Method MyArray

tests/test_ndarray.cpp:657–657

        double* d;
     public:
        MyArray() { d = new double[5] { 0.0, 1.0, 2.0, 3.0, 4.0 }; }
        ~MyArray() { delete[] d; }
        double* data() const { return d; }
        void mutate() { for (int i = 0; i < 5; ++i) d[i] += 0.5; }