namespace std {
class length_error : public logic_error {
public:
explicit length_error(const string& what_arg);
explicit length_error(const char* what_arg);
};
}The class length_error defines the type of objects thrown as exceptions to report an attempt to produce an object whose length exceeds its maximum allowable size.
length_error(const string& what_arg);
length_error(const char* what_arg);