说明：  样条类的C++,该类包括三次样条的插值,拟合和B样条的插值,拟和等功能 。自己编写的简单适用的函数，粘上即可用。
(Spline type of C++, Such including the cubic spline interpolation, fitting and B-spline interpolation, to be and functions. I have written a simple application of the function, you can use glue.)