pub trait UnsetBit {
// Required method
fn unset_bit(&self, idx: usize) -> Result<Self, IndexError>
where Self: Sized;
}Expand description
performing _ & !(1 << idx) with n the index
§Examples
§unset bit for big int
Don’t pay attention to my bigint implementation.
pub struct BigInt {
hwb: i64,
lwb: i64,
}
impl UnsetBit for BigInt {
fn unset_bit(&self, idx: usize) -> Result<Self,IndexError> where Self: Sized {
if idx >= 128 {
Err(IndexError)
} else if idx >= 64 {
Ok(BigInt{
hwb: self.hwb & !(1 << (idx - 64)),
lwb: self.lwb
})
} else {
Ok(BigInt{
hwb: self.hwb,
lwb: self.lwb & !(1 << (idx - 64))
})
}
}
}