This is a type of dispatch which is not allowed in Julia. The correct way to do it is indeed exactly the second thing you mention, but I didn’t understand this part:
Do you mean that in this case its its not inferred, so dispatch will happen at runtime? That’s not what I’m seeing. After a small fix to your fun
by changing ^
to a .^
, it looks everything is inferred hence dispatch is happening at compile time:
julia> function fun(x::AbstractGeneric{T}, z::AbstractArray{T}) where {T <: AbstractFloat}
return sum((myMethod(x) .- z).^2)
end
fun (generic function with 1 method)
julia> @code_warntype fun(MyType(1.), [1.,2,3])
Variables
#self#::Core.Compiler.Const(fun, false)
x::MyType{Float64}
z::Array{Float64,1}
Body::Float64
1 ─ %1 = Main.myMethod(x)::Float64
...