Is std::make_unique a Better Choice than the `new` Operator for Initializing `std::unique_ptr`s?

std::make_unique: A Superior Alternative to the New Operator for Unique Pointers

The use of std::make_unique offers significant advantages over the new operator when initializing a std::unique_ptr. Here are the key benefits:

Reduced Risk of Memory Leaks

When using new to allocate memory, the responsibility for manually deleting the allocated object lies with the developer. Failure to do so can lead to memory leaks. std::make_unique, on the other hand, automatically manages the destruction of the allocated object, removing the risk of such leaks.

Increased Code Readability and Maintainability

std::make_unique provides a concise and self-explanatory syntax that clearly indicates the allocation of a std::unique_ptr. This enhances code readability and simplifies maintenance tasks.

Exception Safety

std::make_unique is carefully implemented to ensure exception safety. In the event of an exception being thrown during the initialization of the object, the allocated memory will be automatically deallocated. This behavior prevents memory leaks and data corruption.

Performance Considerations

While std::make_unique may not offer significant performance benefits over new in most cases, it can be advantageous when allocating large objects. make_unique directly invokes the constructor of the allocated object, eliminating the need for an additional copy operation that can occur when using new.

Usage Guidelines

However, there are certain scenarios where the use of make_unique may not be appropriate. If a custom deleter or an adoption of a raw pointer from elsewhere is required, the new operator remains the preferred choice.

In conclusion, std::make_unique offers a safe, efficient, and easy-to-use alternative to the new operator for initializing std::unique_ptr objects. Its benefits include memory leak prevention, improved code readability, exception safety, and potential performance gains in specific situations.

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