Attaching simple metadata to types

[Jae-Mo_Lihm]

I want to create an object that behaves identically as some existing type (StructArrays in my case), but with some metadata.
So x::StructArrayWithMeta, that does what StructArray does, and also has a x.meta1 field.

Having a field x.data::StructArray and using x.data is one way, but I don’t want to write “.data” every time.

Is this possible?

[Jae-Mo_Lihm]

How to add metadata info to a DataFrame?

Dear all, this topic has been inactive for a few months, but I just wanted to add that I implemented a package to solve the first problem posted, namely how to add metadata information to a DataFrame. The trick is to use composition and the ReusePatterns package to automatically forward all method calls from one type to another. The relevant code is: using ReusePatterns struct DataFrameMeta <: AbstractDataFrame p::DataFrame meta::Dict{String, Any} DataFrameMeta(args...; kw...) = …

It seems this link discusses the solution to my problem .