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<div class="title">numeric_traits.h</div> </div>
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<a href="a00962.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// -*- C++ -*-</span>
<a name="l00002"></a>00002
<a name="l00003"></a>00003 <span class="comment">// Copyright (C) 2007, 2008, 2009, 2010 Free Software Foundation, Inc.</span>
<a name="l00004"></a>00004 <span class="comment">//</span>
<a name="l00005"></a>00005 <span class="comment">// This file is part of the GNU ISO C++ Library. This library is free</span>
<a name="l00006"></a>00006 <span class="comment">// software; you can redistribute it and/or modify it under the terms</span>
<a name="l00007"></a>00007 <span class="comment">// of the GNU General Public License as published by the Free Software</span>
<a name="l00008"></a>00008 <span class="comment">// Foundation; either version 3, or (at your option) any later</span>
<a name="l00009"></a>00009 <span class="comment">// version.</span>
<a name="l00010"></a>00010
<a name="l00011"></a>00011 <span class="comment">// This library is distributed in the hope that it will be useful, but</span>
<a name="l00012"></a>00012 <span class="comment">// WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00013"></a>00013 <span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
<a name="l00014"></a>00014 <span class="comment">// General Public License for more details.</span>
<a name="l00015"></a>00015
<a name="l00016"></a>00016 <span class="comment">// Under Section 7 of GPL version 3, you are granted additional</span>
<a name="l00017"></a>00017 <span class="comment">// permissions described in the GCC Runtime Library Exception, version</span>
<a name="l00018"></a>00018 <span class="comment">// 3.1, as published by the Free Software Foundation.</span>
<a name="l00019"></a>00019
<a name="l00020"></a>00020 <span class="comment">// You should have received a copy of the GNU General Public License and</span>
<a name="l00021"></a>00021 <span class="comment">// a copy of the GCC Runtime Library Exception along with this program;</span>
<a name="l00022"></a>00022 <span class="comment">// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see</span>
<a name="l00023"></a>00023 <span class="comment">// <http://www.gnu.org/licenses/>.</span>
<a name="l00024"></a>00024 <span class="comment"></span>
<a name="l00025"></a>00025 <span class="comment">/** @file ext/numeric_traits.h</span>
<a name="l00026"></a>00026 <span class="comment"> * This file is a GNU extension to the Standard C++ Library.</span>
<a name="l00027"></a>00027 <span class="comment"> */</span>
<a name="l00028"></a>00028
<a name="l00029"></a>00029 <span class="preprocessor">#ifndef _EXT_NUMERIC_TRAITS</span>
<a name="l00030"></a>00030 <span class="preprocessor"></span><span class="preprocessor">#define _EXT_NUMERIC_TRAITS 1</span>
<a name="l00031"></a>00031 <span class="preprocessor"></span>
<a name="l00032"></a>00032 <span class="preprocessor">#pragma GCC system_header</span>
<a name="l00033"></a>00033 <span class="preprocessor"></span>
<a name="l00034"></a>00034 <span class="preprocessor">#include <<a class="code" href="a00821.html">bits/cpp_type_traits.h</a>></span>
<a name="l00035"></a>00035 <span class="preprocessor">#include <<a class="code" href="a01091.html">ext/type_traits.h</a>></span>
<a name="l00036"></a>00036
<a name="l00037"></a>00037 <span class="keyword">namespace </span>__gnu_cxx _GLIBCXX_VISIBILITY(default)
<a name="l00038"></a>00038 {
<a name="l00039"></a>00039 _GLIBCXX_BEGIN_NAMESPACE_VERSION
<a name="l00040"></a>00040
<a name="l00041"></a>00041 <span class="comment">// Compile time constants for builtin types.</span>
<a name="l00042"></a>00042 <span class="comment">// Sadly std::numeric_limits member functions cannot be used for this.</span>
<a name="l00043"></a>00043 <span class="preprocessor">#define __glibcxx_signed(_Tp) ((_Tp)(-1) < 0)</span>
<a name="l00044"></a>00044 <span class="preprocessor"></span><span class="preprocessor">#define __glibcxx_digits(_Tp) \</span>
<a name="l00045"></a>00045 <span class="preprocessor"> (sizeof(_Tp) * __CHAR_BIT__ - __glibcxx_signed(_Tp))</span>
<a name="l00046"></a>00046 <span class="preprocessor"></span>
<a name="l00047"></a>00047 <span class="preprocessor">#define __glibcxx_min(_Tp) \</span>
<a name="l00048"></a>00048 <span class="preprocessor"> (__glibcxx_signed(_Tp) ? (_Tp)1 << __glibcxx_digits(_Tp) : (_Tp)0)</span>
<a name="l00049"></a>00049 <span class="preprocessor"></span>
<a name="l00050"></a>00050 <span class="preprocessor">#define __glibcxx_max(_Tp) \</span>
<a name="l00051"></a>00051 <span class="preprocessor"> (__glibcxx_signed(_Tp) ? \</span>
<a name="l00052"></a>00052 <span class="preprocessor"> (((((_Tp)1 << (__glibcxx_digits(_Tp) - 1)) - 1) << 1) + 1) : ~(_Tp)0)</span>
<a name="l00053"></a>00053 <span class="preprocessor"></span>
<a name="l00054"></a>00054 <span class="keyword">template</span><<span class="keyword">typename</span> _Value>
<a name="l00055"></a>00055 <span class="keyword">struct </span>__numeric_traits_integer
<a name="l00056"></a>00056 {
<a name="l00057"></a>00057 <span class="comment">// Only integers for initialization of member constant.</span>
<a name="l00058"></a>00058 <span class="keyword">static</span> <span class="keyword">const</span> _Value __min = __glibcxx_min(_Value);
<a name="l00059"></a>00059 <span class="keyword">static</span> <span class="keyword">const</span> _Value __max = __glibcxx_max(_Value);
<a name="l00060"></a>00060
<a name="l00061"></a>00061 <span class="comment">// NB: these two also available in std::numeric_limits as compile</span>
<a name="l00062"></a>00062 <span class="comment">// time constants, but <limits> is big and we avoid including it.</span>
<a name="l00063"></a>00063 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">bool</span> __is_signed = __glibcxx_signed(_Value);
<a name="l00064"></a>00064 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> __digits = __glibcxx_digits(_Value);
<a name="l00065"></a>00065 };
<a name="l00066"></a>00066
<a name="l00067"></a>00067 <span class="keyword">template</span><<span class="keyword">typename</span> _Value>
<a name="l00068"></a>00068 <span class="keyword">const</span> _Value __numeric_traits_integer<_Value>::__min;
<a name="l00069"></a>00069
<a name="l00070"></a>00070 <span class="keyword">template</span><<span class="keyword">typename</span> _Value>
<a name="l00071"></a>00071 <span class="keyword">const</span> _Value __numeric_traits_integer<_Value>::__max;
<a name="l00072"></a>00072
<a name="l00073"></a>00073 <span class="keyword">template</span><<span class="keyword">typename</span> _Value>
<a name="l00074"></a>00074 <span class="keyword">const</span> <span class="keywordtype">bool</span> __numeric_traits_integer<_Value>::__is_signed;
<a name="l00075"></a>00075
<a name="l00076"></a>00076 <span class="keyword">template</span><<span class="keyword">typename</span> _Value>
<a name="l00077"></a>00077 <span class="keyword">const</span> <span class="keywordtype">int</span> __numeric_traits_integer<_Value>::__digits;
<a name="l00078"></a>00078
<a name="l00079"></a>00079 <span class="preprocessor">#undef __glibcxx_signed</span>
<a name="l00080"></a>00080 <span class="preprocessor"></span><span class="preprocessor">#undef __glibcxx_digits</span>
<a name="l00081"></a>00081 <span class="preprocessor"></span><span class="preprocessor">#undef __glibcxx_min</span>
<a name="l00082"></a>00082 <span class="preprocessor"></span><span class="preprocessor">#undef __glibcxx_max</span>
<a name="l00083"></a>00083 <span class="preprocessor"></span>
<a name="l00084"></a>00084 <span class="preprocessor">#define __glibcxx_floating(_Tp, _Fval, _Dval, _LDval) \</span>
<a name="l00085"></a>00085 <span class="preprocessor"> (std::__are_same<_Tp, float>::__value ? _Fval \</span>
<a name="l00086"></a>00086 <span class="preprocessor"> : std::__are_same<_Tp, double>::__value ? _Dval : _LDval)</span>
<a name="l00087"></a>00087 <span class="preprocessor"></span>
<a name="l00088"></a>00088 <span class="preprocessor">#define __glibcxx_max_digits10(_Tp) \</span>
<a name="l00089"></a>00089 <span class="preprocessor"> (2 + __glibcxx_floating(_Tp, __FLT_MANT_DIG__, __DBL_MANT_DIG__, \</span>
<a name="l00090"></a>00090 <span class="preprocessor"> __LDBL_MANT_DIG__) * 643L / 2136)</span>
<a name="l00091"></a>00091 <span class="preprocessor"></span>
<a name="l00092"></a>00092 <span class="preprocessor">#define __glibcxx_digits10(_Tp) \</span>
<a name="l00093"></a>00093 <span class="preprocessor"> __glibcxx_floating(_Tp, __FLT_DIG__, __DBL_DIG__, __LDBL_DIG__)</span>
<a name="l00094"></a>00094 <span class="preprocessor"></span>
<a name="l00095"></a>00095 <span class="preprocessor">#define __glibcxx_max_exponent10(_Tp) \</span>
<a name="l00096"></a>00096 <span class="preprocessor"> __glibcxx_floating(_Tp, __FLT_MAX_10_EXP__, __DBL_MAX_10_EXP__, \</span>
<a name="l00097"></a>00097 <span class="preprocessor"> __LDBL_MAX_10_EXP__)</span>
<a name="l00098"></a>00098 <span class="preprocessor"></span>
<a name="l00099"></a>00099 <span class="keyword">template</span><<span class="keyword">typename</span> _Value>
<a name="l00100"></a>00100 <span class="keyword">struct </span>__numeric_traits_floating
<a name="l00101"></a>00101 {
<a name="l00102"></a>00102 <span class="comment">// Only floating point types. See N1822. </span>
<a name="l00103"></a>00103 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> __max_digits10 = __glibcxx_max_digits10(_Value);
<a name="l00104"></a>00104
<a name="l00105"></a>00105 <span class="comment">// See above comment...</span>
<a name="l00106"></a>00106 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">bool</span> __is_signed = <span class="keyword">true</span>;
<a name="l00107"></a>00107 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> __digits10 = __glibcxx_digits10(_Value);
<a name="l00108"></a>00108 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> __max_exponent10 = __glibcxx_max_exponent10(_Value);
<a name="l00109"></a>00109 };
<a name="l00110"></a>00110
<a name="l00111"></a>00111 <span class="keyword">template</span><<span class="keyword">typename</span> _Value>
<a name="l00112"></a>00112 <span class="keyword">const</span> <span class="keywordtype">int</span> __numeric_traits_floating<_Value>::__max_digits10;
<a name="l00113"></a>00113
<a name="l00114"></a>00114 <span class="keyword">template</span><<span class="keyword">typename</span> _Value>
<a name="l00115"></a>00115 <span class="keyword">const</span> <span class="keywordtype">bool</span> __numeric_traits_floating<_Value>::__is_signed;
<a name="l00116"></a>00116
<a name="l00117"></a>00117 <span class="keyword">template</span><<span class="keyword">typename</span> _Value>
<a name="l00118"></a>00118 <span class="keyword">const</span> <span class="keywordtype">int</span> __numeric_traits_floating<_Value>::__digits10;
<a name="l00119"></a>00119
<a name="l00120"></a>00120 <span class="keyword">template</span><<span class="keyword">typename</span> _Value>
<a name="l00121"></a>00121 <span class="keyword">const</span> <span class="keywordtype">int</span> __numeric_traits_floating<_Value>::__max_exponent10;
<a name="l00122"></a>00122
<a name="l00123"></a>00123 <span class="keyword">template</span><<span class="keyword">typename</span> _Value>
<a name="l00124"></a>00124 <span class="keyword">struct </span>__numeric_traits
<a name="l00125"></a>00125 : <span class="keyword">public</span> __conditional_type<std::__is_integer<_Value>::__value,
<a name="l00126"></a>00126 __numeric_traits_integer<_Value>,
<a name="l00127"></a>00127 __numeric_traits_floating<_Value> >::__type
<a name="l00128"></a>00128 { };
<a name="l00129"></a>00129
<a name="l00130"></a>00130 _GLIBCXX_END_NAMESPACE_VERSION
<a name="l00131"></a>00131 } <span class="comment">// namespace</span>
<a name="l00132"></a>00132
<a name="l00133"></a>00133 <span class="preprocessor">#undef __glibcxx_floating</span>
<a name="l00134"></a>00134 <span class="preprocessor"></span><span class="preprocessor">#undef __glibcxx_max_digits10</span>
<a name="l00135"></a>00135 <span class="preprocessor"></span><span class="preprocessor">#undef __glibcxx_digits10</span>
<a name="l00136"></a>00136 <span class="preprocessor"></span><span class="preprocessor">#undef __glibcxx_max_exponent10</span>
<a name="l00137"></a>00137 <span class="preprocessor"></span>
<a name="l00138"></a>00138 <span class="preprocessor">#endif </span>
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