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Why does C++ 5.3 and later emit errors about throw specifications on my derived virtual functions?

April 26, 2017derived emit errors functions later specifications throw virtual

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Why does C++ 5.3 and later emit errors about throw specifications on my derived virtual functions?

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A C++ rule newly enforced by the C++ compiler since version 5.3 is that a virtual function in a derived class can allow only the exceptions that are allowed by the function it overrides. The overriding function can be more restrictive, but not less restrictive.