Range-Based Loop (C++11 and above)

// the simple form
for (range-declaration : range-expression)
// which expands to
auto && __range = range-expression ;
for (auto __begin = begin_expr, __end = end_expr; __begin != __end;
     ++__begin) {
    range-declaration = *__begin;
    loop-statement
}

The range-expression is where the magic happens. It needs to be

An array with a known size: begin_expr is __range and end_expr is (__range + bound).
a class type with a member named begin() (__range.begin()) and a member end() (__range.end()).
By Koenig lookup to find a pair of free functions of begin(__range) and end(__range)=.
Thus, the following implementation from Windows Implementation Library is totally valid.

template <typename T>
 class pointer_range
 {
 public:
     pointer_range(T begin_, T end_) : m_begin(begin_), m_end(end_) {}
     T begin() const  { return m_begin; }
     T end() const    { return m_end; }
 private:
     T m_begin;
     T m_end;
 };

And the following use runs fine.

int main() {
    int a[10] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0};

    for (int i : pointer_range<int*>(&a[0], &a[10])) {
        std::cout << i << ' ';
    }
    std::cout << '\n';
}