Cached values for the XMethods exchange rate service.

Methods
Public Instance methods
get_rate()

This is the only method that a subclass of ExchangeRate needs to implement. This is a good example to follow.

# File lib/facets/more/units.rb, line 443
        def get_rate
          data[@curr]
        end
Private Instance methods
data()
# File lib/facets/more/units.rb, line 449
        def data
          @@data ||= YAML.load_file(File.join(Units::Config::DATADIR, 'xmethods', 'cached.yaml'))
        end