21 Language support library [language.support]

21.8 Exception handling [support.exception]

21.8.3 Class bad_­exception [bad.exception]

namespace std {
  class bad_exception : public exception {
  public:
    bad_exception() noexcept;
    bad_exception(const bad_exception&) noexcept;
    bad_exception& operator=(const bad_exception&) noexcept;
    const char* what() const noexcept override;
  };
}
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The class bad_­exception defines the type of the object referenced by the exception_­ptr returned from a call to current_­exception ([propagation]) when the currently active exception object fails to copy.
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bad_exception() noexcept;
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Effects: Constructs an object of class bad_­exception.
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bad_exception(const bad_exception&) noexcept; bad_exception& operator=(const bad_exception&) noexcept;
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Effects: Copies an object of class bad_­exception.
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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]).