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Smart Pointers

All programming languages must answer:

how to allocate the resources?
how to get the read only access to the resource?
how to get the mut/write access to the resource?
how to pass or move the access of the resource?
when to give up the access to the resource?
when to release the resources?
~~
practical answer: resource ownership with lifetime

Back to Basics: Smart Pointers and RAII - Inbal Levi - CppCon 2021 hacking cpp: unique_ownership

The ownership model in C++
syntax and design of smart pointers and RAII

ownership events:

moving an object
passing an object as a function parameter
returning an object from a function

smart pointers

unique_ptr: single ownership
shared_ptr: multiple ownership
weak_ptr: non ownership

RESOURCE MANAGEMENT-RAII

Standard library classes using RAll
- std:string, std::vector - free memory on DTOR
- std::jthread - rejoin on DTOR
Standard library utilities
- std::unique_lock - exclusive mutex wrapper (C++11)
- std::shared_lock - shared mutex wrapper (C++14)
- std:lock_guard - ownership of a mutex in a scope (C++11)
- std::scoped_lock - ownership of multiple mutexes (avoids deadlock) (C++11)
- experimental:scope_exit - general purpose scope guard
Guidelines Support Library (github: Microsoft GSL)
- gsl::owner - a wrapper which prevents multiple ownership to an object

unique_ptr

hacking cpp: unique_ptr

shared_ptr

hacking cpp: shared_ownership.