20 General utilities library [utilities]

20.6 Optional objects [optional]

20.6.5 Class bad_­optional_­access [optional.bad.access]

class bad_optional_access : public exception { public: // see [exception] for the specification of the special member functions const char* what() const noexcept override; };
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The class bad_­optional_­access defines the type of objects thrown as exceptions to report the situation where an attempt is made to access the value of an optional object that does not contain a value.
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const char* what() const noexcept override;
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Returns: An implementation-defined ntbs.