`std::make_unique` vs. `std::unique_ptr` with `new`: When Should You Use Which?

std::make_unique and std::unique_ptr with new: Understanding the Differences

Efficiency Considerations

The primary motivation behind std::make_unique is not related to efficiency, but rather to safety and ease of use. Let's delve into the key reasons:

• Safety for Temporaries: std::make_unique allows safe creation of temporary unique pointers. Using new directly with temporaries can lead to undefined behavior.
• Simplified Usage: std::make_unique eliminates the need for redundant type usage when combined with std::unique_ptr. Instead of writing std::unique_ptr(new T()), you can simply use std::make_unique().

Allocation Efficiency

Unlike std::make_shared, which avoids a second allocation in certain cases, std::make_unique does not offer any specific allocation efficiency benefits. However, it should be noted that C 17 is expected to introduce a rule change that improves the safety of direct construction of unique_ptrs using new.

Conclusion

std::make_unique is a valuable tool for safely and conveniently creating unique_ptrs, with its primary focus being on ease of use and safety, rather than runtime efficiency. By utilizing std::make_unique, developers can avoid explicit use of new and ensure that temporaries are handled safely.

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