iterator.hpp

#ifndef LIBSBX_UTILITY_ITERATOR_HPP_
#define LIBSBX_UTILITY_ITERATOR_HPP_
 
#include <cstddef>
#include <iterator>
#include <type_traits>
 
namespace sbx::utility {
 
template<typename Category, typename Type, typename Distance = std::ptrdiff_t, typename Pointer = Type*, typename Reference = Type&>
struct iterator {
  using iterator_category = Category;
  using value_type = Type;
  using difference_type = Distance;
  using pointer = Pointer;
  using reference = Reference;
}; // struct iterator
 
template<typename Type>
concept iterable = requires(Type t) {
  { std::begin(t) } -> std::same_as<typename Type::iterator>;
  { std::end(t) } -> std::same_as<typename Type::iterator>;
} || requires(Type t) {
  { std::begin(t) } -> std::same_as<typename Type::const_iterator>;
  { std::end(t) } -> std::same_as<typename Type::const_iterator>;
} || std::is_array_v<Type>;
 
} // namespace sbx::utility
 
#endif // LIBSBX_UTILITY_ITERATOR_HPP_