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414 lines
14 KiB
Plaintext
414 lines
14 KiB
Plaintext
/*
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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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#ifndef __SGI_CPP_LIMITS
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#define __SGI_CPP_LIMITS
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#include <limits.h>
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#include <float.h>
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#include <stl_config.h>
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__STL_BEGIN_NAMESPACE
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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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// 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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static const bool is_specialized = false;
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static __number min() __STL_NOTHROW { return __number(); }
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static __number max() __STL_NOTHROW { return __number(); }
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static const int digits = 0;
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static const int digits10 = 0;
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static const bool is_signed = false;
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static const bool is_integer = false;
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static const bool is_exact = false;
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static const int radix = 0;
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static __number epsilon() __STL_NOTHROW { return __number(); }
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static __number round_error() __STL_NOTHROW { return __number(); }
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static const int min_exponent = 0;
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static const int min_exponent10 = 0;
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static const int max_exponent = 0;
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static const int max_exponent10 = 0;
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static const bool has_infinity = false;
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static const bool has_quiet_NaN = false;
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static const bool has_signaling_NaN = false;
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static const float_denorm_style has_denorm = denorm_absent;
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static const bool has_denorm_loss = false;
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static __number infinity() __STL_NOTHROW { return __number(); }
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static __number quiet_NaN() __STL_NOTHROW { return __number(); }
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static __number signaling_NaN() __STL_NOTHROW { return __number(); }
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static __number denorm_min() __STL_NOTHROW { return __number(); }
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static const bool is_iec559 = false;
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static const bool is_bounded = false;
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static const bool is_modulo = false;
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static const bool traps = false;
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static const bool tinyness_before = false;
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static const float_round_style round_style = round_toward_zero;
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};
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#define __declare_numeric_base_member(__type, __mem) \
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template <class __number> \
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const __type _Numeric_limits_base<__number>:: __mem
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__declare_numeric_base_member(bool, is_specialized);
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__declare_numeric_base_member(int, digits);
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__declare_numeric_base_member(int, digits10);
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__declare_numeric_base_member(bool, is_signed);
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__declare_numeric_base_member(bool, is_integer);
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__declare_numeric_base_member(bool, is_exact);
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__declare_numeric_base_member(int, radix);
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__declare_numeric_base_member(int, min_exponent);
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__declare_numeric_base_member(int, max_exponent);
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__declare_numeric_base_member(int, min_exponent10);
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__declare_numeric_base_member(int, max_exponent10);
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__declare_numeric_base_member(bool, has_infinity);
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__declare_numeric_base_member(bool, has_quiet_NaN);
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__declare_numeric_base_member(bool, has_signaling_NaN);
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__declare_numeric_base_member(float_denorm_style, has_denorm);
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__declare_numeric_base_member(bool, has_denorm_loss);
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__declare_numeric_base_member(bool, is_iec559);
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__declare_numeric_base_member(bool, is_bounded);
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__declare_numeric_base_member(bool, is_modulo);
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__declare_numeric_base_member(bool, traps);
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__declare_numeric_base_member(bool, tinyness_before);
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__declare_numeric_base_member(float_round_style, round_style);
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#undef __declare_numeric_base_member
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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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static const bool is_specialized = true;
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static _Int min() __STL_NOTHROW { return __imin; }
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static _Int max() __STL_NOTHROW { return __imax; }
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static const int digits =
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(__idigits < 0) ? sizeof(_Int) * CHAR_BIT - (__imin == 0 ? 0 : 1)
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: __idigits;
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static const int digits10 = (digits * 301) / 1000;
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// log 2 = 0.301029995664...
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static const bool is_signed = __imin != 0;
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static const bool is_integer = true;
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static const bool is_exact = true;
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static const int radix = 2;
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static const bool is_bounded = true;
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static const bool is_modulo = true;
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};
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#define __declare_integer_limits_member(__type, __mem) \
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template <class _Int, _Int __imin, _Int __imax, int __idigits> \
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const __type _Integer_limits<_Int, __imin, __imax, __idigits>:: __mem
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__declare_integer_limits_member(bool, is_specialized);
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__declare_integer_limits_member(int, digits);
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__declare_integer_limits_member(int, digits10);
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__declare_integer_limits_member(bool, is_signed);
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__declare_integer_limits_member(bool, is_integer);
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__declare_integer_limits_member(bool, is_exact);
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__declare_integer_limits_member(int, radix);
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__declare_integer_limits_member(bool, is_bounded);
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__declare_integer_limits_member(bool, is_modulo);
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#undef __declare_integer_limits_member
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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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static const bool is_specialized = true;
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static const int digits = __Digits;
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static const int digits10 = __Digits10;
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static const bool is_signed = true;
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static const int radix = 2;
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static const int min_exponent = __MinExp;
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static const int max_exponent = __MaxExp;
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static const int min_exponent10 = __MinExp10;
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static const int max_exponent10 = __MaxExp10;
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static const bool has_infinity = true;
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static const bool has_quiet_NaN = true;
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static const bool has_signaling_NaN = true;
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static const float_denorm_style has_denorm = denorm_indeterminate;
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static const bool has_denorm_loss = false;
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static __number infinity() __STL_NOTHROW {
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static unsigned int _S_inf[sizeof(__number) / sizeof(int)] =
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{ __InfinityWord };
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return *reinterpret_cast<__number*>(&_S_inf);
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}
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static __number quiet_NaN() __STL_NOTHROW {
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static unsigned int _S_nan[sizeof(__number) / sizeof(int)] =
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{ __QNaNWord };
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return *reinterpret_cast<__number*>(&_S_nan);
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}
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static __number signaling_NaN() __STL_NOTHROW {
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static unsigned int _S_nan[sizeof(__number) / sizeof(int)] =
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{ __SNaNWord };
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return *reinterpret_cast<__number*>(&_S_nan);
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}
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static const bool is_iec559 = __IsIEC559;
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static const bool is_bounded = true;
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static const bool traps = true;
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static const bool tinyness_before = false;
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static const float_round_style round_style = __RoundStyle;
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};
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#define __declare_float_limits_member(__type, __mem) \
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template <class __Num, int __Dig, int __Dig10, \
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int __MnX, int __MxX, int __MnX10, int __MxX10, \
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unsigned int __Inf, unsigned int __QNaN, unsigned int __SNaN, \
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bool __IsIEEE, float_round_style __Sty> \
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const __type _Floating_limits<__Num, __Dig, __Dig10, \
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__MnX, __MxX, __MnX10, __MxX10, \
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__Inf, __QNaN, __SNaN,__IsIEEE, __Sty>:: __mem
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__declare_float_limits_member(bool, is_specialized);
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__declare_float_limits_member(int, digits);
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__declare_float_limits_member(int, digits10);
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__declare_float_limits_member(bool, is_signed);
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__declare_float_limits_member(int, radix);
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__declare_float_limits_member(int, min_exponent);
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__declare_float_limits_member(int, max_exponent);
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__declare_float_limits_member(int, min_exponent10);
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__declare_float_limits_member(int, max_exponent10);
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__declare_float_limits_member(bool, has_infinity);
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__declare_float_limits_member(bool, has_quiet_NaN);
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__declare_float_limits_member(bool, has_signaling_NaN);
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__declare_float_limits_member(float_denorm_style, has_denorm);
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__declare_float_limits_member(bool, has_denorm_loss);
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__declare_float_limits_member(bool, is_iec559);
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__declare_float_limits_member(bool, is_bounded);
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__declare_float_limits_member(bool, traps);
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__declare_float_limits_member(bool, tinyness_before);
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__declare_float_limits_member(float_round_style, round_style);
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#undef __declare_float_limits_member
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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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#ifndef __STL_NO_BOOL
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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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#endif /* __STL_NO_BOOL */
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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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#ifdef __STL_HAS_WCHAR_T
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template<>
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class numeric_limits<wchar_t>
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: public _Integer_limits<wchar_t, INT_MIN, INT_MAX>
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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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#ifdef __STL_LONG_LONG
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template<>
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class numeric_limits<long long>
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: public _Integer_limits<long long, LONGLONG_MIN, LONGLONG_MAX>
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{};
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template<>
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class numeric_limits<unsigned long long>
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: public _Integer_limits<unsigned long long, 0, ULONGLONG_MAX>
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{};
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#endif /* __STL_LONG_LONG */
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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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FLT_MAX_10_EXP, // Maximum base 10 exponent
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0x7f800000u, // First word of +infinity
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0x7f810000u, // First word of quiet NaN
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0x7fc10000u, // First word of signaling NaN
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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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static float min() __STL_NOTHROW { return FLT_MIN; }
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static float denorm_min() __STL_NOTHROW { return FLT_MIN; }
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static float max() __STL_NOTHROW { return FLT_MAX; }
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static float epsilon() __STL_NOTHROW { return FLT_EPSILON; }
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static float round_error() __STL_NOTHROW { return 0.5f; } // Units: ulps.
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};
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template<> class numeric_limits<double>
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: public _Floating_limits<double,
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DBL_MANT_DIG, // Binary digits of precision
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DBL_DIG, // Decimal digits of precision
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DBL_MIN_EXP, // Minimum exponent
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DBL_MAX_EXP, // Maximum exponent
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DBL_MIN_10_EXP, // Minimum base 10 exponent
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DBL_MAX_10_EXP, // Maximum base 10 exponent
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0x7ff00000u, // First word of +infinity
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0x7ff10000u, // First word of quiet NaN
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0x7ff90000u, // First word of signaling NaN
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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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static double min() __STL_NOTHROW { return DBL_MIN; }
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static double denorm_min() __STL_NOTHROW { return DBL_MIN; }
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static double max() __STL_NOTHROW { return DBL_MAX; }
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static double epsilon() __STL_NOTHROW { return DBL_EPSILON; }
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static double round_error() __STL_NOTHROW { return 0.5; } // Units: ulps.
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};
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template<> class numeric_limits<long double>
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: public _Floating_limits<long double,
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LDBL_MANT_DIG, // Binary digits of precision
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LDBL_DIG, // Decimal digits of precision
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LDBL_MIN_EXP, // Minimum exponent
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LDBL_MAX_EXP, // Maximum exponent
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LDBL_MIN_10_EXP,// Minimum base 10 exponent
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LDBL_MAX_10_EXP,// Maximum base 10 exponent
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0x7ff00000u, // First word of +infinity
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0x7ff10000u, // First word of quiet NaN
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0x7ff90000u, // First word of signaling NaN
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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() __STL_NOTHROW { return LDBL_MIN; }
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static long double denorm_min() __STL_NOTHROW { return LDBL_MIN; }
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static long double max() __STL_NOTHROW { return LDBL_MAX; }
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static long double epsilon() __STL_NOTHROW { return LDBL_EPSILON; }
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static long double round_error() __STL_NOTHROW { return 4; } // Units: ulps.
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};
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__STL_END_NAMESPACE
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#endif /* __SGI_CPP_LIMITS */
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// Local Variables:
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// mode:C++
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// End:
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