sign, bytes: &[u8]) -> BigInt
Creates and initializes a BigInt.
The bytes are in big-endian byte order.
Examples
use num_bigint::{BigInt, Sign}; assert_eq!(BigInt::from_bytes_be(Sign::Plus, b"A"), BigInt::parse_bytes(b"65", 10).unwrap()); assert_eq!(BigInt::from_bytes_be(Sign::Plus, b"AA"), BigInt::parse_bytes(b"16705", 10).unwrap()); assert_eq!(BigInt::from_bytes_be(Sign::Plus, b"AB"), BigInt::parse_bytes(b"16706", 10).unwrap()); assert_eq!(BigInt::from_bytes_be(Sign::Plus, b"Hello world!"), BigInt::parse_bytes(b"22405534230753963835153736737", 10).unwrap());
fn from_bytes_le(sign: Sign, bytes: &[u8]) -> BigInt
Creates and initializes a BigInt.
The bytes are in little-endian byte order.
fn to_bytes_le(&self) -> (Sign, Vec<u8>)
Returns the sign and the byte representation of the BigInt in little-endian byte order.
Examples
use num_bigint::{ToBigInt, Sign}; let i = -1125.to_bigint().unwrap(); assert_eq!(i.to_bytes_le(), (Sign::Minus, vec![101, 4]));
fn to_bytes_be(&self) -> (Sign, Vec<u8>)
Returns the sign and the byte representation of the BigInt in big-endian byte order.
Examples
use num_bigint::{ToBigInt, Sign}; let i = -1125.to_bigint().unwrap(); assert_eq!(i.to_bytes_be(), (Sign::Minus, vec![4, 101]));
fn to_str_radix(&self, radix: u32) -> String
Returns the integer formatted as a string in the given radix.
radix must be in the range [2, 36].
Examples
use num_bigint::BigInt; let i = BigInt::parse_bytes(b"ff", 16).unwrap(); assert_eq!(i.to_str_radix(16), "ff");
fn sign(&self) -> Sign
Returns the sign of the BigInt as a Sign.
Examples
use num_bigint::{ToBigInt, Sign}; assert_eq!(ToBigInt::to_bigint(&1234).unwrap().sign(), Sign::Plus); assert_eq!(ToBigInt::to_bigint(&-4321).unwrap().sign(), Sign::Minus); assert_eq!(ToBigInt::to_bigint(&0).unwrap().sign(), Sign::NoSign);
fn parse_bytes(buf: &[u8], radix: u32) -> Option<BigInt>
Creates and initializes a BigInt.
Examples
use num_bigint::{BigInt, ToBigInt}; assert_eq!(BigInt::parse_bytes(b"1234", 10), ToBigInt::to_bigint(&1234)); assert_eq!(BigInt::parse_bytes(b"ABCD", 16), ToBigInt::to_bigint(&0xABCD)); assert_eq!(BigInt::parse_bytes(b"G", 16), None);
fn bits(&self) -> usize
Determines the fewest bits necessary to express the BigInt,
not including the sign.
fn to_biguint(&self) -> Option<BigUint>
Converts this BigInt into a BigUint, if it's not negative.