From d13b0faa7cd35414bdab8b19c3b3da26810bffd8 Mon Sep 17 00:00:00 2001
From: Simon <sdanisch@gmail.com>
Date: Thu, 15 Mar 2018 00:52:29 +0100
Subject: [PATCH] add Base.extrema (#24)

---
 src/IntervalSets.jl | 2 +-
 src/closed.jl       | 2 +-
 test/runtests.jl    | 1 +
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/IntervalSets.jl b/src/IntervalSets.jl
index 29fa3d0..82e2476 100644
--- a/src/IntervalSets.jl
+++ b/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
diff --git a/src/closed.jl b/src/closed.jl
index 85c1ef7..c34c4f8 100644
--- a/src/closed.jl
+++ b/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)}
-
diff --git a/test/runtests.jl b/test/runtests.jl
index 7d8efd5..bf94d37 100644
--- a/test/runtests.jl
+++ b/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