integral_limits.h

///\file

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

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

Copyright(c) 2014 jwellbelove

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******************************************************************************/

#ifndef __ETL_INTEGRAL_LIMITS__
#define __ETL_INTEGRAL_LIMITS__

#include <climits>
#include <stddef.h>

#include "type_traits.h"

#if WIN32
#undef min
#undef max
#endif

//*****************************************************************************
///\defgroup integral_limits integral_limits
/// A set of templated compile time constants that mirror some of std::numeric_limits funtionality.
///\ingroup utilities
//*****************************************************************************

namespace etl
{
  //***************************************************************************
  ///\ingroup integral_limits
  //***************************************************************************
  template <typename T>
  struct integral_limits;

  //***************************************************************************
  ///\ingroup integral_limits
  //***************************************************************************
  template <>
  struct integral_limits<void>
  {
    static const int min        = 0;
    static const int max        = 0;
    static const int bits       = 0;
    static const bool is_signed = false;
  };

  //***************************************************************************
  ///\ingroup integral_limits
  //***************************************************************************
  template <>
  struct integral_limits<signed char>
  {
    static const signed char min = SCHAR_MIN;
    static const signed char max = SCHAR_MAX;
    static const int bits        = CHAR_BIT;
    static const bool is_signed  = etl::is_signed<signed char>::value;
  };

  //***************************************************************************
  ///\ingroup integral_limits
  //***************************************************************************
  template <>
  struct integral_limits<unsigned char>
  {
    static const unsigned char min = 0;
    static const unsigned char max = UCHAR_MAX;
    static const int bits          = CHAR_BIT;
    static const bool is_signed    = etl::is_signed<unsigned char>::value;
  };

  //***************************************************************************
  ///\ingroup integral_limits
  //***************************************************************************
  template <>
  struct integral_limits<char>
  {  
    static const char min       = (etl::is_signed<char>::value) ? SCHAR_MIN : 0;
    static const char max       = (etl::is_signed<char>::value) ? SCHAR_MAX : UCHAR_MAX;
    static const int bits       = CHAR_BIT;
    static const bool is_signed = etl::is_signed<char>::value;
  };

  //***************************************************************************
  ///\ingroup integral_limits
  //***************************************************************************
  template <>
  struct integral_limits<short>
  {
    static const short min      = SHRT_MIN;
    static const short max      = SHRT_MAX;
    static const int bits       = CHAR_BIT * (sizeof(short) / sizeof(char));
    static const bool is_signed = etl::is_signed<short>::value;
  };

  //***************************************************************************
  ///\ingroup integral_limits
  //***************************************************************************
  template <>
  struct integral_limits<unsigned short>
  {
    static const unsigned short min = 0;
    static const unsigned short max = USHRT_MAX;
    static const int bits           = CHAR_BIT * (sizeof(unsigned short) / sizeof(char));
    static const bool is_signed     = etl::is_signed<unsigned short>::value;
  };

  //***************************************************************************
  ///\ingroup integral_limits
  //***************************************************************************
  template <>
  struct integral_limits<int>
  {
    static const int min        = INT_MIN;
    static const int max        = INT_MAX;
    static const int bits       = CHAR_BIT * (sizeof(int) / sizeof(char));
    static const bool is_signed = etl::is_signed<int>::value;
  };

  //***************************************************************************
  ///\ingroup integral_limits
  //***************************************************************************
  template <>
  struct integral_limits<unsigned int>
  {
    static const unsigned int min = 0;
    static const unsigned int max = UINT_MAX;
    static const int bits         = CHAR_BIT * (sizeof(unsigned int) / sizeof(char));
    static const bool is_signed   = etl::is_signed<unsigned int>::value;
  };

  //***************************************************************************
  ///\ingroup integral_limits
  //***************************************************************************
  template <>
  struct integral_limits<long>
  {
    static const long min       = LONG_MIN;
    static const long max       = LONG_MAX;
    static const int bits       = CHAR_BIT * (sizeof(long) / sizeof(char));
    static const bool is_signed = etl::is_signed<long>::value;
  };

  //***************************************************************************
  ///\ingroup integral_limits
  //***************************************************************************
  template <>
  struct integral_limits<unsigned long>
  {
    static const unsigned long min = 0;
    static const unsigned long max = ULONG_MAX;
    static const int bits          = CHAR_BIT * (sizeof(unsigned long) / sizeof(char));
    static const bool is_signed    = etl::is_signed<unsigned long>::value;
  };

  //***************************************************************************
  ///\ingroup integral_limits
  //***************************************************************************
  template <>
  struct integral_limits<long long>
  {
    static const long long min  = LLONG_MIN;
    static const long long max  = LLONG_MAX;
    static const int bits       = CHAR_BIT * (sizeof(long long) / sizeof(char));
    static const bool is_signed = etl::is_signed<long long>::value;
  };

  //***************************************************************************
  ///\ingroup integral_limits
  //***************************************************************************
  template <>
  struct integral_limits<unsigned long long>
  {
    static const unsigned long long min = 0;
    static const unsigned long long max = ULLONG_MAX;
    static const int bits               = CHAR_BIT * (sizeof(unsigned long long) / sizeof(char));
    static const bool is_signed         = etl::is_signed<unsigned long long>::value;
  };
}

#if WIN32
#define min(a,b) (((a) < (b)) ? (a) : (b))
#define max(a,b) (((a) > (b)) ? (a) : (b))
#endif

#endif