From 09a9f03fe3bec14f1550cb9916332c69d384eda7 Mon Sep 17 00:00:00 2001
From: pabloferz <pabloferz@yahoo.com.mx>
Date: Sat, 15 Oct 2016 14:28:10 -0500
Subject: [PATCH] Make Ref behave as a scalar wrapper for broadcast

---
 base/broadcast.jl | 5 ++++-
 test/broadcast.jl | 6 ++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/base/broadcast.jl b/base/broadcast.jl
index 917a9be9f3a5a6..e757690735f904 100644
--- a/base/broadcast.jl
+++ b/base/broadcast.jl
@@ -3,7 +3,7 @@
 module Broadcast
 
 using Base.Cartesian
-using Base: promote_eltype_op, @get!, _msk_end, unsafe_bitgetindex, linearindices, tail, OneTo, to_shape
+using Base: promote_eltype_op, @get!, _msk_end, unsafe_bitgetindex, linearindices, tail, OneTo, to_shape, RefValue
 import Base: .+, .-, .*, ./, .\, .//, .==, .<, .!=, .<=, .÷, .%, .<<, .>>, .^
 import Base: broadcast
 export broadcast!, bitbroadcast, dotview
@@ -30,6 +30,7 @@ end
 containertype(x) = containertype(typeof(x))
 containertype(::Type) = Any
 containertype{T<:Tuple}(::Type{T}) = Tuple
+containertype{T<:RefValue}(::Type{T}) = Array
 containertype{T<:AbstractArray}(::Type{T}) = Array
 containertype(ct1, ct2) = promote_containertype(containertype(ct1), containertype(ct2))
 @inline containertype(ct1, ct2, cts...) = promote_containertype(containertype(ct1), containertype(ct2, cts...))
@@ -48,6 +49,7 @@ broadcast_indices(A) = broadcast_indices(containertype(A), A)
 broadcast_indices(::Type{Any}, A) = ()
 broadcast_indices(::Type{Tuple}, A) = (OneTo(length(A)),)
 broadcast_indices(::Type{Array}, A) = indices(A)
+broadcast_indices(::Type{Array}, A::RefValue) = ()
 @inline broadcast_indices(A, B...) = broadcast_shape((), broadcast_indices(A), map(broadcast_indices, B)...)
 # shape (i.e., tuple-of-indices) inputs
 broadcast_shape(shape::Tuple) = shape
@@ -127,6 +129,7 @@ dumpbitcache(Bc::Vector{UInt64}, bind::Int, C::Vector{Bool}) =
     Base.copy_to_bitarray_chunks!(Bc, ((bind - 1) << 6) + 1, C, 1, min(bitcache_size, (length(Bc)-bind+1) << 6))
 
 @inline _broadcast_getindex(A, I) = _broadcast_getindex(containertype(A), A, I)
+@inline _broadcast_getindex(::Type{Array}, A::RefValue, I) = A[]
 @inline _broadcast_getindex(::Type{Any}, A, I) = A
 @inline _broadcast_getindex(::Any, A, I) = A[I]
 
diff --git a/test/broadcast.jl b/test/broadcast.jl
index 7dca2095bff7e2..b38909127332c2 100644
--- a/test/broadcast.jl
+++ b/test/broadcast.jl
@@ -337,3 +337,9 @@ end
 @test broadcast(+, 1.0, (0, -2.0)) == (1.0,-1.0)
 @test broadcast(+, 1.0, (0, -2.0), [1]) == [2.0, 0.0]
 @test broadcast(*, ["Hello"], ", ", ["World"], "!") == ["Hello, World!"]
+
+# Issue #18379
+@test (+).(1, Ref(2)) == fill(3)
+@test (+).(Ref(1), Ref(2)) == fill(3)
+@test (+).([[0,2], [1,3]], [1,-1]) == [[1,3], [0,2]]
+@test (+).([[0,2], [1,3]], Base.RefValue([1,-1])) == [[1,1], [2,2]]