関連ワード:  weak_ptr shared_ptr unique_ptr    weak_ptr vs shared_ptr vs unique_ptr    unique_ptr shared_ptr weak_ptr c++    smart pointers unique_ptr shared_ptr weak_ptr    difference between unique_ptr shared_ptr and weak_ptr    shared_ptr unique_ptr weak_ptr 区别    difference between shared_ptr and unique_ptr    c++ convert shared_ptr to unique_ptr  
結果 : weak_ptr shared_ptr unique_ptr