Class: BoolXorInstruction

Inherits:
Instruction show all
Defined in:
lib/instructions/bool/bool_xor.rb

Overview

pops the top 2 items of the :bool stack; pushes a ValuePoint with their logical XOR onto the :bool stack

needs: 2 :bool

pushes: 1 :bool

Instance Attribute Summary

Attributes inherited from Instruction

#context

Instance Method Summary collapse

Methods inherited from Instruction

all_instructions, #go, inherited, #initialize, #needs, #pushes, to_nudgecode

Constructor Details

This class inherits a constructor from Instruction

Instance Method Details

#cleanup ⇒ Object 



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# File 'lib/instructions/bool/bool_xor.rb', line 24

def cleanup
  pushes :bool, @result
end

#derive ⇒ Object 



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# File 'lib/instructions/bool/bool_xor.rb', line 20

def derive
  @result = ValuePoint.new("bool", @arg1 != @arg2)
end

#preconditions? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/instructions/bool/bool_xor.rb', line 11

def preconditions?
  needs :bool, 2
end

#setup ⇒ Object 



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# File 'lib/instructions/bool/bool_xor.rb', line 15

def setup
  @arg1 = @context.pop_value(:bool)
  @arg2 = @context.pop_value(:bool)
end