http://www.informit.com/guides/content.asp?g=cplusplus&seqNum=207&rl=1

template <class T, int _size> struct array_wrapper

{

 //typedef names used in STL algorithms and containers

 typedef T value_type;

 typedef T* iterator;

 typedef const T * const_iterator;

 typedef T& reference;

 typedef const T& const_reference;

T v[_size]; //the actual array

// member functions of STL containers

operator T* () {return v;}

reference operator[] (size_t idx) {return v[idx];}

const_reference operator[] (size_t idx) const {return v[idx];}

iterator begin() {return v;}

const_iterator begin() const {return v;}

iterator end() {return v+_size;}

const_iterator end() const {return v+_size;}

size_t size() const {return _size;}

};

void func(int *, int sz); // C function 

//wrap an array of 20 int's initializing its members to 0

array_wrapper<int, 20> arr={0}; 

func(arr, arr.size()); //using T* conversion operator