Adding the CRTP interface for a two dimensional function

src/scion/math/TwoDimensionalFunctionBase.hpp

@@ -0,0 +1,41 @@
+#ifndef NJOY_SCION_MATH_TWODIMENSIONALFUNCTIONBASE
+#define NJOY_SCION_MATH_TWODIMENSIONALFUNCTIONBASE
+
+// system includes
+
+// other includes
+
+namespace njoy {
+namespace scion {
+namespace math {
+
+  /**
+   *  @class
+   *  @brief Base class for two dimensional function objects modelling y = f(x,y)
+   *
+   *  This base class provides the common interface for all two dimensional 
+   *  function objects. This includes function evaluation.
+   */
+  template < typename Derived, typename X, typename Y, typename Z >
+  class TwoDimensionalFunctionBase {
+
+  public:
+
+    /* methods */
+
+    /**
+     *  @brief Evaluate the function for a value of x and y
+     *
+     *  @param x   the value to be evaluated
+     */
+    Z operator()( const X& x, const Y& y ) const {
+
+      return static_cast< const Derived* >( this )->evaluate( x, y );
+    }
+  };
+
+} // math namespace
+} // scion namespace
+} // njoy namespace
+
+#endif