Access a 1D array as a 2D array in C++

Question

This has bothered me for a while. A lot of times I find myself making a large buffer to hold a \"maximum\" amount of data. This helps me avoid dynamically allocating and dea

Answer 1

If you know your row/column length (depending on row or column major and what not)... I believe it's something like...

char get_value(char *arr, int row_len, int x, int y) {
    return arr[x * row_len + y];
}

... for treating a 1D array as 2D.

Another thing for 2D dynamic C arrays.

char **arr = (char **)malloc(row_size * sizeof(char *));
int x;
for (x = 0; x < row_size; ++x) {
    arr[x] = (char *)malloc(col_size * sizeof(char));
}

I could have my columns and rows mixed though...

Like everyone else has said, vectors are nice since you're using C++:

auto matrix_like_thing = std::vector >(rows, std::vector(cols, '\0'));
matrix_like_thing[0][4] = 't';