ruby-units.rb in ruby-units-0.3.6

- old
+ new

@@ -1,10 +1,10 @@
 require 'mathn'
 require 'rational'
 require 'date'
 require 'parsedate'
-# = Ruby Units 0.3.5
+# = Ruby Units 0.3.6
 #
 # Copyright 2006 by Kevin C. Olbrich, Ph.D.
 # 
 # See http://rubyforge.org/ruby-units/
 #
@@ -38,11 +38,11 @@
 #  end
 #  Unit.setup
 class Unit < Numeric
   require 'units'
   # pre-generate hashes from unit definitions for performance.  
-  VERSION = '0.3.5'
+  VERSION = '0.3.6'
   @@USER_DEFINITIONS = {}
   @@PREFIX_VALUES = {}
   @@PREFIX_MAP = {}
   @@UNIT_MAP = {}
   @@UNIT_VALUES = {}
@@ -686,23 +686,26 @@
     return out
   end
   
   # negates the scalar of the Unit
   def -@
+    return -@scalar if self.unitless?
     Unit.new(-@scalar,@numerator,@denominator)    
   end
   
   # returns abs of scalar, without the units
   def abs
     return @scalar.abs
   end
   
   def ceil
+    return @scalar.ceil if self.unitless?
     Unit.new(@scalar.ceil, @numerator, @denominator)    
   end
   
   def floor
+    return @scalar.floor if self.unitless?
     Unit.new(@scalar.floor, @numerator, @denominator)    
   end
 
   # if unitless, returns an int
   def to_int
@@ -716,17 +719,19 @@
   end
   alias :time :to_time
   alias :to_i :to_int
 
   def truncate
+    return @scalar.truncate if self.unitless?
     Unit.new(@scalar.truncate, @numerator, @denominator)    
   end
 
   def to_datetime
     DateTime.new(self.to('d').scalar)
   end
   
   def round
+    return @scalar.round if self.unitless?
     Unit.new(@scalar.round, @numerator, @denominator)    
   end
    
   # true if scalar is zero
   def zero?