diff --git a/src/fixArray.hpp b/src/fixArray.hpp
new file mode 100644
index 0000000..d1516e4
--- /dev/null
+++ b/src/fixArray.hpp
@@ -0,0 +1,40 @@
+#ifndef __FIX_ARRAY_HPP
+#define __FIX_ARRAY_HPP
+
+namespace CosmoTool
+{
+
+  template <typename T, unsigned int sz> class fixArray
+  {
+  private:
+    T d[sz];
+    
+  public:
+    /*! Returns the size of the array. */
+    long size() const { return sz; }
+
+    /*! Returns a reference to element \a #n */
+    template<typename T2> T &operator[] (T2 n) {
+      return d[n];
+    }
+
+    /*! Returns a constant reference to element \a #n */
+    template<typename T2> const T &operator[] (T2 n) const {
+      return d[n];
+    }
+
+    template<typename T2> void importArray(T2 *indata) {
+      for (int i = 0; i < sz; i++)
+	d[i] = indata[i];
+    }
+
+    template<typename T2> void exportArray(T2 *outdata) {
+      for (int i = 0; i < sz; i++)
+	outdata[i] = d[i];
+    }
+
+  };
+
+};
+
+#endif