January 2020
Intermediate to advanced
532 pages
13h 31m
English
Content preview from Hands-On Design Patterns and Best Practices with Julia
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Example 1 – Base.IteratorSize
The Julia Base library uses traits quite extensively. An example of such a trait is Base.IteratorSize. Its definition can be found using generator.jl:
abstract type IteratorSize endstruct SizeUnknown <: IteratorSize endstruct HasLength <: IteratorSize endstruct HasShape{N} <: IteratorSize endstruct IsInfinite <: IteratorSize end
This trait is slightly different from what we have learned about so far because it is not binary. The IteratorSize trait can be SizeUnknown, HasLength, HasShape{N}, or IsInfinite. The IteratorSize function is defined as follows:
""" IteratorSize(itertype::Type) -> IteratorSize"""IteratorSize(x) = IteratorSize(typeof(x))IteratorSize(::Type) = HasLength() # HasLength is the defaultIteratorSize(::Type{<:AbstractArray{<:Any,N}}) ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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