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/** @file
* IPRT / No-CRT - C++ limits header.
*/
/*
* Copyright (C) 2022-2025 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
#ifndef VBOX_INCLUDED_SRC_nocrt_limits
#define VBOX_INCLUDED_SRC_nocrt_limits
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#include <iprt/nocrt/limits.h>
#include <iprt/nocrt/float.h>
namespace std
{
enum float_denorm_style
{
denorm_indeterminate = -1,
denorm_absent,
denorm_present,
};
enum float_round_style
{
round_indeterminate = -1,
round_toward_zero,
round_to_nearest,
round_toward_infinity,
round_toward_neg_infinity,
};
struct rtNoCrtLimitNumericBase
{
static const bool is_specialized = false;
static const bool is_integer = false;
static const bool is_signed = false;
static const bool is_exact = false;
static const bool is_bounded = false;
static const bool has_infinity = false;
static const bool has_quiet_NaN = false;
static const bool has_signaling_NaN = false;
static const bool has_denorm_loss = false;
static const bool is_iec559 = false;
static const bool is_modulo = false;
static const bool traps = false;
static const bool tinyness_before = false;
static const int digits = 0;
static const int digits10 = 0;
static const int max_digits10 = 0;
static const int radix = 0;
static const int min_exponent = 0;
static const int min_exponent10 = 0;
static const int max_exponent = 0;
static const int max_exponent10 = 0;
static const float_denorm_style has_denorm = denorm_absent;
static const float_round_style round_style = round_toward_zero;
};
struct rtNoCrtLimitNumericIntBase : public rtNoCrtLimitNumericBase
{
static const bool is_specialized = true;
static const bool is_integer = true;
static const bool is_exact = true;
static const bool is_bounded = true;
static const int radix = 2;
};
struct rtNoCrtLimitNumericFloatBase : public rtNoCrtLimitNumericBase
{
static const bool is_specialized = true;
static const bool is_signed = true;
static const bool is_bounded = true;
static const bool has_infinity = false;
static const bool has_quiet_NaN = false;
static const bool has_signaling_NaN = false;
static const bool is_iec559 = false;
static const int radix = FLT_RADIX;
static const float_denorm_style has_denorm = denorm_present;
static const float_round_style round_style = round_to_nearest;
};
/*
* Generic template.
*/
template<typename a_Type>
struct numeric_limits : public rtNoCrtLimitNumericBase
{
/** @todo need a RT_CONSTEXPR_FN etc */
static constexpr a_Type(min)() RT_NOEXCEPT { return a_Type(); }
static constexpr a_Type(max)() RT_NOEXCEPT { return a_Type(); }
static constexpr a_Type lowest() RT_NOEXCEPT { return a_Type(); }
static constexpr a_Type epsilon() RT_NOEXCEPT { return a_Type(); }
static constexpr a_Type round_error() RT_NOEXCEPT { return a_Type(); }
static constexpr a_Type infinity() RT_NOEXCEPT { return a_Type(); }
static constexpr a_Type quiet_NaN() RT_NOEXCEPT { return a_Type(); }
static constexpr a_Type signaling_NaN() RT_NOEXCEPT { return a_Type(); }
static constexpr a_Type denorm_min() RT_NOEXCEPT { return a_Type(); }
};
/* const and volatile trickery: */
template<typename a_Type> struct numeric_limits<const a_Type> : public numeric_limits<a_Type> {};
template<typename a_Type> struct numeric_limits<volatile a_Type> : public numeric_limits<a_Type> {};
template<typename a_Type> struct numeric_limits<const volatile a_Type> : public numeric_limits<a_Type> {};
/*
* Integer specializations.
*/
template<>
struct numeric_limits<bool> : public rtNoCrtLimitNumericIntBase
{
static constexpr bool(min)() RT_NOEXCEPT { return false; }
static constexpr bool(max)() RT_NOEXCEPT { return true; }
static constexpr bool lowest() RT_NOEXCEPT { return false; }
static constexpr bool epsilon() RT_NOEXCEPT { return false; }
static constexpr bool round_error() RT_NOEXCEPT { return false; }
static constexpr bool infinity() RT_NOEXCEPT { return false; }
static constexpr bool quiet_NaN() RT_NOEXCEPT { return false; }
static constexpr bool signaling_NaN() RT_NOEXCEPT { return false; }
static constexpr bool denorm_min() RT_NOEXCEPT { return false; }
static const int digits = 1;
};
template<>
struct numeric_limits<char> : public rtNoCrtLimitNumericIntBase
{
static constexpr char(min)() RT_NOEXCEPT { return CHAR_MIN; }
static constexpr char(max)() RT_NOEXCEPT { return CHAR_MAX; }
static constexpr char lowest() RT_NOEXCEPT { return CHAR_MIN; }
static constexpr char epsilon() RT_NOEXCEPT { return 0; }
static constexpr char round_error() RT_NOEXCEPT { return 0; }
static constexpr char infinity() RT_NOEXCEPT { return 0; }
static constexpr char quiet_NaN() RT_NOEXCEPT { return 0; }
static constexpr char signaling_NaN() RT_NOEXCEPT { return 0; }
static constexpr char denorm_min() RT_NOEXCEPT { return 0; }
static const bool is_signed = (char)(-1) < 0;
static const bool is_modulo = (char)(-1) > 0;
static const int digits = (char)(-1) < 0 ? CHAR_BIT - 1 : CHAR_BIT;
static const int digits10 = 2;
};
template<>
struct numeric_limits<signed char> : public rtNoCrtLimitNumericIntBase
{
static constexpr signed char(min)() RT_NOEXCEPT { return SCHAR_MIN; }
static constexpr signed char(max)() RT_NOEXCEPT { return SCHAR_MAX; }
static constexpr signed char lowest() RT_NOEXCEPT { return SCHAR_MIN; }
static constexpr signed char epsilon() RT_NOEXCEPT { return 0; }
static constexpr signed char round_error() RT_NOEXCEPT { return 0; }
static constexpr signed char infinity() RT_NOEXCEPT { return 0; }
static constexpr signed char quiet_NaN() RT_NOEXCEPT { return 0; }
static constexpr signed char signaling_NaN() RT_NOEXCEPT { return 0; }
static constexpr signed char denorm_min() RT_NOEXCEPT { return 0; }
static const bool is_signed = true;
static const int digits = CHAR_BIT - 1;
static const int digits10 = 2;
};
template<>
struct numeric_limits<unsigned char> : public rtNoCrtLimitNumericIntBase
{
static constexpr unsigned char(min)() RT_NOEXCEPT { return 0; }
static constexpr unsigned char(max)() RT_NOEXCEPT { return UCHAR_MAX; }
static constexpr unsigned char lowest() RT_NOEXCEPT { return 0; }
static constexpr unsigned char epsilon() RT_NOEXCEPT { return 0; }
static constexpr unsigned char round_error() RT_NOEXCEPT { return 0; }
static constexpr unsigned char infinity() RT_NOEXCEPT { return 0; }
static constexpr unsigned char quiet_NaN() RT_NOEXCEPT { return 0; }
static constexpr unsigned char signaling_NaN() RT_NOEXCEPT { return 0; }
static constexpr unsigned char denorm_min() RT_NOEXCEPT { return 0; }
static const bool is_modulo = true;
static const int digits = CHAR_BIT;
static const int digits10 = 2;
};
/** @todo wchar_t, char8_t, char16_t, char32_t */
template<>
struct numeric_limits<short> : public rtNoCrtLimitNumericIntBase
{
static constexpr short(min)() RT_NOEXCEPT { return SHRT_MIN; }
static constexpr short(max)() RT_NOEXCEPT { return SHRT_MAX; }
static constexpr short lowest() RT_NOEXCEPT { return SHRT_MIN; }
static constexpr short epsilon() RT_NOEXCEPT { return 0; }
static constexpr short round_error() RT_NOEXCEPT { return 0; }
static constexpr short infinity() RT_NOEXCEPT { return 0; }
static constexpr short quiet_NaN() RT_NOEXCEPT { return 0; }
static constexpr short signaling_NaN() RT_NOEXCEPT { return 0; }
static constexpr short denorm_min() RT_NOEXCEPT { return 0; }
static const bool is_signed = true;
static const int digits = CHAR_BIT * sizeof(short) - 1;
static const int digits10 = 4;
};
template<>
struct numeric_limits<unsigned short> : public rtNoCrtLimitNumericIntBase
{
static constexpr unsigned short(min)() RT_NOEXCEPT { return 0; }
static constexpr unsigned short(max)() RT_NOEXCEPT { return USHRT_MAX; }
static constexpr unsigned short lowest() RT_NOEXCEPT { return 0; }
static constexpr unsigned short epsilon() RT_NOEXCEPT { return 0; }
static constexpr unsigned short round_error() RT_NOEXCEPT { return 0; }
static constexpr unsigned short infinity() RT_NOEXCEPT { return 0; }
static constexpr unsigned short quiet_NaN() RT_NOEXCEPT { return 0; }
static constexpr unsigned short signaling_NaN() RT_NOEXCEPT { return 0; }
static constexpr unsigned short denorm_min() RT_NOEXCEPT { return 0; }
static const bool is_modulo = true;
static const int digits = CHAR_BIT * sizeof(unsigned short);
static const int digits10 = 4;
};
# if !defined(_MSC_VER) || defined(_NATIVE_WCHAR_T_DEFINED)
template<>
struct numeric_limits<wchar_t> : public rtNoCrtLimitNumericIntBase
{
static constexpr wchar_t(min)() RT_NOEXCEPT { return WCHAR_MIN; }
static constexpr wchar_t(max)() RT_NOEXCEPT { return WCHAR_MAX; }
static constexpr wchar_t lowest() RT_NOEXCEPT { return WCHAR_MIN; }
static constexpr wchar_t epsilon() RT_NOEXCEPT { return 0; }
static constexpr wchar_t round_error() RT_NOEXCEPT { return 0; }
static constexpr wchar_t infinity() RT_NOEXCEPT { return 0; }
static constexpr wchar_t quiet_NaN() RT_NOEXCEPT { return 0; }
static constexpr wchar_t signaling_NaN() RT_NOEXCEPT { return 0; }
static constexpr wchar_t denorm_min() RT_NOEXCEPT { return 0; }
static const bool is_modulo = true;
static const int digits = CHAR_BIT * sizeof(wchar_t);
static const int digits10 = sizeof(wchar_t) == 2 ? 4 : 9; /** @todo ASSUMES wchar_t is either 16 or 32 bits */
};
# endif
template<>
struct numeric_limits<char16_t> : public rtNoCrtLimitNumericIntBase
{
static constexpr char16_t(min)() RT_NOEXCEPT { return 0; }
static constexpr char16_t(max)() RT_NOEXCEPT { return USHRT_MAX; }
static constexpr char16_t lowest() RT_NOEXCEPT { return 0; }
static constexpr char16_t epsilon() RT_NOEXCEPT { return 0; }
static constexpr char16_t round_error() RT_NOEXCEPT { return 0; }
static constexpr char16_t infinity() RT_NOEXCEPT { return 0; }
static constexpr char16_t quiet_NaN() RT_NOEXCEPT { return 0; }
static constexpr char16_t signaling_NaN() RT_NOEXCEPT { return 0; }
static constexpr char16_t denorm_min() RT_NOEXCEPT { return 0; }
static const bool is_modulo = true;
static const int digits = CHAR_BIT * sizeof(char16_t);
static const int digits10 = 4;
};
template<>
struct numeric_limits<int> : public rtNoCrtLimitNumericIntBase
{
static constexpr int(min)() RT_NOEXCEPT { return INT_MIN; }
static constexpr int(max)() RT_NOEXCEPT { return INT_MAX; }
static constexpr int lowest() RT_NOEXCEPT { return INT_MIN; }
static constexpr int epsilon() RT_NOEXCEPT { return 0; }
static constexpr int round_error() RT_NOEXCEPT { return 0; }
static constexpr int infinity() RT_NOEXCEPT { return 0; }
static constexpr int quiet_NaN() RT_NOEXCEPT { return 0; }
static constexpr int signaling_NaN() RT_NOEXCEPT { return 0; }
static constexpr int denorm_min() RT_NOEXCEPT { return 0; }
static const bool is_signed = true;
static const int digits = CHAR_BIT * sizeof(int) - 1;
static const int digits10 = 9;
};
template<>
struct numeric_limits<unsigned int> : public rtNoCrtLimitNumericIntBase
{
static constexpr unsigned int(min)() RT_NOEXCEPT { return 0; }
static constexpr unsigned int(max)() RT_NOEXCEPT { return UINT_MAX; }
static constexpr unsigned int lowest() RT_NOEXCEPT { return 0; }
static constexpr unsigned int epsilon() RT_NOEXCEPT { return 0; }
static constexpr unsigned int round_error() RT_NOEXCEPT { return 0; }
static constexpr unsigned int infinity() RT_NOEXCEPT { return 0; }
static constexpr unsigned int quiet_NaN() RT_NOEXCEPT { return 0; }
static constexpr unsigned int signaling_NaN() RT_NOEXCEPT { return 0; }
static constexpr unsigned int denorm_min() RT_NOEXCEPT { return 0; }
static const bool is_modulo = true;
static const int digits = CHAR_BIT * sizeof(unsigned int);
static const int digits10 = 9;
};
template<>
struct numeric_limits<char32_t> : public rtNoCrtLimitNumericIntBase
{
static constexpr char32_t(min)() RT_NOEXCEPT { return 0; }
static constexpr char32_t(max)() RT_NOEXCEPT { return UINT_MAX; }
static constexpr char32_t lowest() RT_NOEXCEPT { return 0; }
static constexpr char32_t epsilon() RT_NOEXCEPT { return 0; }
static constexpr char32_t round_error() RT_NOEXCEPT { return 0; }
static constexpr char32_t infinity() RT_NOEXCEPT { return 0; }
static constexpr char32_t quiet_NaN() RT_NOEXCEPT { return 0; }
static constexpr char32_t signaling_NaN() RT_NOEXCEPT { return 0; }
static constexpr char32_t denorm_min() RT_NOEXCEPT { return 0; }
static const bool is_modulo = true;
static const int digits = CHAR_BIT * sizeof(char32_t);
static const int digits10 = 9;
};
template<>
struct numeric_limits<long> : public rtNoCrtLimitNumericIntBase
{
static constexpr long(min)() RT_NOEXCEPT { return LONG_MIN; }
static constexpr long(max)() RT_NOEXCEPT { return LONG_MAX; }
static constexpr long lowest() RT_NOEXCEPT { return LONG_MIN; }
static constexpr long epsilon() RT_NOEXCEPT { return 0; }
static constexpr long round_error() RT_NOEXCEPT { return 0; }
static constexpr long infinity() RT_NOEXCEPT { return 0; }
static constexpr long quiet_NaN() RT_NOEXCEPT { return 0; }
static constexpr long signaling_NaN() RT_NOEXCEPT { return 0; }
static constexpr long denorm_min() RT_NOEXCEPT { return 0; }
static const bool is_signed = true;
static const int digits = CHAR_BIT * sizeof(long) - 1;
static const int digits10 = sizeof(long) == sizeof(int) ? 9 : 18;
};
template<>
struct numeric_limits<unsigned long> : public rtNoCrtLimitNumericIntBase
{
static constexpr unsigned long(min)() RT_NOEXCEPT { return 0; }
static constexpr unsigned long(max)() RT_NOEXCEPT { return ULONG_MAX; }
static constexpr unsigned long lowest() RT_NOEXCEPT { return 0; }
static constexpr unsigned long epsilon() RT_NOEXCEPT { return 0; }
static constexpr unsigned long round_error() RT_NOEXCEPT { return 0; }
static constexpr unsigned long infinity() RT_NOEXCEPT { return 0; }
static constexpr unsigned long quiet_NaN() RT_NOEXCEPT { return 0; }
static constexpr unsigned long signaling_NaN() RT_NOEXCEPT { return 0; }
static constexpr unsigned long denorm_min() RT_NOEXCEPT { return 0; }
static const bool is_modulo = true;
static const int digits = CHAR_BIT * sizeof(unsigned long);
static const int digits10 = sizeof(unsigned long) == sizeof(unsigned int) ? 9 : 19;
};
template<>
struct numeric_limits<long long> : public rtNoCrtLimitNumericIntBase
{
static constexpr long long(min)() RT_NOEXCEPT { return LLONG_MIN; }
static constexpr long long(max)() RT_NOEXCEPT { return LLONG_MAX; }
static constexpr long long lowest() RT_NOEXCEPT { return LLONG_MIN; }
static constexpr long long epsilon() RT_NOEXCEPT { return 0; }
static constexpr long long round_error() RT_NOEXCEPT { return 0; }
static constexpr long long infinity() RT_NOEXCEPT { return 0; }
static constexpr long long quiet_NaN() RT_NOEXCEPT { return 0; }
static constexpr long long signaling_NaN() RT_NOEXCEPT { return 0; }
static constexpr long long denorm_min() RT_NOEXCEPT { return 0; }
static const bool is_signed = true;
static const int digits = CHAR_BIT * sizeof(long long) - 1;
static const int digits10 = 18;
};
template<>
struct numeric_limits<unsigned long long> : public rtNoCrtLimitNumericIntBase
{
static constexpr unsigned long long(min)() RT_NOEXCEPT { return 0; }
static constexpr unsigned long long(max)() RT_NOEXCEPT { return ULLONG_MAX; }
static constexpr unsigned long long lowest() RT_NOEXCEPT { return 0; }
static constexpr unsigned long long epsilon() RT_NOEXCEPT { return 0; }
static constexpr unsigned long long round_error() RT_NOEXCEPT { return 0; }
static constexpr unsigned long long infinity() RT_NOEXCEPT { return 0; }
static constexpr unsigned long long quiet_NaN() RT_NOEXCEPT { return 0; }
static constexpr unsigned long long signaling_NaN() RT_NOEXCEPT { return 0; }
static constexpr unsigned long long denorm_min() RT_NOEXCEPT { return 0; }
static const bool is_modulo = true;
static const int digits = CHAR_BIT * sizeof(unsigned long long);
static const int digits10 = 19;
};
/*
* Floating point.
*/
template<>
struct numeric_limits<float> : public rtNoCrtLimitNumericFloatBase
{
static constexpr float(min)() RT_NOEXCEPT { return FLT_MIN; }
static constexpr float(max)() RT_NOEXCEPT { return FLT_MAX; }
static constexpr float lowest() RT_NOEXCEPT { return -(FLT_MAX); }
static constexpr float epsilon() RT_NOEXCEPT { return FLT_EPSILON; }
static constexpr float round_error() RT_NOEXCEPT { return 0.5F; }
static constexpr float infinity() RT_NOEXCEPT { return __builtin_huge_valf(); }
static constexpr float quiet_NaN() RT_NOEXCEPT { return __builtin_nanf("0"); }
static constexpr float signaling_NaN() RT_NOEXCEPT { return __builtin_nansf("1"); }
static constexpr float denorm_min() RT_NOEXCEPT { return FLT_TRUE_MIN; }
static const int digits = FLT_MANT_DIG;
static const int digits10 = FLT_DIG;
static const int max_digits10 = FLT_DECIMAL_DIG;
static const int max_exponent = FLT_MAX_EXP;
static const int max_exponent10 = FLT_MAX_10_EXP;
static const int min_exponent = FLT_MIN_EXP;
static const int min_exponent10 = FLT_MIN_10_EXP;
};
template<>
struct numeric_limits<double> : public rtNoCrtLimitNumericFloatBase
{
static constexpr double(min)() RT_NOEXCEPT { return DBL_MIN; }
static constexpr double(max)() RT_NOEXCEPT { return DBL_MAX; }
static constexpr double lowest() RT_NOEXCEPT { return -(DBL_MAX); }
static constexpr double epsilon() RT_NOEXCEPT { return DBL_EPSILON; }
static constexpr double round_error() RT_NOEXCEPT { return 0.5; }
static constexpr double infinity() RT_NOEXCEPT { return __builtin_huge_val(); }
static constexpr double quiet_NaN() RT_NOEXCEPT { return __builtin_nan("0"); }
static constexpr double signaling_NaN() RT_NOEXCEPT { return __builtin_nans("1"); }
static constexpr double denorm_min() RT_NOEXCEPT { return DBL_TRUE_MIN; }
static const int digits = DBL_MANT_DIG;
static const int digits10 = DBL_DIG;
static const int max_digits10 = DBL_DECIMAL_DIG;
static const int max_exponent = DBL_MAX_EXP;
static const int max_exponent10 = DBL_MAX_10_EXP;
static const int min_exponent = DBL_MIN_EXP;
static const int min_exponent10 = DBL_MIN_10_EXP;
};
template<>
struct numeric_limits<long double> : public rtNoCrtLimitNumericFloatBase
{
static constexpr long double(min)() RT_NOEXCEPT { return LDBL_MIN; }
static constexpr long double(max)() RT_NOEXCEPT { return LDBL_MAX; }
static constexpr long double lowest() RT_NOEXCEPT { return -(LDBL_MAX); }
static constexpr long double epsilon() RT_NOEXCEPT { return LDBL_EPSILON; }
static constexpr long double round_error() RT_NOEXCEPT { return 0.5L; }
#if LDBL_DIG == DBL_DIG
static constexpr long double infinity() RT_NOEXCEPT { return __builtin_huge_val(); }
static constexpr long double quiet_NaN() RT_NOEXCEPT { return __builtin_nan("0"); }
static constexpr long double signaling_NaN() RT_NOEXCEPT { return __builtin_nans("1"); }
#else
static constexpr long double infinity() RT_NOEXCEPT { return __builtin_huge_vall(); }
static constexpr long double quiet_NaN() RT_NOEXCEPT { return __builtin_nanl("0"); }
static constexpr long double signaling_NaN() RT_NOEXCEPT { return __builtin_nansl("1"); }
#endif
static constexpr long double denorm_min() RT_NOEXCEPT { return LDBL_TRUE_MIN; }
static const int digits = LDBL_MANT_DIG;
static const int digits10 = LDBL_DIG;
static const int max_digits10 = LDBL_DECIMAL_DIG;
static const int max_exponent = LDBL_MAX_EXP;
static const int max_exponent10 = LDBL_MAX_10_EXP;
static const int min_exponent = LDBL_MIN_EXP;
static const int min_exponent10 = LDBL_MIN_10_EXP;
};
/** @todo more types */
}
#endif /* !VBOX_INCLUDED_SRC_nocrt_limits */
|
