From 1d7ccc6b2c28a44a9405757bfc3fc0e7fd63584d Mon Sep 17 00:00:00 2001
From: fionnoh <fionnoh@gmail.com>
Date: Thu, 9 Nov 2017 19:46:57 +0000
Subject: [PATCH] Declaring virtual functions as pure virtual functions.

---
 lib/algorithms/iterative/ImplicitlyRestartedLanczos.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/algorithms/iterative/ImplicitlyRestartedLanczos.h b/lib/algorithms/iterative/ImplicitlyRestartedLanczos.h
index 7a0760c9..7b85c095 100644
--- a/lib/algorithms/iterative/ImplicitlyRestartedLanczos.h
+++ b/lib/algorithms/iterative/ImplicitlyRestartedLanczos.h
@@ -168,8 +168,8 @@ void basisDeflate(const std::vector<Field> &_v,const std::vector<RealD>& eval,co
 template<class Field> class ImplicitlyRestartedLanczosTester 
 {
  public:
-  virtual int TestConvergence(int j,RealD resid,Field &evec, RealD &eval,RealD evalMaxApprox);
-  virtual int ReconstructEval(int j,RealD resid,Field &evec, RealD &eval,RealD evalMaxApprox);
+  virtual int TestConvergence(int j,RealD resid,Field &evec, RealD &eval,RealD evalMaxApprox)=0;
+  virtual int ReconstructEval(int j,RealD resid,Field &evec, RealD &eval,RealD evalMaxApprox)=0;
 };
 
 enum IRLdiagonalisation {