21 Language support library [language.support]

21.7 Type identification [support.rtti]

21.7.4 Class bad_­typeid [bad.typeid]

namespace std {
  class bad_typeid : public exception {
  public:
    bad_typeid() noexcept;
    bad_typeid(const bad_typeid&) noexcept;
    bad_typeid& operator=(const bad_typeid&) noexcept;
    const char* what() const noexcept override;
  };
}
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The class bad_­typeid defines the type of objects thrown as exceptions by the implementation to report a null pointer in a typeid expression ([expr.typeid]).
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bad_typeid() noexcept;
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Effects: Constructs an object of class bad_­typeid.
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bad_typeid(const bad_typeid&) noexcept; bad_typeid& operator=(const bad_typeid&) noexcept;
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Effects: Copies an object of class bad_­typeid.
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const char* what() const noexcept override;
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Returns: An implementation-defined ntbs.
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Remarks: The message may be a null-terminated multibyte string ([multibyte.strings]), suitable for conversion and display as a wstring ([string.classes], [locale.codecvt])