add value(::Missing) & uncertainty(::Missing) (#127)

Author: Eben60

Project.toml

@@ -1,7 +1,7 @@
 name = "Measurements"
 uuid = "eff96d63-e80a-5855-80a2-b1b0885c5ab7"
 authors = ["Mosè Giordano <[email protected]>"]
-version = "2.8.0"
+version = "2.9.0"
 
 [deps]
 Calculus = "49dc2e85-a5d0-5ad3-a950-438e2897f1b9"

src/utils.jl

@@ -64,6 +64,9 @@ for (f, field) in ((:value, :val), (:uncertainty, :err))
 end
 value(a::Real) = a
 uncertainty(a::Real) = zero(a)
+value(a::Missing) = missing
+uncertainty(a::Missing) = missing
+
 
 """
     Measurements.value(x::Measurement)

test/runtests.jl

@@ -72,6 +72,9 @@ end
     for op in (+, -, *, /, ^)
         @test op(w, missing) === op(missing, w) === missing
     end
+
+    @test Measurements.value(missing) === missing
+    @test Measurements.uncertainty(missing) === missing
 end
 
 @testset "Weighted Average" begin