for (int i = 0; i < countof(arr); i++) {
   int x = arr[i];
   ...
}

#include <stdio.h>

template<int n>
void foo(int (&arr)[n]) {
	int sz = sizeof(arr);
	printf("size: %d\n",sz);
}

int main(int c, char **v) {
	int a[40];
	foo(a);
}

ondra@linda:/tmp$ g++ test.cpp -o test
ondra@linda:/tmp$ ./test
size: 160
ondra@linda:/tmp$

template<int n>
void fce(int pole[n]) {
  int a;
  a = sizeof(pole);
}