Initial revision
From-SVN: r22173
This commit is contained in:
Jason Merrill
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70126bf673
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libstdc++/stl/limits
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404
libstdc++/stl/limits
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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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#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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// 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 bool has_denorm = false;
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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(bool, 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) : 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 FDigits, int FDigits10,
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int FMinExp, int FMaxExp,
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int FMinExp10, int FMaxExp10,
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unsigned int FInfinityWord,
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unsigned int FQNaNWord, unsigned int FSNaNWord,
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bool FIsIEC559,
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float_round_style FRoundStyle>
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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 = FDigits;
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static const int digits10 = FDigits10;
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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 = FMinExp;
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static const int max_exponent = FMaxExp;
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static const int min_exponent10 = FMinExp10;
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static const int max_exponent10 = FMaxExp10;
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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 bool has_denorm = false;
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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 inf[sizeof(Number) / sizeof(int)] = { FInfinityWord };
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return *reinterpret_cast<Number*>(&inf);
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}
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static Number quiet_NaN() __STL_NOTHROW {
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static unsigned int nan[sizeof(Number) / sizeof(int)] = { FQNaNWord };
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return *reinterpret_cast<Number*>(&nan);
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}
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static Number signaling_NaN() __STL_NOTHROW {
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static unsigned int nan[sizeof(Number) / sizeof(int)] = { FSNaNWord };
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return *reinterpret_cast<Number*>(&nan);
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}
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static const bool is_iec559 = FIsIEC559;
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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 = FRoundStyle;
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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(bool, 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_NEED_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_NEED_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 _WCHAR_T_IS_KEYWORD
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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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#if defined(_LONGLONG) && _SGIAPI
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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 /* _LONGLONG && _SGIAPI */
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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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