Explicit type annotation of `MetaGraph`s

[lenianiva]

If I have a function that returns a MetaGraph is it possible to annotate the type?

e.g.

const CustomGraph = MetaGraph(Int64, SimpleDiGraph(Int64), ...)

function create_graph()::CustomGraph
    out = CustomGraph(SimpleDiGraph())
    return out
end

This schema doesn't work, and it says "no method matching ... exists"

[gdalle]

Output type annotations are seldom used in Julia, can I ask why you want to do this in the first place?

[gdalle]

Also, could you provide a complete runnable example? Here I'm not sure whether CustomGraph is meant to be a type or an object?

[lenianiva]

Output type annotations are seldom used in Julia, can I ask why you want to do this in the first place?

I want to pass values with the CustomGraph type into other functions. I'm only using the output type as an example. CustomGraph is meant to be a type.

[gdalle]

Can you give a complete code example? Usually you would rather constrain the input types of other functions for dispatch purposes.