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All variants of subtracting BigDigit from BigUint 

Allow the subtraction 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 10:12:53 +01:00
parent 5738141b7c
commit 51408a9b3b
3 changed files with 42 additions and 12 deletions
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16
bigint/src/biguint.rs
View File

@ -439,6 +439,8 @@ impl<'a> Sub<BigUint> for &'a BigUint {
}
}
forward_all_scalar_binop_to_val_val!(impl Sub<BigDigit> for BigUint, sub);
impl Sub<BigDigit> for BigUint {
type Output = BigUint;
@ -449,6 +451,20 @@ impl Sub<BigDigit> for BigUint {
}
}
impl Sub<BigUint> for BigDigit {
type Output = BigUint;
#[inline]
fn sub(self, mut other: BigUint) -> BigUint {
if other.data.len() == 0 {
other.data.push(0);
}
sub2rev(&[self], &mut other.data[..]);
other.normalize()
}
}
forward_all_binop_to_ref_ref!(impl Mul for BigUint, mul);
impl<'a, 'b> Mul<&'b BigUint> for &'a BigUint {

26
bigint/src/macros.rs
View File

@ -118,7 +118,7 @@ macro_rules! forward_scalar_val_val_binop_commutative {
}
}
macro_rules! forward_scalar_val_ref_binop_commutative {
macro_rules! forward_scalar_val_ref_binop {
(impl $imp:ident<$scalar:ty> for $res:ty, $method:ident) => {
impl<'a> $imp<&'a $scalar> for $res {
type Output = $res;
@ -134,13 +134,13 @@ macro_rules! forward_scalar_val_ref_binop_commutative {
#[inline]
fn $method(self, other: $res) -> $res {
$imp::$method(other, *self)
$imp::$method(*self, other)
}
}
}
}
macro_rules! forward_scalar_ref_val_binop_commutative {
macro_rules! forward_scalar_ref_val_binop {
(impl $imp:ident<$scalar:ty> for $res:ty, $method:ident) => {
impl<'a> $imp<$scalar> for &'a $res {
type Output = $res;
@ -156,13 +156,13 @@ macro_rules! forward_scalar_ref_val_binop_commutative {
#[inline]
fn $method(self, other: &$res) -> $res {
$imp::$method(other.clone(), self)
$imp::$method(self, other.clone())
}
}
}
}
macro_rules! forward_scalar_ref_ref_binop_commutative {
macro_rules! forward_scalar_ref_ref_binop {
(impl $imp:ident<$scalar:ty> for $res:ty, $method:ident) => {
impl<'a, 'b> $imp<&'b $scalar> for &'a $res {
type Output = $res;
@ -178,7 +178,7 @@ macro_rules! forward_scalar_ref_ref_binop_commutative {
#[inline]
fn $method(self, other: &$res) -> $res {
$imp::$method(other.clone(), *self)
$imp::$method(*self, other.clone())
}
}
}
@ -211,11 +211,17 @@ macro_rules! forward_all_binop_to_val_ref_commutative {
};
}
macro_rules! forward_all_scalar_binop_to_val_val {
(impl $imp:ident<$scalar:ty> for $res:ty, $method:ident) => {
forward_scalar_val_ref_binop!(impl $imp<$scalar> for $res, $method);
forward_scalar_ref_val_binop!(impl $imp<$scalar> for $res, $method);
forward_scalar_ref_ref_binop!(impl $imp<$scalar> for $res, $method);
}
}
macro_rules! forward_all_scalar_binop_to_val_val_commutative {
(impl $imp:ident<$scalar:ty> for $res:ty, $method:ident) => {
forward_scalar_val_val_binop_commutative!(impl $imp<$scalar> for $res, $method);
forward_scalar_val_ref_binop_commutative!(impl $imp<$scalar> for $res, $method);
forward_scalar_ref_val_binop_commutative!(impl $imp<$scalar> for $res, $method);
forward_scalar_ref_ref_binop_commutative!(impl $imp<$scalar> for $res, $method);
forward_all_scalar_binop_to_val_val!(impl $imp<$scalar> for $res, $method);
}
}
}

12
bigint/src/tests/biguint.rs
View File

@ -734,14 +734,22 @@ fn test_scalar_sub() {
let a = a_vec[0];
let b = BigUint::from_slice(b_vec);
let c = BigUint::from_slice(c_vec);
assert!(c - a == b);
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!(c - b == a);
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);
}
}
}