#include <vector>
#include <iostream>

class SplineImpl {
public:
    SplineImpl(const std::vector<double>& x, const std::vector<double>& y, double a, double b) {
        x_[0] = x[0];
        x_[1] = x[1];
        y_[0] = y[0];
        y_[1] = y[1];
        a_ = a;
        b_ = b;
        if (mySplineSnd(x_, y_, a, b, y2_) != 0) {
            std::cerr << "shit happens" << std::endl;
        }
    }
    double Interpolate(double x) {

    }
private:
    double x_[2];
    double y_[2];
    double* y2_ = new double[2];
    double a_, b_;
};