class RuboCop::Cop::Layout::AccessModifierIndentation

end
def smooth; end
private
class Plumbus
# good
end
def smooth; end
private
class Plumbus
# bad
@example EnforcedStyle: outdent
end
def smooth; end
private
class Plumbus
# good
end
def smooth; end
private
class Plumbus
# bad
@example EnforcedStyle: indent (default)
as the class/module keyword, depending on configuration.
Modifiers should be indented as deep as method definitions, or as deep

def autocorrect(node) 

def autocorrect(node)
  AlignmentCorrector.correct(processed_source, node, @column_delta)
end

def check_body(body, node) 

def check_body(body, node)
  return if body.nil? # Empty class etc.
  modifiers = body.each_child_node(:send).select(&:access_modifier?)
  class_column = node.source_range.column
  modifiers.each { |modifier| check_modifier(modifier, class_column) }
end

def check_modifier(send_node, class_start_col) 

def check_modifier(send_node, class_start_col)
  access_modifier_start_col = send_node.source_range.column
  offset = access_modifier_start_col - class_start_col
  @column_delta = expected_indent_offset - offset
  if @column_delta.zero?
    correct_style_detected
  else
    add_offense(send_node) do
      if offset == unexpected_indent_offset
        opposite_style_detected
      else
        unrecognized_style_detected
      end
    end
  end
end

def expected_indent_offset 

def expected_indent_offset
  style == :outdent ? 0 : configured_indentation_width
end

def message(node) 

def message(node)
  format(MSG, style: style.capitalize, node: node.loc.selector.source)
end

def on_block(node) 

def on_block(node)
  return unless node.class_constructor?
  check_body(node.body, node)
end

def on_class(node) 

def on_class(node)
  _name, _base_class, body = *node
  check_body(body, node)
end

def on_module(node) 

def on_module(node)
  _name, body = *node
  check_body(body, node)
end

def on_sclass(node) 

def on_sclass(node)
  _name, body = *node
  check_body(body, node)
end

def unexpected_indent_offset

changed.
An offset that is not expected, but correct if the configuration is 
def unexpected_indent_offset
  configured_indentation_width - expected_indent_offset
end