将矩阵作为函数指针传递

Question

In my project I've these files:

functions.h
functions.cc
main.cc

I'm trying to pass Matrix to functions as pointers in this way:

main.cc

// Size -> const short Size = 10;
int mtr1[Size][Size];
matrix_insert((int *)mtr1);

functions.h

void matrix_insert(int *mtr);

functions.cc

void matrix_insert(int *mtr) {
  short i, j;

  for (i = 0; i < Size; i++) {
    for (j = 0; j < Size; j++) {
      std::cin >> *(mtr + i * Size + j);
    }
  }
}

This is actually working but I don't like this way...
Is there a better method?

Thanks!

EDIT: Is possible to emulate matrix with vector?

Answer 1

If you really want to use C arrays, then you can do it as follows:

main.cc

int mtr1[Size][Size];
matrix_insert(mtr1);

functions.h

const short Size = 10;
void matrix_insert(int mtr[Size][Size]);

functions.cc

void matrix_insert(int mtr[Size][Size]) {
  short i, j;

  for (i = 0; i < Size; i++) {
    for (j = 0; j < Size; j++) {
      std::cin >> mtr[i][j];
    }
  }
}

Working version: http://ideone.com/1ik7T9

Answer 2

Create a matrix class like this one:

http://www.parashift.com/c++-faq/matrix-subscript-op.html

Answer 3

You can do this using templates:

template<int Size>
void matrix_insert(int (&mtr)[Size][Size])
{
    short i, j;

    for (i = 0; i < Size; i++)
    {
        for (j = 0; j < Size; j++)
        {
            std::cin >> mtr[i][j];
        }
    }
}