17 Language support library [support]

17.9 Exception handling [support.exception]

17.9.4 Class bad_exception [bad.exception]

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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.