Sha256: 1fe7e41face0c9eba35597019470dcda667d7a7942cf693a60e901b7d5811a32
Contents?: true
Size: 701 Bytes
Versions: 12
Compression:
Stored size: 701 Bytes
Contents
class Module
#
# Cache (memoize) the result of an instance method the first time
# it's called, storing this value in the "@__memoized_#{methodname}_cache"
# instance variable, and always return this value on subsequent calls
# (unless the returned value is nil).
#
def memoize(*methods)
# alias_method is faster than define_method + old.bind(self).call
methods.each do |meth|
alias_method "__memoized__#{meth}", meth
module_eval <<-EOF
def #{meth}(*a, &b)
# assumes the block won't change the result if the args are the same
(@__memoized_#{meth}_cache ||= {})[a] ||= __memoized__#{meth}(*a, &b)
end
EOF
end
end
end
Version data entries
12 entries across 12 versions & 1 rubygems