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Showing content from https://timsong-cpp.github.io/cppwp/n4659/optional.bad.access below:

[optional.bad.access]

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();
};

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.

bad_optional_access();

Effects: Constructs an object of class bad_­optional_­access.

Postconditions: what() returns an implementation-defined ntbs.


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