cpp-descriptive-pointers/include/pointers/detail/compare.hpp

//
//  ptr_compare.hpp
//  pointers
//
//  Created by Sam Jaffe on 1/5/17.
//

#pragma once

namespace pointers { namespace detail {
  template <typename Self> struct pointer_compare {
    friend bool operator==(Self const & lhs, Self const & rhs) {
      return lhs.get() == rhs.get();
    }
    friend bool operator<(Self const & lhs, Self const & rhs) {
      return lhs.get() < rhs.get();
    }
    friend bool operator!=(Self const & lhs, Self const & rhs) {
      return !(lhs == rhs);
    }
    friend bool operator>(Self const & lhs, Self const & rhs) {
      return rhs < lhs;
    }
    friend bool operator<=(Self const & lhs, Self const & rhs) {
      return !(rhs < lhs);
    }
    friend bool operator>=(Self const & lhs, Self const & rhs) {
      return !(lhs < rhs);
    }
    friend bool operator==(Self const & lhs, std::nullptr_t) { return !lhs; }
    friend bool operator<(Self const & lhs, std::nullptr_t) {
      return lhs.get() < nullptr;
    }
    friend bool operator!=(Self const & lhs, std::nullptr_t) { return !!lhs; }
    friend bool operator>(Self const & lhs, std::nullptr_t) {
      return nullptr < lhs;
    }
    friend bool operator<=(Self const & lhs, std::nullptr_t) {
      return !(nullptr < lhs);
    }
    friend bool operator>=(Self const & lhs, std::nullptr_t) {
      return !(lhs < nullptr);
    }
    friend bool operator==(std::nullptr_t, Self const & rhs) { return !rhs; }
    friend bool operator<(std::nullptr_t, Self const & rhs) {
      return nullptr < rhs.get();
    }
    friend bool operator!=(std::nullptr_t, Self const & rhs) { return !!rhs; }
    friend bool operator>(std::nullptr_t, Self const & rhs) {
      return rhs < nullptr;
    }
    friend bool operator<=(std::nullptr_t, Self const & rhs) {
      return !(rhs < nullptr);
    }
    friend bool operator>=(std::nullptr_t, Self const & rhs) {
      return !(nullptr < rhs);
    }
  };
}}