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Added associated constant BITS #50

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Added associated constant BITS #50

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19 changes: 19 additions & 0 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,9 @@ macro_rules! define_unsigned {
pub const MAX: Self = $name(((1 as $type) << $bits) -1 );
pub const MIN: Self = $name(0);

/// The size of this type
pub const BITS: u32 = $bits;

fn mask(self) -> Self {
$name(self.0 & ( ((1 as $type) << $bits).overflowing_sub(1).0))
}
Expand All @@ -67,6 +70,7 @@ macro_rules! define_signed {
impl $name {
pub const MAX: Self = $name(((1 as $type) << ($bits - 1)) - 1);
pub const MIN: Self = $name(-((1 as $type) << ($bits - 1)));
pub const BITS: u32 = $bits;

fn mask(self) -> Self {
if ( self.0 & (1<<($bits-1)) ) == 0 {
Expand Down Expand Up @@ -739,6 +743,21 @@ mod tests {
assert_eq!(i9::MIN, i9(-256));
}

#[test]
fn bits_value() {
assert_eq!(u1::BITS, 1);
assert_eq!(u3::BITS, 3);
assert_eq!(u62::BITS, 62);
assert_eq!(u108::BITS, 108);
assert_eq!(u127::BITS, 127);

assert_eq!(i1::BITS, 1);
assert_eq!(i3::BITS, 3);
assert_eq!(i62::BITS, 62);
assert_eq!(i108::BITS, 108);
assert_eq!(i127::BITS, 127);
}

#[test]
fn test_wrapping_add() {
assert_eq!(u1::MAX.wrapping_add(u1(1)), u1(0));
Expand Down