std unique_ptr

• std unique_ptr function call

• use .get()

• https://stackoverflow.com/questions/27203286/how-to-call-method-of-wrapped-object-by-unique-ptr

• https://en.cppreference.com/w/cpp/memory/unique_ptr

• unique_ptr 使用方法

• https://shengyu7697.github.io/std-unique_ptr/

• pimpl unique_ptr

• https://www.fluentcpp.com/2017/09/22/make-pimpl-using-unique_ptr/