unreachable_sentinel.hpp

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//
// Created by yonggyulee on 2023/12/24.
//
 
#ifndef VCCC_ITERATOR_UNREACHABLE_SENTINEL_HPP_
#define VCCC_ITERATOR_UNREACHABLE_SENTINEL_HPP_
 
#include "vccc/__core/inline_or_static.hpp"
#include "vccc/__iterator/weakly_incrementable.hpp"
 
namespace vccc {
 
 
struct unreachable_sentinel_t {
  template<typename I>
  friend constexpr std::enable_if_t<weakly_incrementable<I>::value, bool>
  operator==(unreachable_sentinel_t, const I&) noexcept {
    return false;
  }
};
 
VCCC_INLINE_OR_STATIC constexpr unreachable_sentinel_t unreachable_sentinel{};
 
 
} // namespace vccc
 
#endif // VCCC_ITERATOR_UNREACHABLE_SENTINEL_HPP_