What happens to unique_ptr after move?

What happens to unique_ptr after move?

After move , unique_ptr s are set to nullptr .

Can we return unique_ptr?

unique_ptr does not allow copy construction, instead it supports move semantics. Yet, I can return a unique_ptr from a function and assign the returned value to a variable. The code above compiles and works as intended.

Is STD shared_ptr thread-safe?

Why? A std::shared_ptr consists of a control block and its resource. 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.

Is it a good idea to use std : : unique _ ptr?

I would also recommend against std::unique_ptr &&, because if is more typing and more mental stress than just std::unique_ptr while the meaning is the same. If you go for std::unique_ptr — which is a good thing — I suggest you to do it consistently.

Can a unique ptr be moved to a new instance?

These examples demonstrate this basic characteristic of unique_ptr: it can be moved, but not copied. “Moving” transfers ownership to a new unique_ptr and resets the old unique_ptr. The following example shows how to create unique_ptr instances and use them in a vector.

When to use unique _ ptr and make unique helper?

We recommend that you restrict an object to one owner, because multiple ownership adds complexity to the program logic. Therefore, when you need a smart pointer for a plain C++ object, use unique_ptr, and when you construct a unique_ptr, use the make_unique helper function.

How to initialize unique ptr in MyClass?

The following example shows how to initialize a unique_ptr that is a class member. class MyClass { private: // MyClass owns the unique_ptr. unique_ptr factory; public: // Initialize by using make_unique with ClassFactory default constructor.