From 1160baa61bad605cf8a1d583e8ae356a54a942df Mon Sep 17 00:00:00 2001
From: Jaron Kent-Dobias <jaron@kent-dobias.com>
Date: Thu, 26 Jul 2018 16:18:40 -0400
Subject: many changes, including new spin spaces and groups and cleaning up
 core library code

---
 src/wolff_cgm.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/wolff_cgm.cpp')

diff --git a/src/wolff_cgm.cpp b/src/wolff_cgm.cpp
index 7613691..ec3ae36 100644
--- a/src/wolff_cgm.cpp
+++ b/src/wolff_cgm.cpp
@@ -75,7 +75,7 @@ int main(int argc, char *argv[]) {
   gsl_rng_set(r, rand_seed());
 
   // define spin-spin coupling
-  std::function <double(height_t<double>, height_t<double>)> Z = [] (height_t<double> h1, height_t<double> h2) -> double {
+  std::function <double(const height_t<double>&, const height_t<double>&)> Z = [] (const height_t<double>& h1, const height_t<double>& h2) -> double {
     return -pow(h1.x - h2.x, 2);
   };
 
-- 
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