module Memoize

Overview

Module to create memoized functions using macros.

How it works

Memoize.memoize get_number, NamedTuple(n: Int32), String do
  puts "Computed"
  n.to_s
end

The above usage will generate

@CACHE_get_number = {} of {Int32} => String

def _get_number(n : Int32) : String
  puts "Computed"
  n.to_s
end

def get_number(n : Int32) : String
  if @CACHE_get_number.has_key?({n})
    @CACHE_get_number[{n}]
  else
    @CACHE_get_number[{n}] = _get_number(n)
  end
end

Defined in:

Constant Summary

VERSION = "1.2.0"

Macro Summary

• memoize(method_name, param_tuple, return_type, &block)

  Like memoize_method but can be used in any scope (class, module, global).

• memoize_method(method_name, param_tuple, return_type, &block)

  Macro which creates a memoized function without any space bounds (infinitely large cache).

• memoize_only(method_name, rest_tuple, only_tuple, return_type, &block)

  Like memoize_only_method but can be used in any scope (module, class, global).

• memoize_only_method(method_name, rest_tuple, only_tuple, return_type, &block)

  Only memoizes certain parameters of a method.

Macro Detail

Memoize.memoize add_two, NamedTuple(n: Int32), Int32 do
  puts "Computed"
  n + 2
end

add_two(5) # Prints "Computed" and returns 7
add_two(5) # returns 7
add_two(5) # returns 7