I'm reading about smart pointers from a book and there it is specified that custom deleter is not allowed to throw. But I could not figure out the reason for this. Why they are not allowed to throw?
Why custome deleters for smart pointers are not allowed to throw exceptions?
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The deleter held by a smart pointer is expected to run when the smart pointer is destructed, which might be during the stack unwinding between a
throwand acatch.If your deleter throws in that circumstance, and it isn't caught by the smart pointer's destructor, then to avoid two exceptions being in-flight at the same time, there is a language rule to
std::terminatethe process.The specific case of
std::unique_ptrandstd::shared_ptrdo have a precondition that the deleter must never throw when they call it, under pain of undefined behaviour, but they don't require it to be markednoexcept.