| // -*- C++ -*- |
| |
| // Copyright (C) 2007 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 2, or (at your option) any later |
| // version. |
| |
| // 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. |
| |
| // You should have received a copy of the GNU General Public License along |
| // with this library; see the file COPYING. If not, write to the Free |
| // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, |
| // USA. |
| |
| // As a special exception, you may use this file as part of a free |
| // software library without restriction. Specifically, if other files |
| // instantiate templates or use macros or inline functions from this |
| // file, or you compile this file and link it with other files to |
| // produce an executable, this file does not by itself cause the |
| // resulting executable to be covered by the GNU General Public |
| // License. This exception does not however invalidate any other |
| // reasons why the executable file might be covered by the GNU General |
| // Public License. |
| |
| /** @file ext/numeric_traits.h |
| * This file is a GNU extension to the Standard C++ Library. |
| */ |
| |
| #ifndef _EXT_NUMERIC_TRAITS |
| #define _EXT_NUMERIC_TRAITS 1 |
| |
| #pragma GCC system_header |
| |
| #include <limits> |
| #include <bits/cpp_type_traits.h> |
| #include <ext/type_traits.h> |
| |
| _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) |
| |
| // 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)) |
| |
| #define __glibcxx_min(_Tp) \ |
| (__glibcxx_signed(_Tp) ? (_Tp)1 << __glibcxx_digits(_Tp) : (_Tp)0) |
| |
| #define __glibcxx_max(_Tp) \ |
| (__glibcxx_signed(_Tp) ? \ |
| (((((_Tp)1 << (__glibcxx_digits(_Tp) - 1)) - 1) << 1) + 1) : ~(_Tp)0) |
| |
| 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); |
| }; |
| |
| template<typename _Value> |
| const _Value __numeric_traits_integer<_Value>::__min; |
| |
| template<typename _Value> |
| const _Value __numeric_traits_integer<_Value>::__max; |
| |
| template<typename _Value> |
| struct __numeric_traits_floating |
| { |
| // Only floating point types. See N1822. |
| static const int __max_digits10 = |
| 2 + std::numeric_limits<_Value>::digits * 3010/10000; |
| }; |
| |
| template<typename _Value> |
| const int __numeric_traits_floating<_Value>::__max_digits10; |
| |
| template<typename _Value> |
| struct __numeric_traits |
| : public __conditional_type<std::__is_integer<_Value>::__value, |
| __numeric_traits_integer<_Value>, |
| __numeric_traits_floating<_Value> >::__type |
| { }; |
| |
| _GLIBCXX_END_NAMESPACE |
| |
| #undef __glibcxx_signed |
| #undef __glibcxx_min |
| #undef __glibcxx_max |
| #undef __glibcxx_digits |
| |
| #endif |