Merge pull request #1 from davidanthoff/iteratorsize2

Add iteratorsize2

Author: davidanthoff

src/IteratorTraits.jl

@@ -1,7 +1,7 @@
 __precompile__(true)
 module IteratorTraits
 
-export getiterator, isiterable
+export getiterator, isiterable, iteratorsize2
 
 isiterable(x::T) where {T} = method_exists(start, Tuple{T})
 
@@ -12,4 +12,9 @@ function getiterator(x)
     return x
 end
 
+struct HasLengthAfterStart <: Base.IteratorSize end
+
+iteratorsize2(x) = iteratorsize2(typeof(x))
+iteratorsize2(::Type{T}) where {T} = Base.iteratorsize(T)
+
 end # module

test/runtests.jl

@@ -13,4 +13,6 @@ end
 
 @test [1,2,3] == getiterator([1,2,3])
 
+@test iteratorsize2([1,2,3]) == Base.HasShape()
+
 end