4 files changed, 6 insertions, 22 deletions
diff --git a/examples/ising_animation.cpp b/examples/ising_animation.cpp
index ab10585..7bafcf8 100644
--- a/examples/ising_animation.cpp
+++ b/examples/ising_animation.cpp
@@ -43,10 +43,6 @@ class draw_ising : public measurement<ising_t, ising_t> {
       C = 0;
     }
 
-    void plain_bond_visited(const system<ising_t, ising_t>&, v_t, const ising_t&, v_t, double dE) {}
-
-    void ghost_bond_visited(const system<ising_t, ising_t>&, v_t, const ising_t& s_old, const ising_t& s_new, double dE) {}
-
     void plain_site_transformed(const system<ising_t, ising_t>& S, v_t i, const ising_t&) {
       glColor3f(1.0, 0.0, 0.0);
       glRecti(i / S.G.L, i % S.G.L, (i / S.G.L) + 1, (i % S.G.L) + 1);
@@ -55,10 +51,6 @@ class draw_ising : public measurement<ising_t, ising_t> {
         glFlush();
       }
     }
-
-    void ghost_site_transformed(const system<ising_t, ising_t>&, const ising_t&) {}
-
-    void post_cluster(N_t, N_t, const system<ising_t, ising_t>&) {}
 };
 
 int main(int argc, char *argv[]) {
diff --git a/examples/ising_standalone.cpp b/examples/ising_standalone.cpp
index 14c39e7..40572fd 100644
--- a/examples/ising_standalone.cpp
+++ b/examples/ising_standalone.cpp
@@ -32,14 +32,8 @@ class measure_clusters : public measurement<ising_t, ising_t> {
 
     void pre_cluster(N_t, N_t, const system<ising_t, ising_t>&, v_t, const ising_t&) { C = 0; }
 
-    void plain_bond_visited(const system<ising_t, ising_t>&, v_t, const ising_t&, v_t, double) {}
-
-    void ghost_bond_visited(const system<ising_t, ising_t>&, v_t, const ising_t&, const ising_t&, double) {}
-
     void plain_site_transformed(const system<ising_t, ising_t>&, v_t, const ising_t&) { C++; }
 
-    void ghost_site_transformed(const system<ising_t, ising_t>&, const ising_t&) {}
-
     void post_cluster(N_t, N_t, const system<ising_t, ising_t>&) { Ctotal += C; }
 };
 
diff --git a/examples/simple_measurement.hpp b/examples/simple_measurement.hpp
index f98cfe6..217f4f0 100644
--- a/examples/simple_measurement.hpp
+++ b/examples/simple_measurement.hpp
@@ -68,8 +68,6 @@ class simple_measurement : public measurement<R_t, X_t> {
 #endif
     }
 
-    void ghost_site_transformed(const system<R_t, X_t>&, const R_t&) {}
-
     void post_cluster(N_t, N_t, const system<R_t, X_t>&) {
       totalE += E;
       totalM += M;
diff --git a/lib/include/wolff/measurement.hpp b/lib/include/wolff/measurement.hpp
index 59684fb..6e352a5 100644
--- a/lib/include/wolff/measurement.hpp
+++ b/lib/include/wolff/measurement.hpp
@@ -9,17 +9,17 @@ namespace wolff {
 template <class R_t, class X_t>
 class measurement {
   public:
-    virtual void pre_cluster(N_t, N_t, const system<R_t, X_t>&, v_t, const R_t&) = 0;
+    virtual void pre_cluster(N_t, N_t, const system<R_t, X_t>&, v_t, const R_t&) {};
 
-    virtual void plain_bond_visited(const system<R_t, X_t>&, v_t, const X_t&, v_t, double) = 0;
-    virtual void plain_site_transformed(const system<R_t, X_t>&, v_t, const X_t&) = 0;
+    virtual void plain_bond_visited(const system<R_t, X_t>&, v_t, const X_t&, v_t, double) {};
+    virtual void plain_site_transformed(const system<R_t, X_t>&, v_t, const X_t&) {};
 
 #ifndef WOLFF_NO_FIELD
-    virtual void ghost_bond_visited(const system<R_t, X_t>&, v_t, const X_t&, const X_t&, double) = 0;
-    virtual void ghost_site_transformed(const system<R_t, X_t>&, const R_t&) = 0;
+    virtual void ghost_bond_visited(const system<R_t, X_t>&, v_t, const X_t&, const X_t&, double) {};
+    virtual void ghost_site_transformed(const system<R_t, X_t>&, const R_t&) {};
 #endif
 
-    virtual void post_cluster(N_t, N_t, const system<R_t, X_t>&) = 0;
+    virtual void post_cluster(N_t, N_t, const system<R_t, X_t>&) {};
 };
 
 }