    # File lib/ffi/tools/const_generator.rb, line 38
        def initialize(prefix = nil, options = {})
          @includes = ['stdio.h', 'stddef.h']
          @constants = {}
          @prefix = prefix

          @required = options[:required]
          @options = options

          if block_given? then
            yield self
            calculate self.class.options.merge(options)
          end
        end