Bits Loops

Efficient iterations on bits.

@foreach_true_index bits index begin
    ...use index...
end

Iterate on all indices for which bits are true and invoke body(index) for each. This efficiently skips 64-but chunks so is reasonably efficient for sparse bit vectors. It also does this with no allocations (unlike using findall ).

@foreach_true_index_position bits index position begin
    ...use index and position...
end

Similar to @foreach_true_index but calls body with both the index of the entry and its position (the number of true values before it).