zeros does not allocate memory for each instance.

[GiggleLiu]

The memory is shared. Is it expected or a bug?

julia> vl = zeros(MVector{3, Float64}, 3)
3-element Array{MArray{Tuple{3},Float64,1,3},1}:
 [0.0, 0.0, 0.0]
 [0.0, 0.0, 0.0]
 [0.0, 0.0, 0.0]

julia> vl[1] .= 2
3-element MArray{Tuple{3},Float64,1,3} with indices SOneTo(3):
 v2.0l
 2.0
 2.0

julia> vl
3-element Array{MArray{Tuple{3},Float64,1,3},1}:
 [2.0, 2.0, 2.0]
 [2.0, 2.0, 2.0]
 [2.0, 2.0, 2.0]

[tkf]

Yeah, it is "expected" given how zeros work. Though I agree it's counter-intuitive.

I think this is more like a problem in Base.zeros: JuliaLang/julia#29168

[c42f]

Great, thanks for that cross-ref to the Base issue, this is definitely an issue which would need to be resolved in Base.

zeros(MVector{3, Float64}, 3) just calls the Base implementation of zeros and I don't think it would be helpful for StaticArrays to depart from how other mutable types are treated when passed to zeros.