In C++ I have a function that only requires read-only access to an array but is mistakenly declared as receiving a non-const pointer:

```
size_t countZeroes( int* array, size_t count )
{
    size_t result = 0;        
    for( size_t i = 0; i < count; i++ ) {
       if( array[i] == 0 ) {
           ++result;
       }
    }
    return result;
}

```

and I need to call it for a const array:

```
static const int Array[] = { 10, 20, 0, 2};

countZeroes( const_cast<int*>( Array ), sizeof( Array ) / sizeof( Array[0] ) );

```

will this be undefined behaviour? If so - when will the program run into UB - when doing the const\_cast and calling the functon or when accessing the array?