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; }; }
bad_exception() noexcept;
bad_exception(const bad_exception&) noexcept;
bad_exception& operator=(const bad_exception&) noexcept;
const char* what() const noexcept override;