Does C Provide a Non-Atomic Equivalent of `std::shared_ptr`?

No Atomic Version of std::shared_ptr

Question: Does a non-atomic equivalent of std::shared_ptr exist outside the standard library? Why was a non-atomic version not included in C 11?

Answer:

1. Non-Atomic Equivalent

std::shared_ptr, unlike other smart pointers in the standard library, is atomic. While there may be third-party alternatives, the standard itself does not provide a non-atomic version.

2. Exclusion from C 11

The inclusion of a non-atomic std::shared_ptr was debated at the C 11 Rapperswil meeting. Arguments against its inclusion included:

• Potential for code using the non-atomic version to be later used in threaded code, leading to undetected issues.
• The benefits of having a "universal" shared_ptr, regardless of features used.
• The minimal performance impact of atomicity, mitigated by move construction and assignment.
• The ability for users to implement their own non-atomic reference-counted smart pointers if needed.

After consideration, the LWG ultimately rejected the proposal for a non-atomic std::shared_ptr, reasoning that it lacked clear consensus and the benefits did not outweigh the drawbacks.

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