HDF5, C interface: From jagged array to variable lenght

HDF5VL.cpp

// Test data
std::vector< std::vector<int> > jagged_array(3);
jagged_array[0] = {0};
jagged_array[1] = {0, 1, 2, 3};
jagged_array[2] = {0, 1, 2};

hvl_t * X = (hvl_t *)malloc(jagged_array.size() * sizeof(hvl_t))
for (unsigned int i = 0; i < jagged_array.size(); ++i) {
    X[i].len = jagged_array[i].size();
    int * ptr = (int *) malloc (X[i].len * sizeof(int));
    for (unsigned int j = 0; j < X[i].len; ++j) {
        ptr[j] = jagged_array[i][j];
    }
    X[i].p = (void *) ptr;
}