/* boost integer_traits.hpp header file

 *

 * Copyright Jens Maurer 2000

 * Distributed under the Boost Software License, Version 1.0. (See

 * accompanying file LICENSE_1_0.txt or copy at

 * http://www.boost.org/LICENSE_1_0.txt)

 *

 * $Id: integer_traits.hpp 32576 2006-02-05 10:19:42Z johnmaddock $

 *

 * Idea by Beman Dawes, Ed Brey, Steve Cleary, and Nathan Myers

 */

//  See http://www.boost.org/libs/integer for documentation.

#ifndef BOOST_INTEGER_TRAITS_HPP

#define BOOST_INTEGER_TRAITS_HPP

#include <boost/config.hpp>

#include <boost/limits.hpp>

// These are an implementation detail and not part of the interface

#include <limits.h>

// we need wchar.h for WCHAR_MAX/MIN but not all platforms provide it,

// and some may have <wchar.h> but not <cwchar> ...

#if !defined(BOOST_NO_INTRINSIC_WCHAR_T) && (!defined(BOOST_NO_CWCHAR) || defined(sun) || defined(__sun) || defined(__QNX__))

#include <wchar.h>

#endif

namespace boost {

template<class T>

class integer_traits : public std::numeric_limits<T>

{

public:

  BOOST_STATIC_CONSTANT(bool, is_integral = false);

};

namespace detail {

template<class T, T min_val, T max_val>

class integer_traits_base

{

public:

  BOOST_STATIC_CONSTANT(bool, is_integral = true);

  BOOST_STATIC_CONSTANT(T, const_min = min_val);

  BOOST_STATIC_CONSTANT(T, const_max = max_val);

};

#ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION

//  A definition is required even for integral static constants

template<class T, T min_val, T max_val>

const bool integer_traits_base<T, min_val, max_val>::is_integral;

template<class T, T min_val, T max_val>

const T integer_traits_base<T, min_val, max_val>::const_min;

template<class T, T min_val, T max_val>

const T integer_traits_base<T, min_val, max_val>::const_max;

#endif

} // namespace detail

template<>

class integer_traits<bool>

  : public std::numeric_limits<bool>,

    public detail::integer_traits_base<bool, false, true>

{ };

template<>

class integer_traits<char>

  : public std::numeric_limits<char>,

    public detail::integer_traits_base<char, CHAR_MIN, CHAR_MAX>

{ };

template<>

class integer_traits<signed char>

  : public std::numeric_limits<signed char>,

    public detail::integer_traits_base<signed char, SCHAR_MIN, SCHAR_MAX>

{ };

template<>

class integer_traits<unsigned char>

  : public std::numeric_limits<unsigned char>,

    public detail::integer_traits_base<unsigned char, 0, UCHAR_MAX>

{ };

#ifndef BOOST_NO_INTRINSIC_WCHAR_T

template<>

class integer_traits<wchar_t>

  : public std::numeric_limits<wchar_t>,

    // Don't trust WCHAR_MIN and WCHAR_MAX with Mac OS X's native

    // library: they are wrong!

#if defined(WCHAR_MIN) && defined(WCHAR_MAX) && !defined(__APPLE__)

    public detail::integer_traits_base<wchar_t, WCHAR_MIN, WCHAR_MAX>

#elif defined(__BORLANDC__) || defined(__CYGWIN__) || defined(__MINGW32__) || (defined(__BEOS__) && defined(__GNUC__))

    // No WCHAR_MIN and WCHAR_MAX, whar_t is short and unsigned:

    public detail::integer_traits_base<wchar_t, 0, 0xffff>

#elif (defined(__sgi) && (!defined(__SGI_STL_PORT) || __SGI_STL_PORT < 0x400))\

    || (defined __APPLE__)\

    || (defined(__OpenBSD__) && defined(__GNUC__))\

    || (defined(__NetBSD__) && defined(__GNUC__))\

    || (defined(__FreeBSD__) && defined(__GNUC__))\

    || (defined(__DragonFly__) && defined(__GNUC__))\

    || (defined(__hpux) && defined(__GNUC__) && (__GNUC__ == 3) && !defined(__SGI_STL_PORT))

    // No WCHAR_MIN and WCHAR_MAX, wchar_t has the same range as int.

    //  - SGI MIPSpro with native library

    //  - gcc 3.x on HP-UX

    //  - Mac OS X with native library

    //  - gcc on FreeBSD, OpenBSD and NetBSD

    public detail::integer_traits_base<wchar_t, INT_MIN, INT_MAX>

#elif defined(__hpux) && defined(__GNUC__) && (__GNUC__ == 2) && !defined(__SGI_STL_PORT)

    // No WCHAR_MIN and WCHAR_MAX, wchar_t has the same range as unsigned int.

    //  - gcc 2.95.x on HP-UX

    // (also, std::numeric_limits<wchar_t> appears to return the wrong values).

    public detail::integer_traits_base<wchar_t, 0, UINT_MAX>

#else

#error No WCHAR_MIN and WCHAR_MAX present, please adjust integer_traits<> for your compiler.

#endif

{ };

#endif // BOOST_NO_INTRINSIC_WCHAR_T

template<>

class integer_traits<short>

  : public std::numeric_limits<short>,

    public detail::integer_traits_base<short, SHRT_MIN, SHRT_MAX>

{ };

template<>

class integer_traits<unsigned short>

  : public std::numeric_limits<unsigned short>,

    public detail::integer_traits_base<unsigned short, 0, USHRT_MAX>

{ };

template<>

class integer_traits<int>

  : public std::numeric_limits<int>,

    public detail::integer_traits_base<int, INT_MIN, INT_MAX>

{ };

template<>

class integer_traits<unsigned int>

  : public std::numeric_limits<unsigned int>,

    public detail::integer_traits_base<unsigned int, 0, UINT_MAX>

{ };

template<>

class integer_traits<long>

  : public std::numeric_limits<long>,

    public detail::integer_traits_base<long, LONG_MIN, LONG_MAX>

{ };

template<>

class integer_traits<unsigned long>

  : public std::numeric_limits<unsigned long>,

    public detail::integer_traits_base<unsigned long, 0, ULONG_MAX>

{ };

#if !defined(BOOST_NO_INTEGRAL_INT64_T) && !defined(BOOST_NO_INT64_T)

#if defined(ULLONG_MAX) && defined(BOOST_HAS_LONG_LONG)

template<>

class integer_traits< ::boost::long_long_type>

  : public std::numeric_limits< ::boost::long_long_type>,

    public detail::integer_traits_base< ::boost::long_long_type, LLONG_MIN, LLONG_MAX>

{ };

template<>

class integer_traits< ::boost::ulong_long_type>

  : public std::numeric_limits< ::boost::ulong_long_type>,

    public detail::integer_traits_base< ::boost::ulong_long_type, 0, ULLONG_MAX>

{ };

#elif defined(ULONG_LONG_MAX) && defined(BOOST_HAS_LONG_LONG)

template<>

class integer_traits< ::boost::long_long_type>  : public std::numeric_limits< ::boost::long_long_type>,    public detail::integer_traits_base< ::boost::long_long_type, LONG_LONG_MIN, LONG_LONG_MAX>{ };

template<>

class integer_traits< ::boost::ulong_long_type>

  : public std::numeric_limits< ::boost::ulong_long_type>,

    public detail::integer_traits_base< ::boost::ulong_long_type, 0, ULONG_LONG_MAX>

{ };

#elif defined(ULONGLONG_MAX) && defined(BOOST_HAS_LONG_LONG)

template<>

class integer_traits< ::boost::long_long_type>

  : public std::numeric_limits< ::boost::long_long_type>,

    public detail::integer_traits_base< ::boost::long_long_type, LONGLONG_MIN, LONGLONG_MAX>

{ };

template<>

class integer_traits< ::boost::ulong_long_type>

  : public std::numeric_limits< ::boost::ulong_long_type>,

    public detail::integer_traits_base< ::boost::ulong_long_type, 0, ULONGLONG_MAX>

{ };

#elif defined(_LLONG_MAX) && defined(_C2) && defined(BOOST_HAS_LONG_LONG)

template<>

class integer_traits< ::boost::long_long_type>

  : public std::numeric_limits< ::boost::long_long_type>,

    public detail::integer_traits_base< ::boost::long_long_type, -_LLONG_MAX - _C2, _LLONG_MAX>

{ };

template<>

class integer_traits< ::boost::ulong_long_type>

  : public std::numeric_limits< ::boost::ulong_long_type>,

    public detail::integer_traits_base< ::boost::ulong_long_type, 0, _ULLONG_MAX>

{ };

#elif defined(BOOST_HAS_LONG_LONG)

//

// we have long long but no constants, this happens for example with gcc in -ansi mode,

// we'll just have to work out the values for ourselves (assumes 2's compliment representation):

//

template<>

class integer_traits< ::boost::long_long_type>

  : public std::numeric_limits< ::boost::long_long_type>,

    public detail::integer_traits_base< ::boost::long_long_type, (1LL << (sizeof(::boost::long_long_type) - 1)), ~(1LL << (sizeof(::boost::long_long_type) - 1))>

{ };

template<>

class integer_traits< ::boost::ulong_long_type>

  : public std::numeric_limits< ::boost::ulong_long_type>,

    public detail::integer_traits_base< ::boost::ulong_long_type, 0, ~0uLL>

{ };

#endif

#endif

} // namespace boost

#endif /* BOOST_INTEGER_TRAITS_HPP */