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Contents
module Tins
module PartialApplication
# If this module is included into a Proc (or similar object), it tampers
# with its Proc#arity method.
def self.included(modul)
modul.module_eval do
old_arity = instance_method(:arity)
define_method(:arity) do
defined?(@__arity__) or old_arity.bind(self).call
end
end
super
end
# Create a partial application of this Proc (or similar object) using
# _args_ as the already applied arguments.
def partial(*args)
if args.empty?
dup
elsif args.size > arity
raise ArgumentError, "wrong number of arguments (#{args.size} for #{arity})"
else
f = lambda { |*b| call(*(args + b)) }
f.instance_variable_set :@__arity__, arity - args.size
f
end
end
end
end
require 'tins/alias'
Version data entries
75 entries across 64 versions & 2 rubygems