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Move from Nullable{T} to Union{T,Nothing} #21

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epatters opened this issue Oct 23, 2018 · 1 comment
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Move from Nullable{T} to Union{T,Nothing} #21

epatters opened this issue Oct 23, 2018 · 1 comment
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@epatters
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Since Julia v0.7, the Nullable{T} type has been moved from base Julia to an external package, in favor of writing Union{T,Nothing}.

Unfortunately, the more pleasant syntax T? for such "maybe types" has not yet arrived (see JuliaLang/julia#22682). When it does, we should migrate from Nullables to maybe types.
epatters added a commit that referenced this issue Oct 23, 2018
@epatters
REFACTOR: Drop support for Nullables in GraphML serialization (#21).
c6f1b51 
We defer handling of Nullable{T} and Union{T,Nothing} to downstream
applications.
epatters added a commit to epatters/semanticflowgraph that referenced this issue Oct 23, 2018
@epatters
REFACTOR: Deserialize semantic flow graphs using maybe types.
5293b8e 
By "maybe type" I mean Union{T,Nothing}, in contrast to Nullable{T}.

Cf. AlgebraicJulia/Catlab.jl#21
@epatters
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epatters commented Jul 31, 2019 •
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Regrettably, there seems to be no movement on the Julia side. I should probably adopt a compromise solution.

epatters added a commit that referenced this issue Aug 3, 2019
@epatters
CLEANUP: Eliminate Nullables in TikZ wiring diagrams (#21).
a289a5b
epatters added a commit that referenced this issue Aug 3, 2019
@epatters
CLEANUP: Eliminate Nullables from GraphML serialization (#21).
65d3418
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