Class: Module

Inherits:
Object show all
Defined in:
lib/lab42/core/fn.rb,
lib/lab42/core/memoization.rb

Overview

module Lab42::Memoizer

Instance Method Summary collapse

Instance Method Details

#fm ⇒ Object 



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# File 'lib/lab42/core/fn.rb', line 10

def fm
  Lab42::Behavior::Proxy.new self, fm: true
end

#lazy_attr(sym, &blk) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/lab42/core/memoization.rb', line 21

def lazy_attr sym, &blk
  raise ArgumentError, 'missing initialization block' unless blk
  memo sym, &blk
end

#memo(*args, &blk) ⇒ Object 



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# File 'lib/lab42/core/memoization.rb', line 44

def memo *args, &blk
  define_method *args, &blk
  memoize args.first
end

#memoize(sym) ⇒ Object 



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# File 'lib/lab42/core/memoization.rb', line 26

def memoize sym
  orig_method = instance_method sym
  ivar_name = Lab42::Memoizer.make_ivar_name sym

  define_method sym do |*args|
    instance_variable_set ivar_name, {} unless instance_variable_defined? ivar_name
    instance_variable_get( ivar_name ).fetch! args do
      # Not cached yet, caching by means of fetch!
      orig_method.bind( self ).( *args )
    end
  end

  define_method "unmemoize_memo_#{sym}" do | *args |
    return instance_variable_set ivar_name, {} if args.empty?
    instance_variable_get( ivar_name ).delete args
  end
end