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add note on eltype and getindex #39204

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add note on eltype and getindex #39204

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7215c0b
add note on eltype and getindex
kalmarek Jan 11, 2021
102df1b
eltype is just supertype of elts in iteration
kalmarek Jan 12, 2021
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4 changes: 4 additions & 0 deletions base/abstractarray.jl
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Expand Up @@ -173,6 +173,10 @@ For dictionary types, this will be a `Pair{KeyType,ValType}`. The definition
instead of types. However the form that accepts a type argument should be defined for new
types.

It is required that for iterable objects `eltype` satisfies `all(isa(eltype(itr)), itr)` and
it is also recommended for consistency that if `itr` implements `Base.getindex`
`typeof(itr[i]) <: eltype(itr)` holds for each valid index `i`.

# Examples
```jldoctest
julia> eltype(fill(1f0, (2,2)))
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