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  1. #include <type_traits>
  2.  
  3. template<class T> class Range {
  4.     class const_iterator {
  5.         using I = typename std::conditional<std::is_enum<T>::value,
  6.               typename std::underlying_type<T>::type, T>::type;
  7.         I i;
  8.         public:
  9.         const_iterator(const T &i) : i(static_cast<I>(i)) {}
  10.         const T operator*() const { return static_cast<T>(i); }
  11.         const_iterator &operator++(){ ++i; return *this; }
  12.         bool operator!=(const const_iterator &o) const { return i != o.i; }
  13.     };
  14.     T b, e;
  15.     public:
  16.  
  17.     Range(const T &b, const T &e) : b(b), e(e) {}
  18.     const_iterator begin() const { return b; }
  19.     const_iterator end() const { return e; }
  20. };
  21.  
  22. enum struct Square : std::size_t {
  23.     ZERO, ONE, TWO, THREE, SENTINEL
  24. };
  25.  
  26. Range<Square> SQ(Square::ZERO, Square::SENTINEL);
  27.  
  28. #include <iostream>
  29. using namespace std;
  30. int main(){
  31.     for(auto s : SQ) cout << static_cast<size_t>(s) << endl;
  32.     return 0;
  33. }
Success #stdin #stdout 0s 3460KB
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https://ideone.com/914Iia
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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