Class: FloatSubtractInstruction

Inherits:
Instruction show all
Defined in:
lib/instructions/float/float_subtract.rb

Overview

pops the top 2 items of the :float stack; pushes a ValuePoint with their difference onto the :float stack

note: the top item is the value subtracted from the second stack item’s value

needs: 2 :float

pushes: 1 :float

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 



22
23
24
 
# File 'lib/instructions/float/float_subtract.rb', line 22

def cleanup
  pushes :float, @result
end

#derive ⇒ Object 



19
20
21
 
# File 'lib/instructions/float/float_subtract.rb', line 19

def derive
  @result = ValuePoint.new("float", @arg1 - @arg2)
end

#preconditions? ⇒ Boolean

Returns:

  • (Boolean) 


12
13
14
 
# File 'lib/instructions/float/float_subtract.rb', line 12

def preconditions?
  needs :float, 2
end

#setup ⇒ Object 



15
16
17
18
 
# File 'lib/instructions/float/float_subtract.rb', line 15

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