Add support for registering of member data fields of structs

dispatchkit/register_function.hpp

@@ -8,6 +8,20 @@
 #include <boost/function.hpp>
 #include <boost/bind.hpp>
 
+namespace dispatchkit
+{
+  template<typename T, typename Class>
+    T &get_member(T Class::* m, Class *obj)
+    {
+      return obj->*m;
+    }
+
+  template<typename T, typename Class>
+    void register_member(Dispatch_Engine &s, T Class::* m, const std::string &name)
+    {
+      s.register_function(boost::function<T (Class *)>(boost::bind(&get_member<T, Class>, m, _1)), name);
+    }
+}
 
 #define BOOST_PP_ITERATION_LIMITS ( 0, 10 )
 #define BOOST_PP_FILENAME_1 "register_function.hpp"

dispatchkit/test.cpp

@@ -13,7 +13,7 @@ using namespace dispatchkit;
 struct Test
 {
   Test(const std::string &s)
-    : message(s)
+    : number(-25), message(s)
   {
     std::cout << "Test class constructed with value: " << s << std::endl;
   }
@@ -28,6 +28,8 @@ struct Test
     return message;
   }
 
+  int number;
+
   std::string message;
 };
 
@@ -114,7 +116,7 @@ int main()
   //so, we dispatch the to_string and pass its result as a param to "print"
   //In this example we don't bother with temporaries and we don't have to know
   //anything about types
-  dispatch(ss.get_function("print"),
+  dispatch(ss.get_function("print_string"),
       Param_List_Builder() << dispatch(ss.get_function("to_string"), Param_List_Builder() << addresult));
 
   // Now we are going to register a new dynamic function,
@@ -125,7 +127,7 @@ int main()
 
   // Call our newly defined dynamic function with 10 parameters, then send
   // its output to the "print" function
-  dispatch(ss.get_function("print"),
+  dispatch(ss.get_function("print_string"),
       Param_List_Builder() << dispatch(ss.get_function("concat_string"),
         Param_List_Builder() << std::string("\n\t") << std::string("The Value Was: ") 
                              << double(42.5) << std::string(".")
@@ -141,7 +143,7 @@ int main()
 
   register_function(ss, &Test::get_message, "get_message");
   register_function(ss, &Test::show_message, "show_message");
-
+  register_member(ss, &Test::number, "number");
 
   //Create a new object using the "Test" constructor, passing the param "Yo".
   //Then, add the new object to the system with the name "testobj2"
@@ -164,6 +166,14 @@ int main()
   //Update the value of the reference
   sr = "Bob Updated The message";
 
+  //Now, get a reference to the object's stored number
+  Boxed_Value numberref= dispatch(ss.get_function("number"), sos);
+
+  //Unbox it using Cast_Helper
+  int &ir = Cast_Helper<int &>()(numberref);
+
+  std::cout << "Number: " << ir << std::endl;
+
   //Now, prove that the reference was successfully acquired
   //and we are able to peek into the boxed types
   dispatch(ss.get_function("show_message"), sos);