trap_error

Arguments

Returns

The result of the body, unless an error occurs during its evaluation, in which case the result of evaluating the error_body.

Description

This function traps any errors which occur while evaluating the body code. If no error occurs, then trap_error will finish without ever evaluating the error_body. If an error does occur, trap_error will evaluate the error_body code immediately and the error condition will be cleared. This is usually used to protect a running program from a piece of unpredictable code, such as an event handler. If the error is not trapped it will be propagated to the top-level error handler where it will cause the interpreter to go into an interactive debugging session.

Example

The following piece of code will run an event loop and protect against an unpredictable event.

while(t)
{
	trap_error(next_event(),print_trapped_error());
}

function print_trapped_error ()
{
	princ("Error\n", _error_stack_, "\n occurred...\n");
	princ("Clearing error condition and continuing.\n");
}
		

See Also

error, unwind_protect, try catch