month_day.h

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/******************************************************************************
The MIT License(MIT)
 
Embedded Template Library.
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Copyright(c) 2023 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
  {
    class month_day
    {
    public:
 
      //*************************************************************************
      //*************************************************************************
      month_day() = default;
 
      //*************************************************************************
      //*************************************************************************
      ETL_CONSTEXPR14 month_day(const etl::chrono::month& m_, 
                                const etl::chrono::day&   d_) ETL_NOEXCEPT
        : m(m_)
        , d(d_)
      {
      }
 
      //*************************************************************************
      //*************************************************************************
      ETL_NODISCARD
      ETL_CONSTEXPR14 etl::chrono::month month() const ETL_NOEXCEPT
      {
        return m;
      }
 
      //*************************************************************************
      //*************************************************************************
      ETL_NODISCARD
      ETL_CONSTEXPR14 etl::chrono::day day() const ETL_NOEXCEPT
      {
        return d;
      }
 
      //*************************************************************************
      //*************************************************************************
      ETL_NODISCARD
      ETL_CONSTEXPR14 bool ok() const ETL_NOEXCEPT
      {       
        if (!m.ok() || !d.ok())
        {
          return false;
        }
 
        unsigned max_day = 0;
 
        unsigned m_v = static_cast<unsigned>(m);
        max_day = private_chrono::days_in_month[m_v];
 
        return (max_day > 0) && 
               (static_cast<unsigned>(d) >= 1) && 
               (static_cast<unsigned>(d) <= max_day);
      }
 
      //***********************************************************************
      //***********************************************************************
      ETL_NODISCARD
      ETL_CONSTEXPR14 int compare(const month_day& other) const ETL_NOEXCEPT 
      {
        if (m < other.m) return -1;
        if (m > other.m) return 1;
        if (d < other.d) return -1;
        if (d > other.d) return 1;
      
        return 0;
      }
 
    private:
 
      etl::chrono::month m;
      etl::chrono::day   d;
    };
 
    //*************************************************************************
    //*************************************************************************
    inline ETL_CONSTEXPR14 bool operator ==(const etl::chrono::month_day& lhs, 
                                            const etl::chrono::month_day& rhs) ETL_NOEXCEPT
    {
      return (lhs.day() == rhs.day()) && (lhs.month() == rhs.month());
    }
 
    //*************************************************************************
    //*************************************************************************
    inline ETL_CONSTEXPR14 bool operator !=(const etl::chrono::month_day& lhs, 
                                            const etl::chrono::month_day& rhs) ETL_NOEXCEPT
    {
      return !(lhs == rhs);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_NODISCARD ETL_CONSTEXPR14
    inline bool operator <(const etl::chrono::month_day& lhs,
                           const etl::chrono::month_day& rhs) ETL_NOEXCEPT
    {
      if (lhs.month() < rhs.month())
      {
        return true;
      }
      else if (lhs.month() == rhs.month())
      {
        return lhs.day() < rhs.day();
      }
      else
      {
        return false;
      }
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_NODISCARD ETL_CONSTEXPR14
    inline bool operator <=(const etl::chrono::month_day& lhs,
                            const etl::chrono::month_day& rhs) ETL_NOEXCEPT
    {
      return !(rhs < lhs);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_NODISCARD ETL_CONSTEXPR14
    inline bool operator >(const etl::chrono::month_day& lhs,
                           const etl::chrono::month_day& rhs) ETL_NOEXCEPT
    {
      return rhs < lhs;
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_NODISCARD ETL_CONSTEXPR14
    inline bool operator >=(const etl::chrono::month_day& lhs,
                            const etl::chrono::month_day& rhs) ETL_NOEXCEPT
    {
      return !(lhs < rhs);
    }
 
    //***********************************************************************
    //***********************************************************************
#if ETL_USING_CPP20
    [[nodiscard]] inline constexpr auto operator <=>(const etl::chrono::month_day& lhs, 
                                                     const etl::chrono::month_day& rhs) ETL_NOEXCEPT
    {
      auto cmp = lhs.month() <=> rhs.month();
 
      if (cmp != 0)
      {
        return cmp;
      }
      else
      {
        return lhs.day() <=> rhs.day();
      }
    }
#endif
 
    //*************************************************************************
    //*************************************************************************
    class month_day_last
    {
    public:
 
      //*************************************************************************
      //*************************************************************************
      ETL_CONSTEXPR14 explicit month_day_last(const etl::chrono::month& m_) ETL_NOEXCEPT
        : m(m_)
      {
      }
 
      //*************************************************************************
      //*************************************************************************
      ETL_CONSTEXPR14 etl::chrono::month month() const ETL_NOEXCEPT
      {
        return m;
      }
 
      //*************************************************************************
      //*************************************************************************
      bool ok() const ETL_NOEXCEPT
      {
        return m.ok();
      }
 
      //***********************************************************************
      //***********************************************************************
      ETL_NODISCARD
      ETL_CONSTEXPR14 int compare(const month_day& other) const ETL_NOEXCEPT 
      {
        if (m < other.month()) return -1;
        if (m > other.month()) return 1;
 
        return 0;
      }
 
    private:
 
      etl::chrono::month m;
    };
 
    //***********************************************************************
    //***********************************************************************
    inline ETL_CONSTEXPR14 bool operator ==(const etl::chrono::month_day_last& mdl1, 
                                            const etl::chrono::month_day_last& mdl2) ETL_NOEXCEPT
    {
      return (static_cast<unsigned>(mdl1.month()) == static_cast<unsigned>(mdl2.month()));
    }
 
    //***********************************************************************
    //***********************************************************************
    inline ETL_CONSTEXPR14 bool operator !=(const etl::chrono::month_day_last& mdl1, 
                                            const etl::chrono::month_day_last& mdl2) ETL_NOEXCEPT
    {
      return !(mdl1 == mdl2);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_NODISCARD ETL_CONSTEXPR14
    inline bool operator <(const etl::chrono::month_day_last& lhs,
                           const etl::chrono::month_day_last& rhs) ETL_NOEXCEPT
    {
      return (lhs.month() < rhs.month());
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_NODISCARD ETL_CONSTEXPR14
    inline bool operator <=(const etl::chrono::month_day_last& lhs,
                            const etl::chrono::month_day_last& rhs) ETL_NOEXCEPT
    {
      return !(rhs < lhs);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_NODISCARD ETL_CONSTEXPR14
    inline bool operator >(const etl::chrono::month_day_last& lhs,
                           const etl::chrono::month_day_last& rhs) ETL_NOEXCEPT
    {
      return rhs < lhs;
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_NODISCARD ETL_CONSTEXPR14
    inline bool operator >=(const etl::chrono::month_day_last& lhs,
                            const etl::chrono::month_day_last& rhs) ETL_NOEXCEPT
    {
      return !(lhs < rhs);
    }
 
    //***********************************************************************
    //***********************************************************************
#if ETL_USING_CPP20
    [[nodiscard]] inline constexpr auto operator <=>(const etl::chrono::month_day_last& mdl1, const etl::chrono::month_day_last& mdl2) ETL_NOEXCEPT
    {
      return (static_cast<unsigned>(mdl1.month()) <=> static_cast<unsigned>(mdl2.month()));
    }
#endif
  }
 
  //*************************************************************************
  //*************************************************************************
#if ETL_USING_8BIT_TYPES
  template <>
  struct hash<etl::chrono::month_day>
  {
    size_t operator()(const etl::chrono::month_day& md) const
    {   
      etl::chrono::month::rep m = static_cast<etl::chrono::month::rep>(static_cast<unsigned>(md.month()));
      etl::chrono::day::rep   d = static_cast<etl::chrono::day::rep>(static_cast<unsigned>(md.day()));
 
      uint8_t buffer[sizeof(m) + sizeof(d)];
 
      memcpy(buffer,             &m, sizeof(m));
      memcpy(buffer + sizeof(m), &d, sizeof(d));
 
      return etl::private_hash::generic_hash<size_t>(buffer, buffer + sizeof(m) + sizeof(d));
    }
  };
#endif
 
  //*************************************************************************
  //*************************************************************************
#if ETL_USING_8BIT_TYPES
  template <>
  struct hash<etl::chrono::month_day_last>
  {
    size_t operator()(const etl::chrono::month_day_last& mdl) const
    {
      etl::chrono::month::rep value = static_cast<etl::chrono::month::rep>(static_cast<unsigned>(mdl.month()));
      const uint8_t* p = reinterpret_cast<const uint8_t*>(&value);
 
      return etl::private_hash::generic_hash<size_t>(p, p + sizeof(value));
    }
  };
#endif
}