time_point.h

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/******************************************************************************
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Embedded Template Library.
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Copyright(c) 2025 John Wellbelove
 
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#ifndef ETL_IN_CHRONO_H
  #error DO NOT DIRECTLY INCLUDE THIS FILE. USE CHRONO.H
#endif
 
namespace etl
{
  namespace chrono
  {
    //***************************************************************************
    //***************************************************************************
    template <typename TClock, typename TDuration = typename TClock::duration>
    class time_point
    {
    public:
 
      using clock    = TClock;
      using duration = TDuration;
      using rep      = typename TDuration::rep;
      using period   = typename TDuration::period;
 
      //***************************************************************************
      //***************************************************************************
      ETL_CONSTEXPR time_point() ETL_NOEXCEPT
        : dur(duration::zero())
      {
      }
 
      //***************************************************************************
      //***************************************************************************
      ETL_CONSTEXPR14 explicit time_point(const duration& dur_) ETL_NOEXCEPT
        : dur(dur_)
      {
      }
 
      //***************************************************************************
      //***************************************************************************
      ETL_CONSTEXPR14 time_point(const time_point& rhs) ETL_NOEXCEPT
        : dur(rhs.dur)
      {
      }
 
      //***************************************************************************
      //***************************************************************************
      template <typename TDuration2>
      ETL_CONSTEXPR14 explicit time_point(const time_point<clock, TDuration2>& rhs) ETL_NOEXCEPT
        : dur(rhs.time_since_epoch())
      {
      }
 
      //***************************************************************************
      //***************************************************************************
      ETL_CONSTEXPR14 time_point& operator =(const time_point& rhs) ETL_NOEXCEPT
      {
        dur = rhs.dur;
 
        return *this;
      }
 
      //***************************************************************************
      //***************************************************************************
      ETL_NODISCARD
      ETL_CONSTEXPR14 duration time_since_epoch() const ETL_NOEXCEPT
      {
        return dur;
      }
 
      //***************************************************************************
      //***************************************************************************
      ETL_CONSTEXPR14 time_point& operator +=(const duration& rhs) ETL_NOEXCEPT
      {
        dur += rhs;
 
        return *this;
      }
 
      //***************************************************************************
      //***************************************************************************
      ETL_CONSTEXPR14 time_point& operator -=(const duration& rhs) ETL_NOEXCEPT
      {
        dur -= rhs;
 
        return *this;
      }
 
      //***************************************************************************
      //***************************************************************************
      ETL_NODISCARD
      static ETL_CONSTEXPR14 time_point min() ETL_NOEXCEPT
      {
        return time_point(duration::min());
      }
 
      //***************************************************************************
      //***************************************************************************
      ETL_NODISCARD
      static ETL_CONSTEXPR14 time_point max() ETL_NOEXCEPT
      {
        return time_point(duration::max());
      }
 
      //***********************************************************************
      //***********************************************************************
      ETL_NODISCARD
      ETL_CONSTEXPR14 int compare(const time_point& other) const ETL_NOEXCEPT 
      {
          if (dur < other.dur) return -1;
          if (dur > other.dur) return 1;
 
          return 0;
      }
 
    private:
 
      duration dur;
    };
 
    //***********************************************************************
    //***********************************************************************
    template <typename TToDuration, typename TClock, typename TDuration>
    ETL_NODISCARD
    ETL_CONSTEXPR14 
    etl::chrono::time_point<TClock, TToDuration>
      floor(const etl::chrono::time_point<TClock, TDuration>& tp) ETL_NOEXCEPT
    {
       return etl::chrono::time_point<TClock, TToDuration>(floor<TToDuration>(tp.time_since_epoch()));
    }
 
    //***********************************************************************
    //***********************************************************************
    template <typename TToDuration, typename TClock, typename TDuration>
    ETL_NODISCARD
    ETL_CONSTEXPR14 
    etl::chrono::time_point<TClock, TToDuration>
      ceil(const etl::chrono::time_point<TClock, TDuration>& tp) ETL_NOEXCEPT
    {
      return etl::chrono::time_point<TClock, TToDuration>(ceil<TToDuration>(tp.time_since_epoch()));
    }
 
    //***********************************************************************
    //***********************************************************************
    template <typename TToDuration, typename TClock, typename TDuration>
    ETL_NODISCARD
    ETL_CONSTEXPR14 
    etl::chrono::time_point<TClock, TToDuration>
      round(const etl::chrono::time_point<TClock, TDuration>& tp) ETL_NOEXCEPT
    {
      return etl::chrono::time_point<TClock, TToDuration>(round<TToDuration>(tp.time_since_epoch()));
    }
 
    template <typename TToDuration, typename TClock, typename TDuration>
    ETL_NODISCARD
    ETL_CONSTEXPR14
    etl::chrono::time_point<TClock, TToDuration>
      time_point_cast(const etl::chrono::time_point<TClock, TDuration>& tp) ETL_NOEXCEPT
    {
      TToDuration dur = etl::chrono::duration_cast<TToDuration>(tp.time_since_epoch());
 
      return etl::chrono::time_point<TClock, TToDuration>(dur);
    }
 
    //***************************************************************************
    //***************************************************************************
    template <typename TClock, typename TDuration1, typename TDuration2>
    ETL_CONSTEXPR14 bool operator ==(const time_point<TClock, TDuration1>& lhs, const time_point<TClock, TDuration2>& rhs) ETL_NOEXCEPT
    {
      return lhs.time_since_epoch() == rhs.time_since_epoch();
    }
 
    //***************************************************************************
    //***************************************************************************
    template <typename TClock, typename TDuration1, typename TDuration2>
    ETL_CONSTEXPR14 bool operator !=(const time_point<TClock, TDuration1>& lhs, const time_point<TClock, TDuration2>& rhs) ETL_NOEXCEPT
    {
      return !(lhs == rhs);
    }
 
    //***************************************************************************
    //***************************************************************************
    template <typename TClock, typename TDuration1, typename TDuration2>
    ETL_CONSTEXPR14 bool operator <(const time_point<TClock, TDuration1>& lhs, const time_point<TClock, TDuration2>& rhs) ETL_NOEXCEPT
    {
      return lhs.time_since_epoch() < rhs.time_since_epoch();
    }
 
    //***************************************************************************
    //***************************************************************************
    template <typename TClock, typename TDuration1, typename TDuration2>
    ETL_CONSTEXPR14 bool operator <=(const time_point<TClock, TDuration1>& lhs, const time_point<TClock, TDuration2>& rhs) ETL_NOEXCEPT
    {
      return !(rhs < lhs);
    }
 
    //***************************************************************************
    //***************************************************************************
    template <typename TClock, typename TDuration1, typename TDuration2>
    ETL_CONSTEXPR14 bool operator >(const time_point<TClock, TDuration1>& lhs, const time_point<TClock, TDuration2>& rhs) ETL_NOEXCEPT
    {
      return rhs < lhs;
    }
 
    //***************************************************************************
    //***************************************************************************
    template <typename TClock, typename TDuration1, typename TDuration2>
    ETL_CONSTEXPR14 bool operator >=(const time_point<TClock, TDuration1>& lhs, const time_point<TClock, TDuration2>& rhs) ETL_NOEXCEPT
    {
      return !(lhs < rhs);
    }
  }
 
  //***********************************************************************
  //***********************************************************************
#if ETL_USING_CPP20
  template <typename TClock, typename TDuration1, typename TDuration2>
  [[nodiscard]] constexpr auto operator <=>(const etl::chrono::time_point<TClock, TDuration1>& lhs, const etl::chrono::time_point<TClock, TDuration2>& rhs) ETL_NOEXCEPT
  {
    return (lhs.time_since_epoch() <=> rhs.time_since_epoch());
  }
#endif
 
  //***************************************************************************
  //***************************************************************************
  template <typename TClock, typename TDuration1, typename TDuration2>
  struct common_type<etl::chrono::time_point<TClock, TDuration1>, etl::chrono::time_point<TClock, TDuration2>>
  {
    using type = etl::chrono::time_point<TClock, typename etl::common_type<TDuration1, TDuration2>::type>;
  };
}