def result(_binding_or_hash=TOPLEVEL_BINDING)
      _arg = _binding_or_hash
      if _arg.is_a?(Hash)
        _b = binding()
        eval _arg.collect{|k,v| "#{k} = _arg[#{k.inspect}]; "}.join, _b
      elsif _arg.is_a?(Binding)
        _b = _arg
      elsif _arg.nil?
        _b = binding()
      else
        raise ArgumentError.new("#{self.class.name}#result(): argument should be Binding or Hash but passed #{_arg.class.name} object.")
      end
      return eval(@src, _b, (@filename || '(erubis'))
    end
def result(_binding_or_hash=TOPLEVEL_BINDING)
      _arg = _binding_or_hash
      if _arg.is_a?(Hash)
        _b = binding()
        eval _arg.collect{|k,v| "#{k} = _arg[#{k.inspect}]; "}.join, _b
      elsif _arg.is_a?(Binding)
        _b = _arg
      elsif _arg.nil?
        _b = binding()
      else
        raise ArgumentError.new("#{self.class.name}#result(): argument should be Binding or Hash but passed #{_arg.class.name} object.")
      end
      return eval(@src, _b, (@filename || '(erubis'))
    end
eval(@src) with binding object