Why Can\'t C Destructors Throw Exceptions with `std::nested_exception`?

Why Doesn't C Use std::nested_exception to Allow Throwing from Destructor?

The primary reason for not using std::nested_exception to facilitate throwing exceptions from destructors lies in the potential ambiguity when another exception is "in flight." If an exception is already active during destructor execution, it's unclear how to handle the situation. Overwriting the existing exception with the new one presents a potential solution, but the consensus within the C community favored invoking std::terminate or a custom std::terminate_handler instead.

Exploration of Nested Exceptions

Although the idea of using nested exceptions was considered, potential implementation challenges may have hindered its adoption. Specifically, concerns about potential performance impacts and increased complexity in exception handling may have played a role in the decision to maintain the current approach.

Future Developments

As of C 17, the stance on allowing exception throwing from destructors using nested exceptions remains unchanged. However, future versions of C may revisit this concept and introduce alternative solutions to address the issue of exceptions during object destruction.

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