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use BlockType;
use super::{Bits, BitsMut};
pub trait BitsMutExt: BitsMut {
fn bit_assign<T: Bits<Block = Self::Block>>(&mut self, other: T) {
assert_eq!( self.bit_len(), other.bit_len(),
"BitsMutExt::bit_assign: arguments have different lengths" );
let bit_len = self.bit_len();
let full_blocks = Self::Block::div_nbits(bit_len);
let extra_bits = Self::Block::mod_nbits(bit_len);
for i in 0 .. full_blocks {
let block = other.get_raw_block(i);
self.set_block(i, block);
}
if extra_bits > 0 {
let block = other.get_raw_block(full_blocks);
self.set_bits(bit_len - extra_bits as u64, extra_bits, block);
}
}
fn bit_and_assign<T: Bits<Block = Self::Block>>(&mut self, other: T) {
self.bit_zip_assign(other, |b1, b2| b1 & b2);
}
fn bit_or_assign<T: Bits<Block = Self::Block>>(&mut self, other: T) {
self.bit_zip_assign(other, |b1, b2| b1 | b2);
}
fn bit_xor_assign<T: Bits<Block = Self::Block>>(&mut self, other: T) {
self.bit_zip_assign(other, |b1, b2| b1 ^ b2);
}
fn bit_zip_assign<T, F>(&mut self, other: T, mut fun: F)
where T: Bits<Block = Self::Block>,
F: FnMut(Self::Block, Self::Block) -> Self::Block {
assert_eq!( self.bit_len(), other.bit_len(),
"BitsMutExt::bit_zip_assign: arguments have different lengths" );
let bit_len = self.bit_len();
let full_blocks = Self::Block::div_nbits(bit_len);
let extra_bits = Self::Block::mod_nbits(bit_len);
for i in 0 .. full_blocks {
let self_block = self.get_raw_block(i);
let other_block = other.get_raw_block(i);
let combined_block = fun(self_block, other_block);
self.set_block(i, combined_block);
}
if extra_bits > 0 {
let self_block = self.get_block(full_blocks);
let other_block = other.get_block(full_blocks);
let combined_block = fun(self_block, other_block);
self.set_bits(bit_len - extra_bits as u64, extra_bits, combined_block);
}
}
}
impl<T: BitsMut> BitsMutExt for T {}
#[cfg(test)]
mod test {
use {BitVec, BitSliceable, BitSliceableMut};
use super::*;
#[test]
fn bit_and_assign() {
let mut bv1: BitVec = bit_vec![false, false, true, true];
let bv2: BitVec = bit_vec![false, true, true, false];
bv1.bit_and_assign(&bv2);
assert_eq!( bv1, bit_vec![false, false, true, false] );
}
#[test]
#[should_panic]
fn bit_and_assign_bad_sizes() {
let mut bv1: BitVec = bit_vec![false, false, true, true, true];
let bv2: BitVec = bit_vec![false, true, true, false];
bv1.bit_and_assign(&bv2);
}
#[test]
fn bit_xor_assign_slice() {
let mut v1 = vec![0b00_0011_11u8];
let v2 = [0b0_1010_101u8];
v1.bit_slice_mut(2..6)
.bit_xor_assign(v2.bit_slice(3..7));
assert_eq!(v1, vec![0b00100111])
}
}