Function

objc_msgSend

Sends a message with a simple return value to an instance of a class.

Declaration

id objc_msgSend(id self, SEL op, ...);

Parameters

self

A pointer that points to the instance of the class that is to receive the message.

op

The selector of the method that handles the message.

...

A variable argument list containing the arguments to the method.

Return Value

The return value of the method.

Discussion

When it encounters a method call, the compiler generates a call to one of the functions objc_msgSend, objc_msgSend_stret, objc_msgSendSuper, or objc_msgSendSuper_stret. Messages sent to an object’s superclass (using the super keyword) are sent using objc_msgSendSuper; other messages are sent using objc_msgSend. Methods that have data structures as return values are sent using objc_msgSendSuper_stret and objc_msgSend_stret.

See Also

Sending Messages

objc_msgSend_fpret

Sends a message with a floating-point return value to an instance of a class.

objc_msgSend_stret

Sends a message with a data-structure return value to an instance of a class.

objc_msgSendSuper

Sends a message with a simple return value to the superclass of an instance of a class.

objc_msgSendSuper_stret

Sends a message with a data-structure return value to the superclass of an instance of a class.