[% setvar title Interpolation of class method calls %]

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Interpolation of class method calls


  Maintainer: Michael G Schwern <schwern@pobox.com>
  Date: 17 Sep 2000
  Mailing List: perl6-language-objects@perl.org
  Number: 251
  Version: 1
  Status: Developing


Class method calls should interpolate in double-quoted strings, and similar locations.

    print "There are Dogs->num_dogs() species of dogs.";

would interpolate as:

    print 'There are '.Dogs->num_dogs().' species of dogs.';


With the exception of the argument about accessor methods, all the same arguments for object methods apply to class methods. Additionally, if scalars, arrays, hashes, subroutines and object methods interpolate, users may expect class methods to do so.

Class methods require the trailing parenthesis for clarity, same as variable object methods. Otherwise, class methods interpolate same as object methods as RFC 222.


The tokenizer will have to watch for /\s[a-z_]\w*->/i. A following /[A-Z_]\w*\(\)/ indicates a class method call.

Otherwise as RFC 222.


This RFC is intended to generate discussion about the need and wisdom of allowing class method interpolation in strings. Practical examples of code where this is useful as well as where this would be a hinderance are requested. It is presented seperately because I expect much more discussion than RFC 222 and wish to keep the consideration of the two seperate.


As RFC 222.


RFC 222 - Interpolation of object method calls

RFC 237 - Hashes should interpolate in double-quoted strings

Upcoming RFC on interpolation of subroutines