18 Language support library [language.support]

18.8 Exception handling [support.exception]

18.8.3 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;
  };
}
1

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.

bad_exception() noexcept;

2

Effects: Constructs an object of class bad_exception.

bad_exception(const bad_exception&) noexcept; bad_exception& operator=(const bad_exception&) noexcept;

3

Effects: Copies an object of class bad_exception.

const char* what() const noexcept override;

4

Returns: An implementation-defined ntbs.

5

Remarks: The message may be a null-terminated multibyte string ([multibyte.strings]), suitable for conversion and display as a wstring ([string.classes], [locale.codecvt]).