Hey guys, I'm working on converting some existing Java Code over to C++, trying to use only built in standard libraries because the platform we are building on we won't be able to have any outside libraries, and it's been a while since I had to write "fancy" c++ code so here is probably an easy question for you.

I have a base class in Java that is a Number as a return type, each of its chidren return a different type (int, double, float etc). Also have a function that takes an object in java, and each child acts differently on it.

public abstract class Base{
 public abstract Number doSomething();
public abstract void setMe(Object blah);
public class Child1 extends Base{
public Number doSomething(){
value= new Double(somedouble);
return value;

public void setMe(Object blah){

What would be the best way to go about this? C++ doesn't have a generic like Number.. can I use a template in c++ aka template<class Number>.

Do I have to do anything special to make that work? Also this will be on a Linux system.

Edited 6 Years Ago by Izarian: added more detail

I am trying to stay away from Boost if possible, and use the built in typical standard libraries. Is there not a way to do it with templates and the like? It's been a while since I had to do any template wrangling, but I will head to boost as a last resort if I can just yank out the few headers that are needed and not have to install it onto the end system.

Oh I probably should mention, this code will get ported to Solaris 8, so trying to minimize anything that might not port well.

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