From 95538bb8c6ffc9d847b3d6dfb3c13e1dd2601ef2 Mon Sep 17 00:00:00 2001
From: Azusa Yamaguchi <ayamaguc@staffmail.ed.ac.uk>
Date: Sun, 21 Jun 2015 11:03:55 +0100
Subject: [PATCH] Abstract preconditioner

---
 lib/algorithms/Preconditioner.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 lib/algorithms/Preconditioner.h

diff --git a/lib/algorithms/Preconditioner.h b/lib/algorithms/Preconditioner.h
new file mode 100644
index 00000000..e62c3ab7
--- /dev/null
+++ b/lib/algorithms/Preconditioner.h
@@ -0,0 +1,19 @@
+#ifndef GRID_PRECONDITIONER_H
+#define GRID_PRECONDITIONER_H
+
+namespace Grid {
+
+  template<class Field> class Preconditioner :  public LinearFunction<Field> { 
+    virtual void operator()(const Field &src, Field & psi)=0;
+  };
+
+  template<class Field> class TrivialPrecon :  public Preconditioner<Field> { 
+  public:
+    void operator()(const Field &src, Field & psi){
+      psi = src;
+    }
+    TrivialPrecon(void){};
+  };
+
+}
+#endif