Hi, I have a this kind of data structure :
type Ions_frag{} mz::Float64 intensity::Float64 charge::Int64 end I read in performance tips that it is better to define the type of the data structure but I cannot find the good one for my data structure. I tried : type Ions_frag{DataType} mz::Float64 intensity::Float64 charge::Int64 end but it gives this error : This may have arisen from a call to the constructor Ions_frag{DataType }(...), since type constructors fall back to convert methods. Closest candidates are: call{T}(::Type{T}, ::Any) convert{T}(::Type{T}, !Matched::T) Thank you for your comments !