I'm just exploring some of VFP's foundation classes. I ran across this:

In app.h is this:
#DEFINE ERROR_IN_ERROR_METHOD_LOC    "Error in error handler"

As far as I can find it's only used in one place in _error class.

What's the point of defining something in an include file that only gets used once?


Assuming that they put it there so that it's available to me, how would I ever enen know that it's there? If I'm subclassing a foundation class, I'm not going to study every line of code in it to see what's available.

TIA