10.22.6.2 <</2

Synopsis

+Obj << +Att

Arguments

Obj

object

Att

term

Description

Sends a message to Obj to store the value of Att in the object. A put message. Att must be an attribute that can be stored in objects of Obj's class.

A clause with <</2 as the principal functor of its head is a method definition clause. Such clauses only occur within the scope of a class definition. They are expanded at compile time.

Put methods are automatically generated for public slots.

Exceptions

instantiation_error

either argument is unbound.

domain_error

Mesg is not callable or Obj is not a valid object.

existence_error

Mesg is not a defined message for Obj.

Caveat

For reasons of efficiency, an Existence Error exception will only be raised if the code that sends the message is compiled with debugging enabled (see debug_message), or if the message is not determined at compile-time. In other circumstances, the message will simply fail.

Calls to the <</2 predicate will be compiled into more efficient code if the obj_decl module is loaded at compile time.

See Also

<-/2, >>/2, direct_message/4, message/4, store_slot/2