See e.g. https://discourse.julialang.org/t/style-recommendation-for-enum-as-type/46078/5 and https://www.juliabloggers.com/julia-dispatching-enum-versus-type/ for a discussion.
This is helpful for e.g. dispatching on OGRFIELDTYPE in
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const _FETCHFIELD = Dict{OGRFieldType,Function}( |
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OFTInteger => asint, |
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OFTIntegerList => asintlist, |
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OFTReal => asdouble, |
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OFTRealList => asdoublelist, |
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OFTString => asstring, |
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OFTStringList => asstringlist, |
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OFTBinary => asbinary, |
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OFTDate => asdatetime, |
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OFTTime => asdatetime, |
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OFTDateTime => asdatetime, |
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OFTInteger64 => asint64, |
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OFTInteger64List => asint64list, |
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) |
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|
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function getfield(feature::Feature, i::Integer) |
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return if isfieldset(feature, i) |
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_fieldtype = gettype(getfielddefn(feature, i)) |
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_fetchfield = get(_FETCHFIELD, _fieldtype, getdefault) |
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_fetchfield(feature, i) |
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else |
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getdefault(feature, i) |
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end |
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end |
