dogpuke@gmail.com wrote:

I have a class CString. I'm wondering if it's possible to make a global
function mystr_cat that does this:

CString s1 = "hello";
s1 = mystr_cat("another", "string", "here");

Thus mystr_cat needs to access the "this" part of s1. Or maybe = can be
overloaded? Or is this type of thing not allowed?

That may be possible by overloading operator=,

but it is very unintuitive. A
user of your class would normally expect operator= to completely replace
the contents of your string. Why not simply:

s1.cat("another", "string", "here");

? Then you can simply make it a member function. Or alternatively, to elide
the need for lots of overloads for different argument numbers or variable
argument lists, you could do something like:

s1.cat("another").cat("string").cat("here");

by making a function like:

CString& CString::cat(const char* arg)
{
//...append arg to your string
return *this;
}