enhanced for loop with multidimensional array c++

Question

How would I use an enhanced for loop with a multidimensional array? (c++11, although feel free to answer for other versions)

We'll start with two dimensions...

int array[10][9];

//loop through first dimension (10)
    for(int i : sizeof(array)) {
       //do something
    }

Compiler error: this range-based 'for' statement requires a suitable "begin" function and none was found

Could it have something to do with a multidimensional array being really still 1 dimension? In other words, int array[10][9] is equivalent to int array[90]

Answer 1

To use range based loops, you should pass a container in which the begin and end has beed defined. Try this:

for(auto &rows: array) // rows
{
    for(auto &x: rows)
    {
        // ...
    }
}

int array[10][9] is not equivalent to int array[19] , it can be defined as int array[10*9] .