dynamic ros message

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Hello, I search a way to dynamically create message handling. That means i want a function:

//main.h

createHandler(GENERALMSGTYPE geo_msg,std::vector(double) array){
       for(int i=0;i<array.size();i++){
           geo_msg.data[i]=array[i];
       }
}

That takes any type of message and writes serially to the data.

//int main()

vector<double> array; //Global array
array.push_back(0.1);
array.push_back(0.2);
array.push_back(0.3);
array.push_back(0.4);
array.push_back(0.5);
array.push_back(0.6);   
geometry_msgs::PoseStamped geo_msg;
createHandler(geo_msg,std::vector(double) array);

Is it possible to access the message dynamically, to be able to use a function that can get any message type?! I would like to generate code in respect to the given message type. Do you have any ideas, how to do this?