22 General utilities library [utilities]
namespace std {
class bad_optional_access : public exception {
public:
constexpr const char* what() const noexcept override;
};
}
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
.constexpr const char* what() const noexcept override;
Returns: An
implementation-defined
ntbs,
which during constant evaluation is encoded with
the ordinary literal encoding (
[lex.ccon])
.