Are smart pointer thread safe?

Yes, the control block is thread-safe; but no, the access to the resource is not thread-safe. That means, modifying the reference counter is an atomic operation and you have the guarantee that the resource will be deleted exactly once. These are all guarantees a std::shared_ptr gives you.

Are Unique_ptr thread safe?

3 Answers. unique_ptr is thread safe when used correctly. You broke the unwritten rule: Thou shalt never pass unique_ptr between threads by reference. The philosophy behind unique_ptr is that it has a single (unique) owner at all times.

Is Dereferencing thread safe?

2 Answers. No, it is not thread safe.

Is Weak_ptr lock thread safe?

Your usage of weak_ptr::lock() is indeed thread safe, however there is an unrelated race condition between constructing a weak pointer from a strong one and resetting that strong pointer.

Is Make_unique thread-safe?

No, it isn’t thread-safe.

Is Weak_ptr thread-safe?

Note that the control block used by std::weak_ptr and std::shared_ptr is thread-safe: different non-atomic std::weak_ptr objects can be accessed using mutable operations, such as operator= or reset , simultaneously by multiple threads, even when these instances are copies or otherwise share the same control block …

Can you delete a shared pointer?

If you’ve allocated a shared_ptr dynamically then you’re certainly allowed to delete it whenever you want.

Is STD string trivially copyable?

The diagnostic is not required, but std::atomic requires a trivially copyable type and std::string is not one.

What is the use of smart pointers in C++?

In modern C++ programming, the Standard Library includes smart pointers, which are used to help ensure that programs are free of memory and resource leaks and are exception-safe. Smart pointers are defined in the std namespace in the header file.

When to pass a raw pointer to a smart pointer?

In most cases, when you initialize a raw pointer or resource handle to point to an actual resource, pass the pointer to a smart pointer immediately. In modern C++, raw pointers are only used in small code blocks of limited scope, loops, or helper functions where performance is critical and there is no chance of confusion about ownership.

Is the control block thread safe in C++?

Yes, the control block is thread-safe; but no, the access to the resource is not thread-safe. That means, modifying the reference counter is an atomic operation and you have the guarantee that the resource will be deleted exactly once. These are all guarantees a std::shared_ptr gives you.

What is reference counted smart pointer?

Reference-counted smart pointer. Use when you want to assign one raw pointer to multiple owners, for example, when you return a copy of a pointer from a container but want to keep the original. The raw pointer is not deleted until all shared_ptr owners have gone out of scope or have otherwise given up ownership.