Class: IntYankdupInstruction

Inherits:

Instruction

• Object
• Instruction
• IntYankdupInstruction

Includes:

YankdupInstruction

Defined in:

lib/instructions/int/int_yankdup.rb

Overview

pops the top item of the :int stack (the “index”); pushes a duplicate of an item from down “inside” the :int stack at its top.

If the index value is negative or 0, the bottom item on the stack is copied; if the index value is greater than or equal to the depth of the stack, the top item is copied; otherwise, the index value refers to the bottom-to-top order of stack items.

note: the destination depth is calculated after the index has been popped

needs: 2 :int

pushes: 1 :int

Instance Attribute Summary

Attributes included from YankdupInstruction

#target_stack

Attributes inherited from Instruction

#context

Instance Method Summary

• #initialize(context) ⇒ IntYankdupInstruction constructor

  A new instance of IntYankdupInstruction.

Methods included from YankdupInstruction

#cleanup, #derive, #preconditions?, #setup

Methods inherited from Instruction

all_instructions, #cleanup, #derive, #go, inherited, #needs, #preconditions?, #pushes, #setup, to_nudgecode

Constructor Details

#initialize(context) ⇒ IntYankdupInstruction

Returns a new instance of IntYankdupInstruction.

# File 'lib/instructions/int/int_yankdup.rb', line 17

def initialize(context)
  super(context, :int)
end