Dispatch for exponentiation on Float32 intervals (#482)

* Dispatch for exponentiation on Float32 intervals

* Update functions.jl

* ups

* add test

Co-authored-by: lucaferranti <[email protected]>

Author: mfherbst

src/intervals/functions.jl

@@ -9,7 +9,7 @@
 for T in (:Integer, :Float64, :BigFloat, :Interval)
     @eval ^(a::Interval{Float64}, x::$T) = atomic(Interval{Float64}, bigequiv(a)^x)
 end
-
+^(a::Interval{Float32}, x::Interval) = atomic(Interval{Float32}, bigequiv(a)^x)
 
 # Integer power:
 

test/interval_tests/numeric.jl

@@ -377,6 +377,7 @@ end
         a = Interval{Float32}(1e38)
         b = Interval{Float32}(1e2)
         @test a * b == Interval{Float32}(floatmax(Float32), Inf)
+        @test Interval(1.0f0) ^ Interval(1.0f0) == Interval(1.0f0) # test for PR #482
     end