class class1:
public:
...
private:
class impl; //the class that i wanna hide
std::unique_ptr<impl> impl_;
//私のdoxygenファイル:
EXTRACT_ALL = はい
EXTRACT_PRIVATE = いいえ
EXTRACT_PACKAGE = いいえ
EXTRACT_STATIC = いいえ
EXTRACT_LOCAL_CLASSES = はい
EXTRACT_LOCAL_METHODS = いいえ
HIDE_UNDOC_MEMBERS = はい
HIDE_UNDOC_CLASSES = いいえ