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
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
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furnished to do so, subject to the following conditions :
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
******************************************************************************/
 
#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) 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) 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) 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) 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) noexcept
  {
    return b = b >> shift;
  }
 
  //*************************************************************************
  //*************************************************************************
  inline constexpr etl::byte operator |(etl::byte lhs, etl::byte rhs) 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) 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) 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) noexcept
  {
    return lhs = lhs | rhs;
  }
 
  //*************************************************************************
  //*************************************************************************
  inline ETL_CONSTEXPR14 etl::byte& operator &=(etl::byte& lhs, etl::byte rhs) noexcept
  {
    return lhs = lhs & rhs;
  }
 
  //*************************************************************************
  //*************************************************************************
  inline ETL_CONSTEXPR14 etl::byte& operator ^=(etl::byte& lhs, etl::byte rhs) noexcept
  {
    return lhs = lhs ^ rhs;
  }
 
  //*************************************************************************
  //*************************************************************************
  inline constexpr etl::byte operator ~(etl::byte b) 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
 
 
}
 
#endif