When is it better to use a unique smart pointer instead of shared ownership in C++?

A unique smart pointer (std::unique_ptr) is best used when an object should have only one owner, and ownership should not be shared. It provides strict control over the object's lifetime and prevents memory leaks without the overhead of reference counting.

Use unique_ptr if:

• The object should not be shared among different parts of the program.
• You want to ensure the object is destroyed immediately when the owner goes out of scope.
• High performance is required without atomic reference counting overhead.

Example:

std::unique_ptr<MyClass> ptr = std::make_unique<MyClass>();
// ptr is the sole owner of the object

Shared ownership (std::shared_ptr) should be used when multiple parts of the program need to share ownership of an object, and the object should exist as long as at least one owner exists. However, it introduces overhead for reference counting and potential cyclic references.