From 7bbfe4408ca3df3b11a06cced6d3b56ae1886953 Mon Sep 17 00:00:00 2001
From: kalmar <kalmar@amu.edu.pl>
Date: Fri, 4 Aug 2017 18:25:44 +0200
Subject: [PATCH] add scalar in-place mul!

---
 src/GroupRings.jl | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/GroupRings.jl b/src/GroupRings.jl
index 6abddd4..a9c4b9f 100644
--- a/src/GroupRings.jl
+++ b/src/GroupRings.jl
@@ -271,6 +271,11 @@ end
 
 (-)(X::GroupRingElem) = GroupRingElem(-X.coeffs, parent(X))
 
+function mul!{T<:Number}(a::T, X::GroupRingElem{T})
+   X.coeffs .*= a
+   return X
+end
+
 mul{T<:Number}(a::T, X::GroupRingElem{T}) = GroupRingElem(a*X.coeffs, parent(X))
 
 function mul{T<:Number, S<:Number}(a::T, X::GroupRingElem{S})