Add constructor for n-dimensional IntervalBox (#79)

* Add IntervalBox(x::Interval, n), but it's type unstable

* Use IntervalBox(x::Interval, Val{n}) to make n-dimensional box

* Add IntervalBox(x, n) as well as with Val{n}

Author: dpsanders

src/multidim/intervalbox.jl

@@ -52,3 +52,7 @@ import Base.×
 ×(a::Interval, b::IntervalBox) = IntervalBox(a, b...)
 ×(a::IntervalBox, b::Interval) = IntervalBox(a..., b)
 ×(a::IntervalBox, b::IntervalBox) = IntervalBox(a..., b...)
+
+IntervalBox{n}(x::Interval, ::Type{Val{n}}) = IntervalBox(SVector(ntuple(i->x, Val{n})))
+
+IntervalBox(x::Interval, n::Int) = IntervalBox(x, Val{n})

test/multidim_tests/multidim.jl

@@ -112,3 +112,12 @@ end
     @test Y == IntervalBox(Interval(0, 2), Interval(3, 5), Interval(4, 8))
     @test diam(Y) == 4
 end
+
+@testset "Constructing multidimensional IntervalBoxes" begin
+    @test IntervalBox(1..2, Val{1}) == IntervalBox(1..2)
+    @test IntervalBox(1..2, Val{2}) == (1..2) × (1..2)
+    @test IntervalBox(1..2, Val{5}) == (1..2) × (1..2) × (1..2) × (1..2) × (1..2)
+
+    @test IntervalBox(1..2, 3) == IntervalBox(1..2, Val{3})
+
+end