[Greg McCoy]

Initialization in C++ is a little tricky when you're using objects as member variables.

When you declare the limitSwitch(UINT32) constructor, the compiler is trying to use the default constructor to create the di object, before it even looks at your constructor body. The DigitalInput class doesn't have a default (or zero-argument) constructor, so the compiler is giving you a list of the constructors which are available. You can tell the compiler to use another constructor by using an "initialization list."

I think what you mean to do is this:

#include "WPILib.h"

class limitSwitch
{
	DigitalInput di; // robot drive system

public:
	limitSwitch(UINT32 p) : di (p) { }
};

Hope this helps! Here are some links for more information:

• Initialization Lists in C++
• Constructor initialization lists