UF_EVAL_ask_spline_knots 函数的用法

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UF_EVAL_p_t  evaluator;     UF_EVAL_initialize(obj1, &evaluator);     double limits[2];     double mid_t;     double value;     UF_EVAL_ask_limits(evaluator, limits);     UF_CURVE_ask_arc_length(obj1, limits[0], limits[1], UF_MODL_units_t::UF_MODL_UNITS_PART, &value);     int     n_knots;     double   *knots;     UF_EVAL_ask_spline_knots(evaluator, &n_knots, &knots);