From de6f17c0ced95a96dbd9c28b4a75578a9bcc9f63 Mon Sep 17 00:00:00 2001
From: Evangelos Voyiatzis <evoyiatzis@gmail.com>
Date: Thu, 6 Feb 2025 17:13:56 +0200
Subject: [PATCH] define extract for improper cossq

---
 src/EXTRA-MOLECULE/improper_cossq.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/EXTRA-MOLECULE/improper_cossq.h b/src/EXTRA-MOLECULE/improper_cossq.h
index cc7e94ca5c..bcc12e654f 100644
--- a/src/EXTRA-MOLECULE/improper_cossq.h
+++ b/src/EXTRA-MOLECULE/improper_cossq.h
@@ -33,6 +33,7 @@ class ImproperCossq : public Improper {
   void write_restart(FILE *) override;
   void read_restart(FILE *) override;
   void write_data(FILE *) override;
+  void *extract(const char *, int &) override;
 
  protected:
   double *k, *chi;