// -*- 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