byte.h

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/******************************************************************************
The MIT License(MIT)
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
Copyright(c) 2022 John Wellbelove
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
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******************************************************************************/
 
#ifndef ETL_BYTE_INCLUDED
#define ETL_BYTE_INCLUDED
 
#include "platform.h"
#include "type_traits.h"
 
namespace etl
{
#if ETL_USING_CPP11 && !defined(ETL_BYTE_FORCE_CPP03_IMPLEMENTATION)
 
  enum class byte : unsigned char
  {
  };
 
  //*************************************************************************
  //*************************************************************************
  template <typename TInteger>
  constexpr typename etl::enable_if<etl::is_integral<TInteger>::value, TInteger>::type to_integer(etl::byte b) ETL_NOEXCEPT
  {
    return TInteger(b);
  }
 
  //*************************************************************************
  //*************************************************************************
  template <typename TInteger>
  constexpr typename etl::enable_if<etl::is_integral<TInteger>::value, etl::byte>::type operator<<(etl::byte b, TInteger shift) ETL_NOEXCEPT
  {
    return etl::byte(static_cast<unsigned int>(b) << shift);
  }
 
  //*************************************************************************
  //*************************************************************************
  template <typename TInteger>
  constexpr typename etl::enable_if<etl::is_integral<TInteger>::value, etl::byte>::type operator>>(etl::byte b, TInteger shift) ETL_NOEXCEPT
  {
    return etl::byte(static_cast<unsigned int>(b) >> shift);
  }
 
  //*************************************************************************
  //*************************************************************************
  template <typename TInteger>
  constexpr typename etl::enable_if<etl::is_integral<TInteger>::value, etl::byte&>::type operator<<=(etl::byte& b, TInteger shift) ETL_NOEXCEPT
  {
    return b = b << shift;
  }
 
  //*************************************************************************
  //*************************************************************************
  template <typename TInteger>
  constexpr typename etl::enable_if<etl::is_integral<TInteger>::value, etl::byte&>::type operator>>=(etl::byte& b, TInteger shift) ETL_NOEXCEPT
  {
    return b = b >> shift;
  }
 
  //*************************************************************************
  //*************************************************************************
  inline constexpr etl::byte operator|(etl::byte lhs, etl::byte rhs) ETL_NOEXCEPT
  {
    return etl::byte(static_cast<unsigned int>(lhs) | static_cast<unsigned int>(rhs));
  }
 
  //*************************************************************************
  //*************************************************************************
  inline constexpr etl::byte operator&(etl::byte lhs, etl::byte rhs) ETL_NOEXCEPT
  {
    return etl::byte(static_cast<unsigned int>(lhs) & static_cast<unsigned int>(rhs));
  }
 
  //*************************************************************************
  //*************************************************************************
  inline constexpr etl::byte operator^(etl::byte lhs, etl::byte rhs) ETL_NOEXCEPT
  {
    return etl::byte(static_cast<unsigned int>(lhs) ^ static_cast<unsigned int>(rhs));
  }
 
  //*************************************************************************
  //*************************************************************************
  inline ETL_CONSTEXPR14 etl::byte& operator|=(etl::byte& lhs, etl::byte rhs) ETL_NOEXCEPT
  {
    return lhs = lhs | rhs;
  }
 
  //*************************************************************************
  //*************************************************************************
  inline ETL_CONSTEXPR14 etl::byte& operator&=(etl::byte& lhs, etl::byte rhs) ETL_NOEXCEPT
  {
    return lhs = lhs & rhs;
  }
 
  //*************************************************************************
  //*************************************************************************
  inline ETL_CONSTEXPR14 etl::byte& operator^=(etl::byte& lhs, etl::byte rhs) ETL_NOEXCEPT
  {
    return lhs = lhs ^ rhs;
  }
 
  //*************************************************************************
  //*************************************************************************
  inline constexpr etl::byte operator~(etl::byte b) ETL_NOEXCEPT
  {
    return etl::byte(~static_cast<unsigned int>(b));
  }
 
#else
 
  //*************************************************************************
  //*************************************************************************
  class byte
  {
  public:
 
    // Friend functions
    template <typename TInteger>
    friend typename etl::enable_if<etl::is_integral<TInteger>::value, TInteger>::type to_integer(etl::byte b);
 
    friend bool operator==(etl::byte lhs, etl::byte rhs);
 
    // Default constructor
    byte()
      : value(0U)
    {
    }
 
    // Construct from a value castable to unsigned char
    template <typename T>
    explicit byte(T v)
      : value(static_cast<unsigned char>(v))
    {
    }
 
    // Cast to a T
    template <typename T>
    operator T() const
    {
      return static_cast<T>(value);
    }
 
  private:
 
    // The byte value
    unsigned char value;
  };
 
  //*************************************************************************
  //*************************************************************************
  inline bool operator==(etl::byte lhs, etl::byte rhs)
  {
    return (lhs.value == rhs.value);
  }
 
  //*************************************************************************
  //*************************************************************************
  inline bool operator!=(etl::byte lhs, etl::byte rhs)
  {
    return !(lhs == rhs);
  }
 
  //*************************************************************************
  //*************************************************************************
  template <typename TInteger>
  typename etl::enable_if<etl::is_integral<TInteger>::value, TInteger>::type to_integer(etl::byte b)
  {
    return TInteger(b);
  }
 
  //*************************************************************************
  //*************************************************************************
  template <typename TInteger>
  typename etl::enable_if<etl::is_integral<TInteger>::value, etl::byte>::type operator<<(etl::byte b, TInteger shift)
  {
    return etl::byte(to_integer<unsigned int>(b) << shift);
  }
 
  //*************************************************************************
  //*************************************************************************
  template <typename TInteger>
  typename etl::enable_if<etl::is_integral<TInteger>::value, etl::byte>::type operator>>(etl::byte b, TInteger shift)
  {
    return etl::byte(to_integer<unsigned int>(b) >> shift);
  }
 
  //*************************************************************************
  //*************************************************************************
  template <typename TInteger>
  typename etl::enable_if<etl::is_integral<TInteger>::value, etl::byte&>::type operator<<=(etl::byte& b, TInteger shift)
  {
    b = b << shift;
 
    return b;
  }
 
  //*************************************************************************
  //*************************************************************************
  template <typename TInteger>
  typename etl::enable_if<etl::is_integral<TInteger>::value, etl::byte&>::type operator>>=(etl::byte& b, TInteger shift)
  {
    b = b >> shift;
 
    return b;
  }
 
  //*************************************************************************
  //*************************************************************************
  inline etl::byte operator|(etl::byte lhs, etl::byte rhs)
  {
    return etl::byte(to_integer<unsigned int>(lhs) | to_integer<unsigned int>(rhs));
  }
 
  //*************************************************************************
  //*************************************************************************
  inline etl::byte operator&(etl::byte lhs, etl::byte rhs)
  {
    return etl::byte(to_integer<unsigned int>(lhs) & to_integer<unsigned int>(rhs));
  }
 
  //*************************************************************************
  //*************************************************************************
  inline etl::byte operator^(etl::byte lhs, etl::byte rhs)
  {
    return etl::byte(to_integer<unsigned int>(lhs) ^ to_integer<unsigned int>(rhs));
  }
 
  //*************************************************************************
  //*************************************************************************
  inline etl::byte& operator|=(etl::byte& lhs, etl::byte rhs)
  {
    return lhs = lhs | rhs;
  }
 
  //*************************************************************************
  //*************************************************************************
  inline etl::byte& operator&=(etl::byte& lhs, etl::byte rhs)
  {
    return lhs = lhs & rhs;
  }
 
  //*************************************************************************
  //*************************************************************************
  inline etl::byte& operator^=(etl::byte& lhs, etl::byte rhs)
  {
    return lhs = lhs ^ rhs;
  }
 
  //*************************************************************************
  //*************************************************************************
  inline etl::byte operator~(etl::byte b)
  {
    return etl::byte(~to_integer<unsigned char>(b));
  }
 
#endif
 
} // namespace etl
 
#endif