Allocation during access to "typed" field of mutable struct

General Usage Performance
3

As Kristoffer said, it’s basically impossible to help here without more code. I was able to modify your provided code in order to define the struct and I observe no allocations in accessing the name field:

julia> abstract type AbstractElement end

julia> mutable struct Element{T<:AbstractElement} <: AbstractElement
           input::String
           name::UnitRange{Int64}
           attributes::Union{Nothing, Int}
           value::Union{T, Nothing}
           parent::Union{Element, Nothing}
           next::Union{Element, Nothing}
       end

julia> let e = Element{Element}("hi", 1:10, nothing, nothing, nothing, nothing)
           @btime $e.name
       end
  1.299 ns (0 allocations: 0 bytes)
1:10

I suspect the allocations are caused by something else. What could be causing those allocations though is anybody’s guess, since nobody but you knows how you defined getname, getnext, _equals, or Attribute.

2 Likes