def c src, options = {}
      options = {
        :expand_types => true,
      }.merge options
      self.generate src, options
    end
def c src, options = {}
      options = {
        :expand_types => true,
      }.merge options
      self.generate src, options
    end
Adds a C function to the source, including performing automatic
 type conversion to arguments and the return value. The Ruby
 method name can be overridden by providing method_name. Unknown
 type conversions can be extended by using +add_type_converter+.