第159页 Ch5/Item23: Understand std::move and std::forward

第139页 Ch4/Item20: Use std::weak_ptr for std::shared_ptr-like pointers that can dangle

Potential use cases for std::weak_ptr include caching, observer lists, and the preventi...

第158页 Ch5/Item23: Understand std::move and std::forward

std::move doesn't move anything. std::forward doesn't forward anything. At runtime, nei...

第159页 Ch5/Item23: Understand std::move and std::forward

第162页 Ch5/Item23: Understand std::move and std::forward

Move requests on const objects are silently transformed into copy operations.

第164页 Ch5/Item24: Distinguish universal references from rvalue references

Universal references arise in two contexts. The most common is function template parame...