1 files changed, 75 insertions, 0 deletions
diff --git a/examples/src/models/roughening/height.hpp b/examples/src/models/roughening/height.hpp
new file mode 100644
index 0000000..4023063
--- /dev/null
+++ b/examples/src/models/roughening/height.hpp
@@ -0,0 +1,75 @@
+
+#pragma once
+
+#include <cmath>
+#include <stdio.h>
+
+#include <wolff/types.h>
+
+/* The following is the minimum definition of a spin class.
+ *
+ * The class must contain an M_t and an F_t for holding the sum of an
+ * integer number of spins and a double-weighted number of spins,
+ * respectively.
+ *
+ * void init(X_t *p);
+ * void free_spin(X_t p);
+ * void free_spin(M_t p);
+ * void free_spin(F_t p);
+ * X_t copy(X_t x);
+ * void add(M_t *x1, int factor, X_t x2);
+ * void add(F_t *x1, double factor, X_t x2);
+ * M_t scalar_multiple(int factor, X_t x);
+ * F_t scalar_multiple(double factor, X_t x);
+ * double norm_squared(F_t x);
+ * void write_magnetization(M_t M, FILE *outfile);
+ *
+ */
+
+template <class T>
+struct height_t {
+  T x;
+
+  typedef T M_t;
+  typedef double F_t;
+
+  height_t() : x(0) {}
+
+  height_t(T x) : x(x) {}
+
+  inline T operator*(v_t a) const {
+    return x * a;
+  }
+
+  inline double operator*(double a) const {
+    return x * a;
+  }
+
+  inline T operator-(const height_t& h) const {
+    return x - h.x;
+  }
+};
+
+template <class T>
+inline T& operator+=(T& M, const height_t<T> &h) {
+  M += h.x;
+
+  return M;
+}
+
+template <class T>
+inline T& operator-=(T& M, const height_t<T> &h) {
+  M -= h.x;
+
+  return M;
+}
+
+double norm_squared(double h) {
+  return pow(h, 2);
+}
+
+template <class T>
+void write_magnetization(T M, FILE *outfile) {
+  fwrite(&M, sizeof(T), 1, outfile);
+}
+