17 Language support library [support]

17.9 Exception handling [support.exception]

17.9.3 Class bad_­exception [bad.exception]

namespace std {
  class bad_exception : public exception {
  public:
    // see [exception] for the specification of the special member functions
    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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const char* what() const noexcept override;
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Returns: An implementation-defined ntbs.