Страницы справочника OS X

Эта страница руководства для  версии 10.9 Mac OS X

Читать страницы руководства

PPI::Token::Prototype(3)             User Contributed Perl Documentation            PPI::Token::Prototype(3)



NAME
       PPI::Token::Prototype - A subroutine prototype descriptor

INHERITANCE
         PPI::Token::End
         isa PPI::Token
             isa PPI::Element

SYNOPSIS
         sub ($@) prototype;

DESCRIPTION
       Although it sort of looks like a list or condition, a subroutine prototype is a lot more like a
       string. Its job is to provide hints to the perl compiler on what type of arguments a particular
       subroutine expects, which the compiler uses to validate parameters at compile-time, and allows
       programmers to use the functions without explicit parameter braces.

       Due to the rise of OO Perl coding, which ignores these prototypes, they are most often used to allow
       for constant-like things, and to "extend" the language and create things that act like keywords and
       core functions.

         # Create something that acts like a constant
         sub MYCONSTANT () { 10 }

         # Create the "any" core-looking function
         sub any (&@) { ... }

         if ( any { $_->cute } @babies ) {
               ...
         }

METHODS
       This class provides one additional method beyond those defined by the PPI::Token and PPI::Element
       parent classes.

   prototype
       The "prototype" accessor returns the actual prototype pattern, stripped of braces and any whitespace
       inside the pattern.

SUPPORT
       See the support section in the main module.

AUTHOR
       Adam Kennedy <adamk@cpan.org>

COPYRIGHT
       Copyright 2001 - 2011 Adam Kennedy.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl
       itself.

       The full text of the license can be found in the LICENSE file included with this module.



perl v5.16.2                                     2011-02-25                         PPI::Token::Prototype(3)