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Add IsIterable trait #25

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merged 5 commits into from
Feb 22, 2017
Merged

Add IsIterable trait #25

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a1a73a4
Add IsIterable trait
davidanthoff Feb 22, 2017
a246032
Enable IsIterable on julia 0.5
davidanthoff Feb 22, 2017
5e082f3
Add docstring to IsIterable trait
davidanthoff Feb 22, 2017
91d0432
Add test for method_exists
davidanthoff Feb 22, 2017
fd69486
Fix IsIterable tests
davidanthoff Feb 22, 2017
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8 changes: 7 additions & 1 deletion src/base-traits.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@ using SimpleTraits
using Compat

export IsLeafType, IsBits, IsImmutable, IsContiguous, IsIndexLinear,
IsAnything, IsNothing, IsCallable
IsAnything, IsNothing, IsCallable, IsIterable

"Trait which contains all types"
@traitdef IsAnything{X}
Expand Down Expand Up @@ -57,4 +57,10 @@ end

Base.@deprecate_binding IsFastLinearIndex IsIndexLinear

"Trait of all iterable types"
@traitdef IsIterable{X}
@generated function SimpleTraits.trait{X}(::Type{IsIterable{X}})
method_exists(start, Tuple{X}) ? :(IsIterable{X}) : :(Not{IsIterable{X}})
end

end # module
5 changes: 5 additions & 0 deletions test/base-traits.jl
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Expand Up @@ -30,3 +30,8 @@ if VERSION < v"0.5.0-dev"
# this give deprecation warning in Julia 0.5
@test istrait(IsCallable{Base.AddFun})
end

@test istrait(IsIterable{Array})
@test !istrait(IsIterable{Cmd})
@test method_exists(start, Tuple{Base.UnitRange{Int}})
@test method_exists(start, Tuple{Base.UnitRange})
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Sorry, I wasn't clear at all, I meant:

@test istrait(IsIterable{Base.UnitRange{Int}})
@test istrait(IsIterable{Base.LogicalIndex})

and not testing the method_exists directly.

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Other than that, LGTM.

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The second one should also test UnitRange, not LogicalIndex, right?

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Yes. Just trying to confuse you more ;-)