remove_echo_function
remove_echo_function — removes an echo function from a symbol.
Syntax
remove_echo_function (symbol, echo_fn)
Arguments
- symbol
- The point name, as a symbol, from which to remove the echo function.
- echo_fn
- The echo function body.
Returns
The echo function which was removed, or nil if no function was
removed.
Description
This function removes an echo function (Cogent DataHub echo handler)
from the symbol. The
echo_fn is compared to all of the current
echo functions for the symbol using the
comparison function eq.
Example
Gamma> add_echo_function(#temp,#princ("echo\n"));
(princ "echo\n")
Gamma> write_point(#temp,28);
t
Gamma> next_event();
echo
(t t)
Gamma> remove_echo_function(#temp,#princ("echo\n"));
(princ "echo\n")
Gamma> write_point(#temp,32);
t
Gamma> next_event();
(t)
Gamma>
