```ruby
# Wrapper class providing extended functionality for a GType, which is normally
# just a kind of integer
class GirFFI::GType
  def initialize gtype
    @gtype = gtype
  end

  def to_i
    @gtype
  end

  def class_size
    type_query.class_size
  end

  def instance_size
    type_query.instance_size
  end

  private

  def type_query
    @type_query ||= GObject.type_query @gtype
  end
end
```

Use nested syntax to define GirFFI::GType
user
```ruby
module GirFFI
  # Wrapper class providing extended functionality for a GType, which is
  # normally just a kind of integer
  class GType
    def initialize gtype
      @gtype = gtype
    end

    def to_i
      @gtype
    end

    def class_size
      type_query.class_size
    end

    def instance_size
      type_query.instance_size
    end

    private

    def type_query
      @type_query ||= GObject.type_query @gtype
    end
  end
end
```
assistant