23 General utilities library [utilities]

23.6 Optional objects [optional]

23.6.5 Class bad_­optional_­access [optional.bad.access]

class bad_optional_access : public exception {
public:
  bad_optional_access();
};
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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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bad_optional_access();
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Effects: Constructs an object of class bad_­optional_­access.
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Postconditions: what() returns an implementation-defined ntbs.