From 95b4257a4df36516e192d72b12da8673f6af3081 Mon Sep 17 00:00:00 2001
From: Jaron Kent-Dobias <jaron@kent-dobias.com>
Date: Mon, 30 Jul 2018 07:41:23 -0400
Subject: everything builds with new - operators defined

---
 lib/height.h |  4 ++++
 lib/potts.h  | 10 ++++++++++
 2 files changed, 14 insertions(+)

(limited to 'lib')

diff --git a/lib/height.h b/lib/height.h
index a4cbbed..d2173fe 100644
--- a/lib/height.h
+++ b/lib/height.h
@@ -44,6 +44,10 @@ struct height_t {
   inline double operator*(double a) const {
     return x * a;
   }
+
+  inline T operator-(const height_t& h) const {
+    return x - h.x;
+  }
 };
 
 template <class T>
diff --git a/lib/potts.h b/lib/potts.h
index e6ea636..771c8dc 100644
--- a/lib/potts.h
+++ b/lib/potts.h
@@ -53,6 +53,16 @@ class potts_t {
 
       return result;
     }
+
+    inline vector_t<q, int> operator-(const potts_t<q> &s) const {
+      vector_t<q, int> result;
+      result.fill(0);
+
+      result[x]++;
+      result[s.x]--;
+
+      return result;
+    }
 };
 
 template <q_t q>
-- 
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