From() without a new allocation

[dececx]

Do you think it would be reasonable to add something like:

func (b *BitSet) SetBitsetFrom(buf []uint64) {
  b.length = ulen(len(buf)) * 64
  b.set = buf
}

It's basically From() without a new allocation. Escape analysis seems to force a heap allocation with the current From() and I'm trying to avoid it.

[lemire]

Sounds reasonable.

[willf]

@dececx Do you want to write a PR?

[lemire]

Note that this issue is still reasonable and could be fixed rather easily.

For people reading this, the idea is that you'd avoid creating a new Bitset instance (which From does).