std::unique_ptr with an incomplete type won’t compile

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I’m using the pimpl-idiom with std::unique_ptr:

class window {
  window(const rectangle& rect);

private:
  class window_impl; // defined elsewhere
  std::unique_ptr<window_impl> impl_; // won't compile
};

However, I get a compile error regarding the use of an incomplete type, on line 304 in <memory>:

Invalid application of ‘sizeof‘ to an incomplete type ‘uixx::window::window_impl‘

For as far as I know, std::unique_ptr should be able to be used with an incomplete type. Is this a bug in libc++ or am I doing something wrong here?

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