fsfw/contrib/fsfw_contrib/etl-20.39.4/include/etl/compare.h

///\file

/******************************************************************************
The MIT License(MIT)

Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com

Copyright(c) 2017 John Wellbelove

Permission is hereby granted, free of charge, to any person obtaining a copy
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******************************************************************************/

#ifndef ETL_COMPARE_INCLUDED
#define ETL_COMPARE_INCLUDED

#include "platform.h"
#include "parameter_type.h"
#include "functional.h"

//*****************************************************************************
///\defgroup compare compare
/// Comparisons only using less than operator
///\ingroup utilities
//*****************************************************************************
namespace etl
{
  //***************************************************************************
  /// Defines <=, >, >=, ==, !=, <=> in terms of <
  /// Default implementation of TLess is etl::less
  //***************************************************************************
  template <typename T, typename TLess = etl::less<T> >
  struct compare
  {
    enum cmp_result
    {
      Less    = -1,
      Equal   = 0,
      Greater = 1
    };

    typedef typename etl::parameter_type<T>::type first_argument_type;
    typedef typename etl::parameter_type<T>::type second_argument_type;

    static ETL_CONSTEXPR bool lt(first_argument_type lhs, second_argument_type rhs)
    {
      return TLess()(lhs, rhs);
    }

    static ETL_CONSTEXPR bool gt(first_argument_type lhs, second_argument_type rhs)
    {
      return TLess()(rhs, lhs);
    }

    static ETL_CONSTEXPR bool lte(first_argument_type lhs, second_argument_type rhs)
    {
      return !gt(lhs, rhs);
    }

    static ETL_CONSTEXPR bool gte(first_argument_type lhs, second_argument_type rhs)
    {
      return !lt(lhs, rhs);
    }

    static ETL_CONSTEXPR bool eq(first_argument_type lhs, second_argument_type rhs)
    {
      return gte(lhs, rhs) && lte(lhs, rhs);
    }

    static ETL_CONSTEXPR bool ne(first_argument_type lhs, second_argument_type rhs)
    {
      return !eq(lhs, rhs);
    }

    static ETL_CONSTEXPR cmp_result cmp(first_argument_type lhs, second_argument_type rhs)
    {
      return lt(lhs, rhs) ? Less : gt(lhs, rhs) ? Greater : Equal;
    }
  };

  //***************************************************************************
  /// Default implementation of TLess is etl::less
  //***************************************************************************
#if ETL_USING_CPP11
  template <typename T, typename TLess = etl::less<T> >
#else
  template <typename T, typename TLess>
#endif
  ETL_CONSTEXPR14 int three_way_compare(const T& lhs, const T& rhs)
  {
    return etl::compare<T>::cmp(lhs, rhs);
  }
}

#endif