add Base.extrema (#24)

Author: SimonDanisch

src/IntervalSets.jl

@@ -5,7 +5,7 @@ module IntervalSets
 # package code goes here
 
 using Base: @pure
-import Base: eltype, convert, show, in, length, isempty, isequal, issubset, ==, hash, union, intersect, minimum, maximum, range
+import Base: eltype, convert, show, in, length, isempty, isequal, issubset, ==, hash, union, intersect, minimum, maximum, extrema, range
 if isdefined(Main, :⊇)
     import Base: ⊇
 end

src/closed.jl

@@ -56,6 +56,7 @@ hash(I::ClosedInterval, h::UInt) = hash(I.left, hash(I.right, hash(_closed_inter
 
 minimum(I::ClosedInterval) = I.left
 maximum(I::ClosedInterval) = I.right
+extrema(I::ClosedInterval) = (minimum(I), maximum(I))
 
 function intersect(A::ClosedInterval, B::ClosedInterval)
     left = max(A.left, B.left)
@@ -105,4 +106,3 @@ end
 range{I<:Integer}(i::ClosedInterval{I}) = convert(UnitRange{I}, i)
 
 Base.promote_rule{T1,T2}(::Type{ClosedInterval{T1}}, ::Type{ClosedInterval{T2}}) = ClosedInterval{promote_type(T1, T2)}
-

test/runtests.jl

@@ -46,6 +46,7 @@ using Base.Test
 
         @test maximum(I) === 3
         @test minimum(I) === 0
+        @test extrema(I) === (0, 3)
 
         @test 2 in I
         @test 1..2 in 0.5..2.5