[julia-users] Type parameter describes number of items

[Andrew Gibb]

Is there a way to create a parameterised type where the parameter describes 
the number of items, ie
type Thing{N<:Integer}
    for i = 1:N
       a_i::Float64
   end
end

I realise one could achieve this simple example with an array, but I'm 
trying to create a type which holds scale space. My current thinking is 
this would consist of  a parameterisable number of images each with a 
parameterisable number of layers. And each image in the sequence has the 
two spatial dimensions (not the number of layers) reduced by a factor of 
two. 

I guess you cold do some tricks with array packing, but I guess I'm looking 
for something more elegant. Is there any way to use the type parameter to 
indicate a number of elements in this way?

Andy