From f3904b4e0490bdd7a1b60c16bfc86372736f6cfa Mon Sep 17 00:00:00 2001
From: Dhairya Gandhi <dhairya@juliacopmuting.com>
Date: Tue, 8 Oct 2019 17:17:36 +0530
Subject: [PATCH] add ZeroType back

---
 src/utils.jl | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/utils.jl b/src/utils.jl
index 246c30d7..a42c37d5 100644
--- a/src/utils.jl
+++ b/src/utils.jl
@@ -139,6 +139,19 @@ function throttle(f, timeout; leading=true, trailing=false)
   end
 end
 
+import Base: +, reshape, size
+
+struct ZeroType{T} <: Number
+  size::T
+end
+
++(a::Number, ::ZeroType) = a
++(::ZeroType, a::Number) = a
+size(xs::ZeroType) = xs.size
+reshape(::ZeroType, args...) = ZeroType(args)
+@adjoint reshape(xs::ZeroType, dims...) =
+  ZeroType(dims), Δ -> (ZeroType(size(xs)), map(_ -> nothing, dims)...)
+
 """
     @jit ...