whence

Arguments

Returns

A list whose car is the input source, and whose cdr is an integer showing the sequential input order of the expression.

Description

This function checks the input source and sequence of any given Gamma expression. It returns this information in the form of a list. The sequence number is assigned the first time the expression is used, and does not change. The whence call itself is a Gamma expression, and thus generates a sequence number each time it is called.

This function requires Gamma to be running in debugging mode. To start debugging mode, you must include the -d option when starting Gamma.

Example

[~/w/devel/lisp]$ gamma -d
Gamma(TM) Advanced Programming Language
Copyright (C) Cogent Real-Time Systems Inc., 1996.  All rights reserved.
Version 2.4 Build 147 at Sep 13 1999 17:15:51
Gamma> c = 12;
12
Gamma> d = 14;
14
Gamma> whence(c);
("stdin" 1)
Gamma> whence(d);
("stdin" 2)
Gamma> f = 16;
16
Gamma> whence(f);
("stdin" 6)
Gamma>