Merge pull request #13 from JuliaMath/teh/ranges2

Support conversion of AbstractInterval{<:Integer} to AbstractUnitRange

Author: timholy

src/IntervalSets.jl

@@ -27,6 +27,9 @@ function convert{I<:AbstractInterval}(::Type{I}, r::Range)
     T = eltype(I)
     I(convert(T, minimum(r)), convert(T, maximum(r)))
 end
+function convert{R<:AbstractUnitRange,I<:Integer}(::Type{R}, i::AbstractInterval{I})
+    R(minimum(i), maximum(i))
+end
 
 ordered{T}(a::T, b::T) = ifelse(a < b, (a, b), (b, a))
 ordered(a, b) = ordered(promote(a, b)...)

test/runtests.jl

@@ -10,6 +10,8 @@ using Base.Test
         @test_throws ArgumentError :a .. "b"
         I = 0..3
         @test string(I) == "0..3"
+        @test convert(UnitRange, I) === 0:3
+        @test convert(UnitRange{Int16}, I) === Int16(0):Int16(3)
         J = 3..2
         K = 5..4
         L = 3 ± 2