see https://github.com/JuliaLang/julia/issues/5857. I have been using ImmutableArrays.jl which works fine.
Am Mittwoch, 7. Mai 2014 17:12:04 UTC+2 schrieb Carlos Becker: > > Hello, I am trying to find out the best way to deal with immutables (or > types) that contain fixed-size arrays, such as this: > > # should have variable number of > > # Uint64's > > immutable Descriptor > > a1::Uint64 > > a2::Uint64 > > a3::Uint64 > > a4::Uint64 > > end > > # should work with variable-size Descriptor > > function myDist(x1::Descriptor,x2::Descriptor) :inline > > return count_ones(x1.a1 $ x2.a1) + count_ones(x1.a2 $ x2.a2) + > count_ones(x1.a3 $ x2.a3) + count_ones(x1.a4 $ x2.a4) > > end > > > > In this specific case, Descriptor is 32-bytes wide, but I would like to > make the code generic for different number of elements in the immutable. > If fixed-size arrays were available, this would be very easy, but which is > a neat way of doing this with the current julia v0.3? > > btw, the code above runs amazingly fast, using popcount instructions when > available, almost c-speed ;) > This is good news for Julia indeed. > > Thanks. >
