20 General utilities library [utilities]

20.7 Variants [variant]

20.7.11 Class bad_­variant_­access [variant.bad.access]

class bad_variant_access : public exception {
public:
  bad_variant_access() noexcept;
  const char* what() const noexcept override;
};
Objects of type bad_­variant_­access are thrown to report invalid accesses to the value of a variant object.
bad_variant_access() noexcept;
Constructs a bad_­variant_­access object.
const char* what() const noexcept override;
Returns: An implementation-defined ntbs.