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Contents
require 'y_support'
# RespondTo class for easy use of respond_to? in case statements.
#
class RespondTo
Matchers = {}
attr_reader :method
def self.create method; Matchers[ method ] ||= new method end
def initialize method; @method = method end
def === obj; obj.respond_to? method end
end
class Object
# RespondTo constructor.
#
def RespondTo method; RespondTo.create method end
end
class Symbol
# Creates a RespondTo object from the receiver symbol. Intended use for this
# is nin case statements: RespondTo has customized #=== method, that calls
# #respond_to? to determine the return value.
#
# For example, <tt>when ~:each</tt> in a case statement is valid only if the
# tested object respond_to?( :each ) returns true.
#
def ~@; RespondTo self end
end
Version data entries
5 entries across 5 versions & 1 rubygems