File: multimethod.rb

Introduction

The Multimethod package implements dispatch of messages to multiple methods based on argument types.

Variadic methods and default values are supported.

Methods can be added and removed at run-time.

Examples

 require 'multimethod'

 class A
   multimethod %q{
   def foo(x) # matches any argument type
      "#{x.inspect}"
   end
   }

   multimethod %q{
   def foo(Fixnum x) # matches any Fixnum
      "Fixnum #{x.inspect}"
   end
   }

   multimethod %q{
   def foo(Numeric x) # matches any Numeric
      "Numeric #{x.inspect}"
   end
   }
 end

 a = A.new
 puts a.foo(:symbol) # ==> ":symbol"
 puts a.foo(45)      # ==> "Fixnum 45"
 puts a.foo(12.34)   # ==> "Numeric 12.34"

Known Issues

This library is not yet thread-safe, due to caching mechanisms used to increase performance. This will be fixed in a future release.

Home page

Multimethod Home

Credits

Multimethod was developed by:

Kurt Stephens — ruby-multimethod(at)umleta.com, sponsored by umleta.com

Contributors

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multimethod.rb