This is nice. This (unsafe) method could be used to implement array-like access functionality (getindex, setindex!, length, etc.) in a safe manner.
-erik > On Mar 17, 2015, at 11:25 , René Donner <[email protected]> wrote: > > I believe this might help: > https://groups.google.com/d/msg/julia-users/K1BlJW8k2o0/FRfANpsB_XIJ > > Am Dienstag, 17. März 2015 16:08:09 UTC+1 schrieb Kristoffer Carlsson: > Say I have an immutable with only one type. > > immutable Strain > exx::Float64 > eyy::Float64 > ezz::Float64 > gyz::Float64 > gxz::Float64 > gxy::Float64 > end > > Is there anyway I can reinterpret this as a Vector{Float64} in a fast way > without copying data. The memory of the Strain type should be exactly like > the vector. > > The reason I want to do this is because I want to i.e. be able to multiply a > strain and a general matrix but I also want to be able to write my own > functions for Strain. > > Naively, I tried this: > > julia> reinterpret(Vector{Float64}, strain) > ERROR: reinterpret: expected bits type as first argument > in reinterpret at base.jl:65 > > I saw this comment in one of the issues here > https://github.com/JuliaLang/julia/issues/5857: > > "ImmutableArrays has the advantage that Array(Vector4{Int}, 10) it can be > reinterpreted as a 4x10 matrix with reinterpret and reshape without memory > movement (e.g. when calling a c function on the data)." > > > Best regards, > Kristoffer Carlsson -- Erik Schnetter <[email protected]> http://www.perimeterinstitute.ca/personal/eschnetter/ My email is as private as my paper mail. I therefore support encrypting and signing email messages. Get my PGP key from https://sks-keyservers.net.
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