139 lines
4.5 KiB
C++
139 lines
4.5 KiB
C++
// -*- C++ -*-
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// Copyright (C) 2007-2017 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the terms
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// of the GNU General Public License as published by the Free Software
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// Foundation; either version 3, or (at your option) any later
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// version.
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 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
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file ext/numeric_traits.h
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* This file is a GNU extension to the Standard C++ Library.
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*/
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#ifndef _EXT_NUMERIC_TRAITS
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#define _EXT_NUMERIC_TRAITS 1
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#pragma GCC system_header
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#include <bits/cpp_type_traits.h>
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#include <ext/type_traits.h>
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namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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// Compile time constants for builtin types.
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// Sadly std::numeric_limits member functions cannot be used for this.
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#define __glibcxx_signed(_Tp) ((_Tp)(-1) < 0)
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#define __glibcxx_digits(_Tp) \
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(sizeof(_Tp) * __CHAR_BIT__ - __glibcxx_signed(_Tp))
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#define __glibcxx_min(_Tp) \
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(__glibcxx_signed(_Tp) ? (_Tp)1 << __glibcxx_digits(_Tp) : (_Tp)0)
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#define __glibcxx_max(_Tp) \
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(__glibcxx_signed(_Tp) ? \
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(((((_Tp)1 << (__glibcxx_digits(_Tp) - 1)) - 1) << 1) + 1) : ~(_Tp)0)
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template<typename _Value>
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struct __numeric_traits_integer
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{
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// Only integers for initialization of member constant.
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static const _Value __min = __glibcxx_min(_Value);
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static const _Value __max = __glibcxx_max(_Value);
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// NB: these two also available in std::numeric_limits as compile
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// time constants, but <limits> is big and we avoid including it.
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static const bool __is_signed = __glibcxx_signed(_Value);
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static const int __digits = __glibcxx_digits(_Value);
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};
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template<typename _Value>
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const _Value __numeric_traits_integer<_Value>::__min;
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template<typename _Value>
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const _Value __numeric_traits_integer<_Value>::__max;
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template<typename _Value>
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const bool __numeric_traits_integer<_Value>::__is_signed;
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template<typename _Value>
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const int __numeric_traits_integer<_Value>::__digits;
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#undef __glibcxx_signed
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#undef __glibcxx_digits
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#undef __glibcxx_min
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#undef __glibcxx_max
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#define __glibcxx_floating(_Tp, _Fval, _Dval, _LDval) \
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(std::__are_same<_Tp, float>::__value ? _Fval \
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: std::__are_same<_Tp, double>::__value ? _Dval : _LDval)
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#define __glibcxx_max_digits10(_Tp) \
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(2 + __glibcxx_floating(_Tp, __FLT_MANT_DIG__, __DBL_MANT_DIG__, \
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__LDBL_MANT_DIG__) * 643L / 2136)
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#define __glibcxx_digits10(_Tp) \
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__glibcxx_floating(_Tp, __FLT_DIG__, __DBL_DIG__, __LDBL_DIG__)
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#define __glibcxx_max_exponent10(_Tp) \
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__glibcxx_floating(_Tp, __FLT_MAX_10_EXP__, __DBL_MAX_10_EXP__, \
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__LDBL_MAX_10_EXP__)
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template<typename _Value>
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struct __numeric_traits_floating
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{
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// Only floating point types. See N1822.
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static const int __max_digits10 = __glibcxx_max_digits10(_Value);
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// See above comment...
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static const bool __is_signed = true;
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static const int __digits10 = __glibcxx_digits10(_Value);
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static const int __max_exponent10 = __glibcxx_max_exponent10(_Value);
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};
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template<typename _Value>
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const int __numeric_traits_floating<_Value>::__max_digits10;
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template<typename _Value>
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const bool __numeric_traits_floating<_Value>::__is_signed;
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template<typename _Value>
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const int __numeric_traits_floating<_Value>::__digits10;
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template<typename _Value>
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const int __numeric_traits_floating<_Value>::__max_exponent10;
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template<typename _Value>
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struct __numeric_traits
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: public __conditional_type<std::__is_integer<_Value>::__value,
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__numeric_traits_integer<_Value>,
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__numeric_traits_floating<_Value> >::__type
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{ };
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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#undef __glibcxx_floating
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#undef __glibcxx_max_digits10
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#undef __glibcxx_digits10
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#undef __glibcxx_max_exponent10
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#endif
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