From 4d45ee1bb9079983284c1d4a70eda7d402f506b1 Mon Sep 17 00:00:00 2001
From: Mike J Innes <mike.j.innes@gmail.com>
Date: Sun, 30 Oct 2016 01:18:20 +0100
Subject: [PATCH] length for iterators

---
 src/data.jl | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/data.jl b/src/data.jl
index 179c91a6..87e87b94 100644
--- a/src/data.jl
+++ b/src/data.jl
@@ -9,6 +9,8 @@ import Iterators: partition
 
 export partition
 
+Base.length(l::Iterators.Partition) = length(l.xs) ÷ l.step
+
 _partition(r::UnitRange, step::Integer) = (step*(i-1)+1:step*i for i in 1:(r.stop÷step))
 _partition(xs, step) = (xs[i] for i in _partition(1:length(xs), step))