limits.hh

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// limits.hh: this file is part of the Vaucanson project.
//
// Vaucanson, a generic library for finite state machines.
//
// Copyright (C) 2001, 2002, 2003, 2004, 2005 The Vaucanson Group.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// The complete GNU General Public Licence Notice can be found as the
// `COPYING' file in the root directory.
//
// The Vaucanson Group consists of people listed in the `AUTHORS' file.
//
#ifndef VCSN_MISC_LIMITS_HH
# define VCSN_MISC_LIMITS_HH

# include <vaucanson/config/math.hh>

# ifdef USE_C_LIMITS
#  include <climits>
# else
#  include <limits>
# endif

namespace utility
{
  template<typename T>
  struct limits
# ifndef USE_C_LIMITS
    : std::numeric_limits<T>
  { };
# else
  {
    static const bool is_specialized = false;
  };

  template<>
  struct limits<bool>
  {
    static const int digits = sizeof(bool)*8;
    static const int digits10 = 1;
    static const bool is_specialized = true;
    static bool min() throw() { return false; }
    static bool max() throw() { return false; }
    static const bool has_infinity = false;
    static bool infinity() throw() { return false; }
    static const bool has_quiet_NaN = false;
    static bool quiet_NaN() throw()
    { return static_cast<bool>(0); }
    static const bool is_signed = false;
    static const bool is_integer = true;
    static const bool is_exact = true;
    static const int radix = 2;
    static const bool is_iec559 = true;
    static const bool is_bounded = true;
    static const bool is_modulo = true;
  };

  template<>
  struct limits<signed char>
  {
    static const int digits = sizeof(signed char)*8 - 1;
    static const int digits10 = 3;
    static const bool is_specialized = true;
    static signed char min() throw()   { return SCHAR_MIN; }
    static signed char max() throw() { return SCHAR_MAX; }
    static const bool is_signed = true;
    static const bool is_integer = true;
    static const bool is_exact = true;
    static const int radix = 2;
    static const bool has_infinity = false;
    static signed char infinity() throw()
    { return static_cast<signed char>(0); }
    static const bool has_quiet_NaN = false;
    static signed char quiet_NaN() throw()
    { return static_cast<signed char>(0); }
    static const bool is_iec559 = false;
    static const bool is_bounded = true;
    static const bool is_modulo = false;
  };

  template<>
  struct limits<unsigned char>
  {
    static const int digits = sizeof(unsigned char)*8;
    static const int digits10 = 3;
    static const bool is_specialized = true;
    static unsigned char min() throw()   { return 0; }
    static unsigned char max() throw() { return UCHAR_MAX; }
    static const bool is_signed = false;
    static const bool is_integer = true;
    static const bool is_exact = true;
    static const int radix = 2;
    static const bool has_infinity = false;
    static unsigned char infinity() throw()
    { return static_cast<unsigned char>(0); }
    static const bool has_quiet_NaN = false;
    static unsigned char quiet_NaN() throw()
    { return static_cast<unsigned char>(0); }
    static const bool is_iec559 = false;
    static const bool is_bounded = true;
    static const bool is_modulo = true;
  };

  template<>
  struct limits<int>
  {
    static const int digits = sizeof(int)*8 - 1;
    static const int digits10 = 19;
    static const bool is_specialized = true;
    static int min() throw()   { return INT_MIN; }
    static int max() throw() { return INT_MAX; }
    static const bool is_signed = true;
    static const bool is_integer = true;
    static const bool is_exact = true;
    static const int radix = 2;
    static const bool has_infinity = false;
    static int infinity() throw()
    { return static_cast<int>(0); }
    static const bool has_quiet_NaN = false;
    static int quiet_NaN() throw()
    { return static_cast<int>(0); }
    static const bool is_iec559 = true;
    static const bool is_bounded = true;
    static const bool is_modulo = false;
  };

  template<>
  struct limits<unsigned int>
  {
    static const int digits = sizeof(unsigned int)*8;
    static const int digits10 = 19;
    static const bool is_specialized = true;
    static unsigned int min() throw()   { return 0; }
    static unsigned int max() throw() { return UINT_MAX; }
    static const bool is_signed = false;
    static const bool is_integer = true;
    static const bool is_exact = true;
    static const int radix = 2;
    static const bool has_infinity = false;
    static unsigned int infinity() throw()
    { return static_cast<unsigned int>(0); }
    static const bool has_quiet_NaN = false;
    static unsigned int quiet_NaN() throw()
    { return static_cast<unsigned int>(0); }
    static const bool is_iec559 = true;
    static const bool is_bounded = true;
    static const bool is_modulo = true;
  };

  template<>
  struct limits<float>
  {
    static const int digits = sizeof(float)*8;
    static const int digits10 = 33;
    static const bool is_specialized = true;
    static float min() throw()   { return -HUGE_VAL; }
    static float max() throw() { return HUGE_VAL; }
    static const bool is_signed = true;
    static const bool is_integer = false;
    static const bool is_exact = false;
    static const int radix = 2;
    static const bool has_infinity = true;
    static float infinity() throw()
    { return HUGE_VAL; }
    static const bool has_quiet_NaN = true;
    static float quiet_NaN() throw()
    { return NAN; }
    static const bool is_iec559 = false;
    static const bool is_bounded = false;
    static const bool is_modulo = false;
  };

  template<>
  struct limits<double>
  {
    static const int digits = sizeof(float)*8;
    static const int digits10 = 33;
    static const bool is_specialized = true;
    static float min() throw()   { return -HUGE_VAL; }
    static float max() throw() { return HUGE_VAL; }
    static const bool is_signed = true;
    static const bool is_integer = false;
    static const bool is_exact = false;
    static const int radix = 2;
    static const bool has_infinity = true;
    static float infinity() throw()
    { return HUGE_VAL; }
    static const bool has_quiet_NaN = true;
    static float quiet_NaN() throw()
    { return NAN; }
    static const bool is_iec559 = false;
    static const bool is_bounded = false;
    static const bool is_modulo = false;
  };

# endif

}


#endif // ! VCSN_MISC_LIMITS_HH

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