module Memoit

Constants

VERSION

Public Instance Methods

memoize(name) click to toggle source

Memoize the method with the given name.

@example

class Foo
  memoize def bar(value)
    expensive_calculation(value)
  end
end

Calls superclass method

# File lib/memoit.rb, line 13
def memoize(name)
  ivar_method_name = name.to_s.sub("?", "__questionmark").sub("!", "__bang")
  ivar_name = "@_memo_#{ivar_method_name}".to_sym
  mod = Module.new do
    define_method(name) do |*args, &block|
      return super(*args, &block) if block
      cache = instance_variable_get(ivar_name) || instance_variable_set(ivar_name, {})
      cache.fetch(args.hash) { |hash| cache[hash] = super(*args) }
    end
  end
  prepend mod
  name
end

memoize_class_method(name) click to toggle source

Memoize the class method with the given name.

@example

class Foo
  memoize_class_method def self.bar(value)
    expensive_calculation(value)
  end
end

# File lib/memoit.rb, line 35
def memoize_class_method(name)
  singleton_class.memoize(name)
end