xeos
/
num-traits
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

All variants of dividing BigUint by BigDigit 

Allow the division to occur with either operand order and with any
combination of owned and borrowed arguments.
This commit is contained in:
Sam Cappleman-Lynes 2017-06-29 13:38:00 +01:00
parent 51408a9b3b
commit d0bfb54eee
2 changed files with 83 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
bigint/src/biguint.rs
View File

@ -503,6 +503,8 @@ impl<'a, 'b> Div<&'b BigUint> for &'a BigUint {
}
}
forward_all_scalar_binop_to_val_val!(impl Div<BigDigit> for BigUint, div);
impl Div<BigDigit> for BigUint {
type Output = BigUint;
@ -513,6 +515,20 @@ impl Div<BigDigit> for BigUint {
}
}
impl Div<BigUint> for BigDigit {
type Output = BigUint;
#[inline]
fn div(self, mut other: BigUint) -> BigUint {
other = other.normalize();
match other.data.len() {
0 => panic!(),
1 => From::from(self / other.data[0]),
_ => Zero::zero()
}
}
}
forward_all_binop_to_ref_ref!(impl Rem for BigUint, rem);
impl<'a, 'b> Rem<&'b BigUint> for &'a BigUint {
@ -525,13 +541,29 @@ impl<'a, 'b> Rem<&'b BigUint> for &'a BigUint {
}
}
forward_all_scalar_binop_to_val_val!(impl Rem<BigDigit> for BigUint, rem);
impl Rem<BigDigit> for BigUint {
type Output = BigDigit;
type Output = BigUint;
#[inline]
fn rem(self, other: BigDigit) -> BigDigit {
fn rem(self, other: BigDigit) -> BigUint {
let (_, r) = div_rem_digit(self, other);
r
From::from(r)
}
}
impl Rem<BigUint> for BigDigit {
type Output = BigUint;
#[inline]
fn rem(self, mut other: BigUint) -> BigUint {
other = other.normalize();
match other.data.len() {
0 => panic!(),
1 => From::from(self % other.data[0]),
_ => other
}
}
}

55
bigint/src/tests/biguint.rs
View File

@ -694,17 +694,17 @@ fn test_add() {
fn test_scalar_add() {
for elm in SUM_TRIPLES.iter() {
let (a_vec, b_vec, c_vec) = *elm;
let a = BigUint::from_slice(a_vec);
let b = BigUint::from_slice(b_vec);
let c = BigUint::from_slice(c_vec);
if a_vec.len() == 1 {
let a = a_vec[0];
let b = BigUint::from_slice(b_vec);
assert_op!(a + b == c);
assert_op!(b + a == c);
}
if b_vec.len() == 1 {
let a = BigUint::from_slice(a_vec);
let b = b_vec[0];
assert_op!(a + b == c);
assert_op!(b + a == c);
@ -729,24 +729,21 @@ fn test_sub() {
fn test_scalar_sub() {
for elm in SUM_TRIPLES.iter() {
let (a_vec, b_vec, c_vec) = *elm;
let a = BigUint::from_slice(a_vec);
let b = BigUint::from_slice(b_vec);
let c = BigUint::from_slice(c_vec);
if a_vec.len() == 1 {
let a = a_vec[0];
let b = BigUint::from_slice(b_vec);
let c = BigUint::from_slice(c_vec);
assert_op!(c - a == b);
}
if b_vec.len() == 1 {
let a = BigUint::from_slice(a_vec);
let b = b_vec[0];
let c = BigUint::from_slice(c_vec);
assert_op!(c - b == a);
}
if c_vec.len() == 1 {
let a = BigUint::from_slice(a_vec);
let b = BigUint::from_slice(b_vec);
let c = c_vec[0];
assert_op!(c - a == b);
assert_op!(c - b == a);
@ -792,6 +789,7 @@ const DIV_REM_QUADRUPLES: &'static [(&'static [BigDigit],
&'static [BigDigit],
&'static [BigDigit],
&'static [BigDigit])] = &[(&[1], &[2], &[], &[1]),
(&[3], &[2], &[1], &[1]),
(&[1, 1], &[2], &[M / 2 + 1], &[1]),
(&[1, 1, 1], &[2], &[M / 2 + 1, M / 2 + 1], &[1]),
(&[0, 1], &[N1], &[1], &[1]),
@ -825,17 +823,17 @@ fn test_mul() {
fn test_scalar_mul() {
for elm in MUL_TRIPLES.iter() {
let (a_vec, b_vec, c_vec) = *elm;
let a = BigUint::from_slice(a_vec);
let b = BigUint::from_slice(b_vec);
let c = BigUint::from_slice(c_vec);
if a_vec.len() == 1 {
let b = BigUint::from_slice(b_vec);
let a = a_vec[0];
assert_op!(a * b == c);
assert_op!(b * a == c);
}
if b_vec.len() == 1 {
let a = BigUint::from_slice(a_vec);
let b = b_vec[0];
assert_op!(a * b == c);
assert_op!(b * a == c);
@ -882,33 +880,52 @@ fn test_div_rem() {
fn test_scalar_div_rem() {
for elm in MUL_TRIPLES.iter() {
let (a_vec, b_vec, c_vec) = *elm;
let a = BigUint::from_slice(a_vec);
let b = BigUint::from_slice(b_vec);
let c = BigUint::from_slice(c_vec);
if a_vec.len() == 1 && a_vec[0] != 0 {
let a = a_vec[0];
let b = BigUint::from_slice(b_vec);
assert!(c.clone() / a == b);
assert!(c.clone() % a == Zero::zero());
assert_op!(c / a == b);
assert_op!(c % a == Zero::zero());
}
if b_vec.len() == 1 && b_vec[0] != 0 {
let a = BigUint::from_slice(a_vec);
let b = b_vec[0];
assert!(c.clone() / b == a);
assert!(c.clone() % b == Zero::zero());
assert_op!(c / b == a);
assert_op!(c % b == Zero::zero());
}
if c_vec.len() == 1 {
let c = c_vec[0];
if !a.is_zero() {
assert_op!(c / a == b);
assert_op!(c % a == Zero::zero());
}
if !b.is_zero() {
assert_op!(c / b == a);
assert_op!(c % b == Zero::zero());
}
}
}
for elm in DIV_REM_QUADRUPLES.iter() {
let (a_vec, b_vec, c_vec, d_vec) = *elm;
let a = BigUint::from_slice(a_vec);
let b = BigUint::from_slice(b_vec);
let c = BigUint::from_slice(c_vec);
let d = BigUint::from_slice(d_vec);
if b_vec.len() == 1 && b_vec[0] != 0 {
let b = b_vec[0];
let d = d_vec[0];
assert!(a.clone() / b == c);
assert!(a.clone() % b == d);
assert_op!(a / b == c);
assert_op!(a % b == d);
}
if a_vec.len() == 1 && !b.is_zero() {
let a = a_vec[0];
assert_op!(a / b == c);
assert_op!(a % b == d);
}
}
}