Class: MethodWhoInfo (private in Method

• Inheritance
• Description
• Related information
• Class protocol
  • instance creation
• Instance protocol
  • accessing
  • comparing
  • compatibility
  • private-accessing

Inheritance:

   Object
   |
   +--Method::MethodWhoInfo

Package:

stx:libbasic

Category:

Kernel-Methods

Owner:

Method

Author:

Claus Gittinger

Description:

In earlier times, Method>>who returned an array filled
with the method's class and selector.
This was done, since a smalltalk method cannot return multiple
values, but 2 values had to be returned from that method.
Thus, the who-interface was used as:
    info := <someMethod> who.
    class := info at:1.
    sel := info at:2.

Sure, this is ugly coding style, and the system has been changed to return
an object (an instance of MethodWhoInfo) which responds to the two
messages: #methodClass and #methodSelector.
This allows to write things much more intuitive:
    info := <someMethod> who.
    class := info methodClass.
    sel := info methodSelector.

However, to be backward compatible, the returned object still responds to
the #at: message, but only allows inices of 1 and 2 to be used.

The MethodWhoInfo class is private to Method - its not visible to other
classes.

Related information:

    Method

Class protocol:

 class: cls selector: sel

return a new MethodWhoInfo object;
this is a private interface for Method

Instance protocol:

 method

 methodClass

return the class which contains the method represented by myself

Usage example(s):

(Method compiledMethodAt:#who) who methodClass (Method::MethodWhoInfo compiledMethodAt:#methodClass) who methodClass

 methodSelector

return the selector under which the the method represented by myself
is found in the class

 = something

(comment from inherited method)
return true if the receiver and the arg have the same structure.
Notice:
This method is partially open coded (inlined) by the compiler(s)
identical objects are always considered equal.
redefining it may not work as expected.

 at: index

simulate the old behavior (when Method>>who returned an array)

 class: cls selector: sel