Add 'isassigned' for RefValue

JuliaLang · Jan 24, 2017 · f4d970f · f4d970f
1 parent 3b97b4f
commit f4d970f
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diff --git a/base/refpointer.jl b/base/refpointer.jl
@@ -41,6 +41,7 @@ type RefValue{T} <: Ref{T}
  RefValue(x) = new(x)
 end
 RefValue{T}(x::T) = RefValue{T}(x)
+isassigned(x::RefValue) = isdefined(x, :x)
 
 Ref(x::Ref) = x
 Ref(x::Any) = RefValue(x)

diff --git a/test/misc.jl b/test/misc.jl
@@ -611,3 +611,11 @@ end
  @test Foo_19281().f[1] == ()
  @test Foo_19281().f[2] == (1, )
 end
+
+let
+ x_notdefined = Ref{String}()
+ @test !isassigned(x_notdefined)
+
+ x_defined = Ref{String}("Test")
+ @test isassigned(x_defined)
+end