Class: Quarry::EnumerableHelper

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/quarry_rb/enumerable_helper.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data_set, container, klass, size, get_fn) ⇒ EnumerableHelper

Returns a new instance of EnumerableHelper.



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# File 'lib/quarry_rb/enumerable_helper.rb', line 6

def initialize(data_set, container, klass, size, get_fn)
  @size = container.send(size)
  @container = container
  @data_set = data_set
  @get_fn = get_fn
  @klass = klass
  
  # because of the way the Ruby GC works, it's easier to store
  # references to enumerated objects here than from the C++ side.
  # by keeping a reference to returned objects in this object,
  # iterated objects that shouldn't be released (e.g Examples)
  # won't be until the data set is released.
  @objects = Hash.new {|hash, index| hash[index] = @klass.new(@container.send(@get_fn, index), @data_set)}
end

Instance Attribute Details

#size ⇒ Object (readonly)

Returns the value of attribute size.



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# File 'lib/quarry_rb/enumerable_helper.rb', line 4

def size
  @size
end

Instance Method Details

#[](index) ⇒ Object 



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# File 'lib/quarry_rb/enumerable_helper.rb', line 21

def [](index)
  return nil if (index < 0) || (index >= @size)
  @objects[index]
end

#each ⇒ Object 



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# File 'lib/quarry_rb/enumerable_helper.rb', line 26

def each
  (0...@size).each do |index|
    yield @objects[index]
  end
end