DelimitedStringFunctions.lua in C++

[Desolator]

For the sake of learning C++ I'm trying to convert DelimitedStringFunctions.lua file to C++. But I don't know how to accept any type of array (eg it doesn't matter what kind of items it has). Should I use a structure instead? I'm not too familiar with C++, but here's my current code anyway:

#include <string>

// This function will make an array into a delimited string
long funcConcatArray(long longArray, char charDelimiter)
{
	// Define the string we'll return
	std::string strReturn;

	// Get the size of the array
	unsigned long longArraySize = sizeof(longArray);

	// For each item in the array
	for (unsigned long longIndex = 1; longIndex => longArraySize; intN++) {
		// If we have reached the end of the array
		if (longIndex > longArraySize) {
			// Add the last item to the string
			strReturn += longArray[longIndex];
		// If we haven't reached the end of the string
		} else {
			// Add the item and the delimiter to the string
			strReturn += longArray[longIndex] + charDelimiter;
		}
	}

	// Return the delimited string
	return strReturn;
}