Splat the fields?
function mutateimmutable{T<:Component}(c::T)
fields=getargs(c)
mutate!(fields)
return T(fields...)
end
On Sat, 2015-05-02 at 12:15, Marcus Appelros <[email protected]> wrote:
> One very crude way it can be done:
>
> function mutateimmutable(c::Component)
> fields=getargs(c)
> mutate!(fields)
> if length(fields)==1
> return typeof(c)(fields[1])
> elseif length(fields)==2
> return typeof(c)(fields[1],fields[2])
> #etc...
> end
> end
>
> On 2 May 2015 at 12:43, Mauro <[email protected]> wrote:
>> Maybe some pseudo code would make understanding your problem easier?
>>
>> On Sat, 2015-05-02 at 10:34, Marcus Appelros <[email protected]>
>> wrote:
>>> This is the use case: abstract Component with a getargs(c::Component) that
>>> returns an array with the fields of components, for concreteness lets say a
>>> Der type with the fields x and dy. We want to be able to fetch the fields,
>>> mutate the array (say replace all :a with :b^2) and then return a mutated
>>> immutable instance, and we want it defined generally on Component so no
>>> inner constructors. How?
>>
