hh_mm_ss.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
 
#include "../../absolute.h"
#include "../../power.h"
 
namespace etl
{
  //***********************************************************************
  //***********************************************************************
  template <typename TDuration>
  ETL_NODISCARD
  ETL_CONSTEXPR14 
  typename etl::enable_if<etl::is_specialization<TDuration, etl::chrono::duration>::value, TDuration>::type
    absolute(TDuration dur) ETL_NOEXCEPT
  {
    return TDuration((dur.count() < 0) ? -dur.count() : dur.count());
  }
 
  namespace chrono
  {
    //***********************************************************************
    //***********************************************************************
    template <typename TDuration>
    class hh_mm_ss
    {
    private:
 
      // Helper template to calculate the number of digits in a denominator at compile time
      template <uintmax_t Den, int Width = 0>
      struct fractional_width_helper
      {
        static constexpr int value = fractional_width_helper<Den / 10, Width + 1>::value;
      };
 
      // Base case: when Den == 1, stop recursion
      template <int Width>
      struct fractional_width_helper<1, Width>
      {
        static constexpr int value = Width;
      };
 
      // Special case: when Den == 0 (invalid denominator), return 0
      template <int Width>
      struct fractional_width_helper<0, Width>
      {
        static constexpr int value = 0;
      };
 
      // Calculate fractional width for TDuration
      template <typename TDur>
      struct calculate_fractional_width
      {
        static constexpr int value = (TDur::period::den == 1)
                                     ? 0
                                     : fractional_width_helper<TDur::period::den>::value;
      };
 
    public:
 
      ETL_STATIC_ASSERT((etl::is_specialization<TDuration, etl::chrono::duration>::value), "TDuration is not a etl::chrono::duration type");
 
      static constexpr int fractional_width = calculate_fractional_width<TDuration>::value;
 
      //***********************************************************************
      //***********************************************************************
      using precision = etl::chrono::duration<common_type_t<typename TDuration::rep, etl::chrono::seconds::rep>, 
                                              ratio<1, etl::power<10, fractional_width>::value>>;
 
      //***********************************************************************
      //***********************************************************************
      ETL_CONSTEXPR 
      hh_mm_ss() ETL_NOEXCEPT
        : d(TDuration::zero())
      {
      }
 
      //***********************************************************************
      //***********************************************************************
      ETL_CONSTEXPR14
      explicit hh_mm_ss(TDuration d_) ETL_NOEXCEPT
        : d(d_)
      {
      }
 
      //***********************************************************************
      //***********************************************************************
      ETL_NODISCARD
      ETL_CONSTEXPR14 
      bool is_negative() const ETL_NOEXCEPT
      {
        return d < TDuration::zero();
      }
 
      //***********************************************************************
      //***********************************************************************
      ETL_NODISCARD 
      ETL_CONSTEXPR14 
      etl::chrono::hours hours() const ETL_NOEXCEPT
      {
        auto dur = etl::absolute(d);
 
        return etl::chrono::duration_cast<etl::chrono::hours>(dur);
      }
 
      //***********************************************************************
      //***********************************************************************
      ETL_NODISCARD
      ETL_CONSTEXPR14 etl::chrono::minutes minutes() const ETL_NOEXCEPT
      {
        auto dur = etl::absolute(d) - hours();
 
        return etl::chrono::duration_cast<etl::chrono::minutes>(dur);
      }
 
      //***********************************************************************
      //***********************************************************************
      ETL_NODISCARD 
      ETL_CONSTEXPR14
      etl::chrono::seconds seconds() const ETL_NOEXCEPT
      {
        auto dur = etl::absolute(d) - hours() - minutes();
 
        return etl::chrono::duration_cast<etl::chrono::seconds>(dur);
      }
 
      //***********************************************************************
      //***********************************************************************
      ETL_NODISCARD
      ETL_CONSTEXPR14 precision subseconds() const ETL_NOEXCEPT
      {
        return etl::absolute(d) - etl::chrono::duration_cast<etl::chrono::seconds>(etl::absolute(d));
      }
 
      //***********************************************************************
      //***********************************************************************
      ETL_NODISCARD
      ETL_CONSTEXPR14 explicit operator precision() const ETL_NOEXCEPT
      {
        return to_duration();
      }
 
      //***********************************************************************
      //***********************************************************************
      ETL_NODISCARD
      ETL_CONSTEXPR14 
      precision to_duration() const ETL_NOEXCEPT
      {
        return d;
      }
 
    private:
      
      TDuration d;
    };
 
    template <typename TDuration>
    constexpr int etl::chrono::hh_mm_ss<TDuration>::fractional_width;
  }
}