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// -*- C++ -*- |
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// Copyright (C) 2007-2015 Free Software Foundation, Inc. |
// |
// This file is part of the GNU ISO C++ Library. This library 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; either version 3, or (at your option) any later |
// version. |
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// This library 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. |
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// Under Section 7 of GPL version 3, you are granted additional |
// permissions described in the GCC Runtime Library Exception, version |
// 3.1, as published by the Free Software Foundation. |
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// You should have received a copy of the GNU General Public License and |
// a copy of the GCC Runtime Library Exception along with this program; |
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
// <http://www.gnu.org/licenses/>. |
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/** @file ext/numeric_traits.h |
* This file is a GNU extension to the Standard C++ Library. |
*/ |
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#ifndef _EXT_NUMERIC_TRAITS |
#define _EXT_NUMERIC_TRAITS 1 |
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#pragma GCC system_header |
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#include <bits/cpp_type_traits.h> |
#include <ext/type_traits.h> |
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namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) |
{ |
_GLIBCXX_BEGIN_NAMESPACE_VERSION |
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// Compile time constants for builtin types. |
// Sadly std::numeric_limits member functions cannot be used for this. |
#define __glibcxx_signed(_Tp) ((_Tp)(-1) < 0) |
#define __glibcxx_digits(_Tp) \ |
(sizeof(_Tp) * __CHAR_BIT__ - __glibcxx_signed(_Tp)) |
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#define __glibcxx_min(_Tp) \ |
(__glibcxx_signed(_Tp) ? (_Tp)1 << __glibcxx_digits(_Tp) : (_Tp)0) |
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#define __glibcxx_max(_Tp) \ |
(__glibcxx_signed(_Tp) ? \ |
(((((_Tp)1 << (__glibcxx_digits(_Tp) - 1)) - 1) << 1) + 1) : ~(_Tp)0) |
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template<typename _Value> |
struct __numeric_traits_integer |
{ |
// Only integers for initialization of member constant. |
static const _Value __min = __glibcxx_min(_Value); |
static const _Value __max = __glibcxx_max(_Value); |
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// NB: these two also available in std::numeric_limits as compile |
// time constants, but <limits> is big and we avoid including it. |
static const bool __is_signed = __glibcxx_signed(_Value); |
static const int __digits = __glibcxx_digits(_Value); |
}; |
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template<typename _Value> |
const _Value __numeric_traits_integer<_Value>::__min; |
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template<typename _Value> |
const _Value __numeric_traits_integer<_Value>::__max; |
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template<typename _Value> |
const bool __numeric_traits_integer<_Value>::__is_signed; |
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template<typename _Value> |
const int __numeric_traits_integer<_Value>::__digits; |
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#undef __glibcxx_signed |
#undef __glibcxx_digits |
#undef __glibcxx_min |
#undef __glibcxx_max |
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#define __glibcxx_floating(_Tp, _Fval, _Dval, _LDval) \ |
(std::__are_same<_Tp, float>::__value ? _Fval \ |
: std::__are_same<_Tp, double>::__value ? _Dval : _LDval) |
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#define __glibcxx_max_digits10(_Tp) \ |
(2 + __glibcxx_floating(_Tp, __FLT_MANT_DIG__, __DBL_MANT_DIG__, \ |
__LDBL_MANT_DIG__) * 643L / 2136) |
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#define __glibcxx_digits10(_Tp) \ |
__glibcxx_floating(_Tp, __FLT_DIG__, __DBL_DIG__, __LDBL_DIG__) |
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#define __glibcxx_max_exponent10(_Tp) \ |
__glibcxx_floating(_Tp, __FLT_MAX_10_EXP__, __DBL_MAX_10_EXP__, \ |
__LDBL_MAX_10_EXP__) |
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template<typename _Value> |
struct __numeric_traits_floating |
{ |
// Only floating point types. See N1822. |
static const int __max_digits10 = __glibcxx_max_digits10(_Value); |
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// See above comment... |
static const bool __is_signed = true; |
static const int __digits10 = __glibcxx_digits10(_Value); |
static const int __max_exponent10 = __glibcxx_max_exponent10(_Value); |
}; |
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template<typename _Value> |
const int __numeric_traits_floating<_Value>::__max_digits10; |
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template<typename _Value> |
const bool __numeric_traits_floating<_Value>::__is_signed; |
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template<typename _Value> |
const int __numeric_traits_floating<_Value>::__digits10; |
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template<typename _Value> |
const int __numeric_traits_floating<_Value>::__max_exponent10; |
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template<typename _Value> |
struct __numeric_traits |
: public __conditional_type<std::__is_integer<_Value>::__value, |
__numeric_traits_integer<_Value>, |
__numeric_traits_floating<_Value> >::__type |
{ }; |
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_GLIBCXX_END_NAMESPACE_VERSION |
} // namespace |
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#undef __glibcxx_floating |
#undef __glibcxx_max_digits10 |
#undef __glibcxx_digits10 |
#undef __glibcxx_max_exponent10 |
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#endif |