c++ - How do I pass a truly immutable 2D array to a function? -

i have function:

void foo(const double *const *matrix, unsigned num_rows, unsigned num_columns){     //matrix[0][0] = 5; // error: expression must modifiable lvalue     (unsigned = 0; < num_rows; i++) delete matrix[i];     delete matrix; } 

...wherein function cannot change values @ given index in matrix, yet still able delete matrix or of rows. there way pass in 2d matrix , guarantee not altered in way?

edit: doesn't there's way this, i'll switch using vectors.

no.

delete can called on pointer if it's passed const & or declared const because pointer not going changed.

there no way prevent doing

unsigned char *p = (unsigned char *)your_precious_data_pointer; *p = 42; 

get on it.

const correctness designed detect accidental mistakes, not preventing intentional actions programmers. it's not security.

it can debated if it's tool preventing accidental mistakes.