when_echo_fns, when_exception_fns
when_echo_fns,
when_exception_fns — indicate the functions for echos or exceptions
on a point.
Syntax
when_echo_fns (symbol)
when_exception_fns (symbol)
Arguments
- symbol
A point name, as a symbol.
Returns
A list of expressions to be evaluated when an echo or
exception occurs on the symbol.
Example
Gamma> add_echo_function(#temp,#princ("echo\n"));
(princ "echo\n")
Gamma> add_echo_function(#temp,#temp/2);
(/ temp 2)
Gamma> when_echo_fns(#temp);
((/ temp 2) (princ "echo\n") t)
Gamma> write_point(#temp,22);
t
Gamma> next_event();
echo
(11 t t)
Gamma>
