Allocation when assigning to a slice

General Usage
3

It’s totally necessary, because:

z[56:end] .-= 1

is equivalent to

z[56:end] .= z[56:end] .- 1

and the slice z[56:end] on the right-hand side allocates a copy.

I also find it a lot clearer in most cases to just put @views on the whole function rather than on individual lines.

@views function test4(z)
    z[56:end] .-= 1
end

giving

julia> @btime test4($z);
  1.681 μs (0 allocations: 0 bytes)
3 Likes