I need to define two mutually circular types. I have read this issue , which suggests using a forward declaration. That works. However, I also need to contain the types in Dicts, which must be initialised. abstract type AbstractB end mutable struct A b::AbstractB A() = new() end mutable str…

Initialise a dict in a mutually circular type

anon94023334 June 15, 2020, 10:42pm 4

One possible workaround is to make B.a a union of A, Nothing and have the default constructor set a to nothing.

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