imgtools/imglib/boostlibrary/boost/detail/limits.hpp
author jjkang
Wed, 23 Jun 2010 16:56:47 +0800
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buildrom v3.24.0, rombuild v2.17.3, rofsbuild v2.10.4, resource compiler v8.4.001, image check v1.4.0, elftools v2.3, elf2e32 v2.3
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// Copyright 2001 John Maddock
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// Distributed under the Boost Software License, Version 1.0. (See accompany-
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// ing file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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/*
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 * Copyright (c) 1997
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 * Silicon Graphics Computer Systems, Inc.
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 *
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 * Permission to use, copy, modify, distribute and sell this software
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 * and its documentation for any purpose is hereby granted without fee,
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 * provided that the above copyright notice appear in all copies and
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 * that both that copyright notice and this permission notice appear
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 * in supporting documentation.  Silicon Graphics makes no
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 * representations about the suitability of this software for any
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 * purpose.  It is provided "as is" without express or implied warranty.
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 */
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/* NOTE: This is not portable code.  Parts of numeric_limits<> are
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 * inherently machine-dependent, and this file is written for the MIPS
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 * architecture and the SGI MIPSpro C++ compiler.  Parts of it (in
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 * particular, some of the characteristics of floating-point types)
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 * are almost certainly incorrect for any other platform.
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 */
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/* The above comment is almost certainly out of date. This file works
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 * on systems other than SGI MIPSpro C++ now.
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 */
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/*
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 * Revision history:
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 * 21 Sep 2001:
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 *    Only include <cwchar> if BOOST_NO_CWCHAR is defined. (Darin Adler)
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 * 10 Aug 2001:
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 *    Added MIPS (big endian) to the big endian family. (Jens Maurer)
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 * 13 Apr 2001:
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 *    Added powerpc to the big endian family. (Jeremy Siek)
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 * 5 Apr 2001:
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 *    Added sparc (big endian) processor support (John Maddock).
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 * Initial sub:
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 *      Modified by Jens Maurer for gcc 2.95 on x86.
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 */
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#ifndef BOOST_SGI_CPP_LIMITS
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#define BOOST_SGI_CPP_LIMITS
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#include <climits>
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#include <cfloat>
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#include <boost/config.hpp>
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#include <boost/detail/endian.hpp>
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#ifndef BOOST_NO_CWCHAR
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#include <cwchar> // for WCHAR_MIN and WCHAR_MAX
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#endif
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namespace std {
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enum float_round_style {
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  round_indeterminate       = -1,
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  round_toward_zero         =  0,
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  round_to_nearest          =  1,
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  round_toward_infinity     =  2,
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  round_toward_neg_infinity =  3
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};
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enum float_denorm_style {
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  denorm_indeterminate = -1,
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  denorm_absent        =  0,
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  denorm_present       =  1
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};
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// The C++ standard (section 18.2.1) requires that some of the members of
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// numeric_limits be static const data members that are given constant-
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// initializers within the class declaration.  On compilers where the
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// BOOST_NO_INCLASS_MEMBER_INITIALIZATION macro is defined, it is impossible to write
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// a standard-conforming numeric_limits class.
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//
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// There are two possible workarounds: either initialize the data
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// members outside the class, or change them from data members to
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// enums.  Neither workaround is satisfactory: the former makes it
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// impossible to use the data members in constant-expressions, and the
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// latter means they have the wrong type and that it is impossible to
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// take their addresses.  We choose the former workaround.
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#ifdef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
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# define BOOST_STL_DECLARE_LIMITS_MEMBER(__mem_type, __mem_name, __mem_value) \
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  enum { __mem_name = __mem_value }
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#else /* BOOST_NO_INCLASS_MEMBER_INITIALIZATION */
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# define BOOST_STL_DECLARE_LIMITS_MEMBER(__mem_type, __mem_name, __mem_value) \
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  static const __mem_type __mem_name = __mem_value
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#endif /* BOOST_NO_INCLASS_MEMBER_INITIALIZATION */
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// Base class for all specializations of numeric_limits.
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template <class __number>
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class _Numeric_limits_base {
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public:
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_specialized, false);
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  static __number min BOOST_PREVENT_MACRO_SUBSTITUTION () throw() { return __number(); }
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  static __number max BOOST_PREVENT_MACRO_SUBSTITUTION () throw() { return __number(); }
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  BOOST_STL_DECLARE_LIMITS_MEMBER(int, digits,   0);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(int, digits10, 0);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_signed,  false);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_integer, false);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_exact,   false);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(int, radix, 0);
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  static __number epsilon() throw()     { return __number(); }
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  static __number round_error() throw() { return __number(); }
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  BOOST_STL_DECLARE_LIMITS_MEMBER(int, min_exponent,   0);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(int, min_exponent10, 0);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(int, max_exponent,   0);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(int, max_exponent10, 0);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, has_infinity,      false);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, has_quiet_NaN,     false);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, has_signaling_NaN, false);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(float_denorm_style,
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                              has_denorm,
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                              denorm_absent);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, has_denorm_loss,   false);
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  static __number infinity() throw()      { return __number(); }
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  static __number quiet_NaN() throw()     { return __number(); }
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  static __number signaling_NaN() throw() { return __number(); }
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  static __number denorm_min() throw()    { return __number(); }
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_iec559,  false);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_bounded, false);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_modulo,  false);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, traps,            false);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, tinyness_before,  false);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(float_round_style,
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                              round_style,
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                              round_toward_zero);
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};
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// Base class for integers.
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template <class _Int,
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          _Int __imin,
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          _Int __imax,
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          int __idigits = -1>
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class _Integer_limits : public _Numeric_limits_base<_Int> 
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{
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public:
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_specialized, true);
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  static _Int min BOOST_PREVENT_MACRO_SUBSTITUTION () throw() { return __imin; }
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  static _Int max BOOST_PREVENT_MACRO_SUBSTITUTION () throw() { return __imax; }
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  BOOST_STL_DECLARE_LIMITS_MEMBER(int,
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                              digits,
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                              (__idigits < 0) ? (int)(sizeof(_Int) * CHAR_BIT)
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                                                   - (__imin == 0 ? 0 : 1) 
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                                              : __idigits);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(int, digits10, (digits * 301) / 1000); 
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                                // log 2 = 0.301029995664...
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_signed,  __imin != 0);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_integer, true);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_exact,   true);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(int,  radix,      2);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_bounded, true);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_modulo, true);
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};
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#if defined(BOOST_BIG_ENDIAN)
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 template<class Number, unsigned int Word>
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 struct float_helper{
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  static Number get_word() throw() {
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    // sizeof(long double) == 16
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    const unsigned int _S_word[4] = { Word, 0, 0, 0 };
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    return *reinterpret_cast<const Number*>(&_S_word);
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  } 
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};
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#else
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 template<class Number, unsigned int Word>
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 struct float_helper{
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  static Number get_word() throw() {
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    // sizeof(long double) == 12, but only 10 bytes significant
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    const unsigned int _S_word[4] = { 0, 0, 0, Word };
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    return *reinterpret_cast<const Number*>(
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        reinterpret_cast<const char *>(&_S_word)+16-
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                (sizeof(Number) == 12 ? 10 : sizeof(Number)));
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  } 
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};
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#endif
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// Base class for floating-point numbers.
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template <class __number,
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         int __Digits, int __Digits10,
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         int __MinExp, int __MaxExp,
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         int __MinExp10, int __MaxExp10,
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         unsigned int __InfinityWord,
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         unsigned int __QNaNWord, unsigned int __SNaNWord,
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         bool __IsIEC559,
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         float_round_style __RoundStyle>
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class _Floating_limits : public _Numeric_limits_base<__number>
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{
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public:
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_specialized, true);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(int, digits,   __Digits);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(int, digits10, __Digits10);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_signed, true);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(int, radix, 2);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(int, min_exponent,   __MinExp);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(int, max_exponent,   __MaxExp);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(int, min_exponent10, __MinExp10);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(int, max_exponent10, __MaxExp10);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, has_infinity,      true);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, has_quiet_NaN,     true);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, has_signaling_NaN, true);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(float_denorm_style,
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                              has_denorm,
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                              denorm_indeterminate);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, has_denorm_loss,   false);
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  static __number infinity() throw() {
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    return float_helper<__number, __InfinityWord>::get_word();
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  }
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  static __number quiet_NaN() throw() {
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    return float_helper<__number,__QNaNWord>::get_word();
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  }
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  static __number signaling_NaN() throw() {
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    return float_helper<__number,__SNaNWord>::get_word();
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  }
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_iec559,       __IsIEC559);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_bounded,      true);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, traps,           false /* was: true */ );
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  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, tinyness_before, false);
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  BOOST_STL_DECLARE_LIMITS_MEMBER(float_round_style, round_style, __RoundStyle);
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};
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// Class numeric_limits
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// The unspecialized class.
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template<class T> 
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class numeric_limits : public _Numeric_limits_base<T> {};
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// Specializations for all built-in integral types.
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template<>
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class numeric_limits<bool>
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  : public _Integer_limits<bool, false, true, 0>
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{};
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template<>
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class numeric_limits<char>
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  : public _Integer_limits<char, CHAR_MIN, CHAR_MAX>
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{};
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template<>
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class numeric_limits<signed char>
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  : public _Integer_limits<signed char, SCHAR_MIN, SCHAR_MAX>
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{};
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template<>
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class numeric_limits<unsigned char>
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  : public _Integer_limits<unsigned char, 0, UCHAR_MAX>
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{};
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#ifndef BOOST_NO_INTRINSIC_WCHAR_T
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template<>
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class numeric_limits<wchar_t>
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#if !defined(WCHAR_MAX) || !defined(WCHAR_MIN)
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#if defined(_WIN32) || defined(__CYGWIN__)
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  : public _Integer_limits<wchar_t, 0, USHRT_MAX>
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#elif defined(__hppa)
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// wchar_t has "unsigned int" as the underlying type
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  : public _Integer_limits<wchar_t, 0, UINT_MAX>
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#else
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// assume that wchar_t has "int" as the underlying type
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  : public _Integer_limits<wchar_t, INT_MIN, INT_MAX>
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#endif
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#else
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// we have WCHAR_MIN and WCHAR_MAX defined, so use it
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  : public _Integer_limits<wchar_t, WCHAR_MIN, WCHAR_MAX>
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#endif
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{};
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#endif
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template<>
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class numeric_limits<short>
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  : public _Integer_limits<short, SHRT_MIN, SHRT_MAX>
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{};
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template<>
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class numeric_limits<unsigned short>
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  : public _Integer_limits<unsigned short, 0, USHRT_MAX>
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{};
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template<>
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class numeric_limits<int>
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  : public _Integer_limits<int, INT_MIN, INT_MAX>
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{};
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template<>
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class numeric_limits<unsigned int>
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  : public _Integer_limits<unsigned int, 0, UINT_MAX>
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{};
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template<>
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class numeric_limits<long>
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  : public _Integer_limits<long, LONG_MIN, LONG_MAX>
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{};
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template<>
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class numeric_limits<unsigned long>
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  : public _Integer_limits<unsigned long, 0, ULONG_MAX>
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{};
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   330
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#ifdef __GNUC__
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// Some compilers have long long, but don't define the
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   334
// LONGLONG_MIN and LONGLONG_MAX macros in limits.h.  This
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// assumes that long long is 64 bits.
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#if !defined(LONGLONG_MAX) && !defined(ULONGLONG_MAX)
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# define ULONGLONG_MAX 0xffffffffffffffffLLU
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# define LONGLONG_MAX 0x7fffffffffffffffLL
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   341
#endif
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   342
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   343
#if !defined(LONGLONG_MIN)
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# define LONGLONG_MIN (-LONGLONG_MAX - 1)
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#endif 
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   347
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   348
#if !defined(ULONGLONG_MIN)
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# define ULONGLONG_MIN 0
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#endif 
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#endif /* __GNUC__ */
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// Specializations for all built-in floating-point type.
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template<> class numeric_limits<float>
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  : public _Floating_limits<float, 
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                            FLT_MANT_DIG,   // Binary digits of precision
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                            FLT_DIG,        // Decimal digits of precision
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                            FLT_MIN_EXP,    // Minimum exponent
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                            FLT_MAX_EXP,    // Maximum exponent
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                            FLT_MIN_10_EXP, // Minimum base 10 exponent
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   363
                            FLT_MAX_10_EXP, // Maximum base 10 exponent
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   364
#if defined(BOOST_BIG_ENDIAN)
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                            0x7f80 << (sizeof(int)*CHAR_BIT-16),    // Last word of +infinity
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                            0x7f81 << (sizeof(int)*CHAR_BIT-16),    // Last word of quiet NaN
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                            0x7fc1 << (sizeof(int)*CHAR_BIT-16),    // Last word of signaling NaN
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#else
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                            0x7f800000u,    // Last word of +infinity
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                            0x7f810000u,    // Last word of quiet NaN
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   371
                            0x7fc10000u,    // Last word of signaling NaN
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   372
#endif
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                            true,           // conforms to iec559
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                            round_to_nearest>
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{
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public:
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   377
  static float min BOOST_PREVENT_MACRO_SUBSTITUTION () throw() { return FLT_MIN; }
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  static float denorm_min() throw() { return FLT_MIN; }
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  static float max BOOST_PREVENT_MACRO_SUBSTITUTION () throw() { return FLT_MAX; }
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  static float epsilon() throw() { return FLT_EPSILON; }
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   381
  static float round_error() throw() { return 0.5f; } // Units: ulps.
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   382
};
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   383
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   384
template<> class numeric_limits<double>
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   385
  : public _Floating_limits<double, 
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   386
                            DBL_MANT_DIG,   // Binary digits of precision
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   387
                            DBL_DIG,        // Decimal digits of precision
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   388
                            DBL_MIN_EXP,    // Minimum exponent
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   389
                            DBL_MAX_EXP,    // Maximum exponent
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   390
                            DBL_MIN_10_EXP, // Minimum base 10 exponent
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   391
                            DBL_MAX_10_EXP, // Maximum base 10 exponent
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   392
#if defined(BOOST_BIG_ENDIAN)
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                            0x7ff0 << (sizeof(int)*CHAR_BIT-16),    // Last word of +infinity
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   394
                            0x7ff1 << (sizeof(int)*CHAR_BIT-16),    // Last word of quiet NaN
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   395
                            0x7ff9 << (sizeof(int)*CHAR_BIT-16),    // Last word of signaling NaN
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diff changeset
   396
#else
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   397
                            0x7ff00000u,    // Last word of +infinity
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   398
                            0x7ff10000u,    // Last word of quiet NaN
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diff changeset
   399
                            0x7ff90000u,    // Last word of signaling NaN
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   400
#endif
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   401
                            true,           // conforms to iec559
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diff changeset
   402
                            round_to_nearest>
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diff changeset
   403
{
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diff changeset
   404
public:
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diff changeset
   405
  static double min BOOST_PREVENT_MACRO_SUBSTITUTION () throw() { return DBL_MIN; }
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diff changeset
   406
  static double denorm_min() throw() { return DBL_MIN; }
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diff changeset
   407
  static double max BOOST_PREVENT_MACRO_SUBSTITUTION () throw() { return DBL_MAX; }
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diff changeset
   408
  static double epsilon() throw() { return DBL_EPSILON; }
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diff changeset
   409
  static double round_error() throw() { return 0.5; } // Units: ulps.
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diff changeset
   410
};
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diff changeset
   411
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diff changeset
   412
template<> class numeric_limits<long double>
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diff changeset
   413
  : public _Floating_limits<long double, 
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diff changeset
   414
                            LDBL_MANT_DIG,  // Binary digits of precision
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diff changeset
   415
                            LDBL_DIG,       // Decimal digits of precision
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diff changeset
   416
                            LDBL_MIN_EXP,   // Minimum exponent
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diff changeset
   417
                            LDBL_MAX_EXP,   // Maximum exponent
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diff changeset
   418
                            LDBL_MIN_10_EXP,// Minimum base 10 exponent
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diff changeset
   419
                            LDBL_MAX_10_EXP,// Maximum base 10 exponent
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diff changeset
   420
#if defined(BOOST_BIG_ENDIAN)
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diff changeset
   421
                            0x7ff0 << (sizeof(int)*CHAR_BIT-16),    // Last word of +infinity
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diff changeset
   422
                            0x7ff1 << (sizeof(int)*CHAR_BIT-16),    // Last word of quiet NaN
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diff changeset
   423
                            0x7ff9 << (sizeof(int)*CHAR_BIT-16),    // Last word of signaling NaN
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diff changeset
   424
#else
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                            0x7fff8000u,    // Last word of +infinity
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                            0x7fffc000u,    // Last word of quiet NaN
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                            0x7fff9000u,    // Last word of signaling NaN
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#endif
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                            false,          // Doesn't conform to iec559
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                            round_to_nearest>
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{
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public:
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  static long double min BOOST_PREVENT_MACRO_SUBSTITUTION () throw() { return LDBL_MIN; }
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  static long double denorm_min() throw() { return LDBL_MIN; }
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  static long double max BOOST_PREVENT_MACRO_SUBSTITUTION () throw() { return LDBL_MAX; }
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  static long double epsilon() throw() { return LDBL_EPSILON; }
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  static long double round_error() throw() { return 4; } // Units: ulps.
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};
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} // namespace std
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#endif /* BOOST_SGI_CPP_LIMITS */
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// Local Variables:
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// mode:C++
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// End:
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   449