presence¶

Whether a dummy argument must be supplied.

Declaración¶

Sintaxis¶

presence = Required | Optional

Values¶

Value	Meaning
`Required`	the argument must be present at every call.
`Optional`	the `optional` attribute: the argument may be absent.

Valores devueltos¶

None. An enumeration value is not evaluated.

Descripción¶

An absent actual argument is a call_arg whose value is nil, so a call always has as many arguments as the procedure has dummies and a backend never has to match them up itself.

Ver también¶

Variable, call_arg, FunctionCall