Sha256: 2bda971614f7eee36d470947daec1515c0f909fcdaa7106936cadd45c5d69c05
Contents?: true
Size: 984 Bytes
Versions: 5
Compression:
Stored size: 984 Bytes
Contents
class Module
private
# Creates a new method wrapping the previous of
# the same name. Reference to the old method
# is passed into the new definition block
# as the first parameter.
#
# wrap_method( sym ) { |old_meth, *args|
# old_meth.call
# ...
# }
#
# Keep in mind that this can not be used to wrap methods
# that take a block.
#
def wrap_method( sym, &blk )
raise ArgumentError, "method does not exist" unless method_defined?( sym )
old = instance_method(sym)
undef_method(sym)
define_method(sym) { |*args| blk.call(old.bind(self), *args) }
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TCModule < Test::Unit::TestCase
def fixture_method; "A"; end
wrap_method( :fixture_method ) { |old| old.call + "B" }
def test_wrap_method
assert_equal( "AB", fixture_method )
end
end
=end
Version data entries
5 entries across 5 versions & 1 rubygems