LCOV - lcov.info - /usr/include/c++/4.3/ext/type_traits.h

LTP GCOV extension - code coverage report
Current view: | directory - usr/include/c++/4.3/ext - type_traits.h
Test: | lcov.info
Date: | 2008-08-14 |  | Instrumented lines: | 4
Code covered: | 50.0 % |  | Executed lines: | 2

           1                 : // -*- C++ -*-
           2                 :
           3                 : // Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
           4                 : //
           5                 : // This file is part of the GNU ISO C++ Library.  This library is free
           6                 : // software; you can redistribute it and/or modify it under the terms
           7                 : // of the GNU General Public License as published by the Free Software
           8                 : // Foundation; either version 2, or (at your option) any later
           9                 : // version.
          10                 :
          11                 : // This library is distributed in the hope that it will be useful, but
          12                 : // WITHOUT ANY WARRANTY; without even the implied warranty of
          13                 : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
          14                 : // General Public License for more details.
          15                 :
          16                 : // You should have received a copy of the GNU General Public License along
          17                 : // with this library; see the file COPYING.  If not, write to the Free
          18                 : // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
          19                 : // USA.
          20                 :
          21                 : // As a special exception, you may use this file as part of a free
          22                 : // software library without restriction.  Specifically, if other files
          23                 : // instantiate templates or use macros or inline functions from this
          24                 : // file, or you compile this file and link it with other files to
          25                 : // produce an executable, this file does not by itself cause the
          26                 : // resulting executable to be covered by the GNU General Public
          27                 : // License.  This exception does not however invalidate any other
          28                 : // reasons why the executable file might be covered by the GNU General
          29                 : // Public License.
          30                 :
          31                 : /** @file ext/type_traits.h
          32                 :  *  This file is a GNU extension to the Standard C++ Library.
          33                 :  */
          34                 :
          35                 : #ifndef _EXT_TYPE_TRAITS
          36                 : #define _EXT_TYPE_TRAITS 1
          37                 :
          38                 : #pragma GCC system_header
          39                 :
          40                 : #include <bits/c++config.h>
          41                 : #include <bits/cpp_type_traits.h>
          42                 :
          43                 : _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
          44                 :
          45                 :   // Define a nested type if some predicate holds.
          46                 :   template<bool, typename>
          47                 :     struct __enable_if
          48                 :     { };
          49                 :
          50                 :   template<typename _Tp>
          51                 :     struct __enable_if<true, _Tp>
          52                 :     { typedef _Tp __type; };
          53                 :
          54                 :
          55                 :   // Conditional expression for types. If true, first, if false, second.
          56                 :   template<bool _Cond, typename _Iftrue, typename _Iffalse>
          57                 :     struct __conditional_type
          58                 :     { typedef _Iftrue __type; };
          59                 :
          60                 :   template<typename _Iftrue, typename _Iffalse>
          61                 :     struct __conditional_type<false, _Iftrue, _Iffalse>
          62                 :     { typedef _Iffalse __type; };
          63                 :
          64                 :
          65                 :   // Given an integral builtin type, return the corresponding unsigned type.
          66                 :   template<typename _Tp>
          67                 :     struct __add_unsigned
          68                 :     {
          69                 :     private:
          70                 :       typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type;
          71                 :
          72                 :     public:
          73                 :       typedef typename __if_type::__type __type;
          74                 :     };
          75                 :
          76                 :   template<>
          77                 :     struct __add_unsigned<char>
          78                 :     { typedef unsigned char __type; };
          79                 :
          80                 :   template<>
          81                 :     struct __add_unsigned<signed char>
          82                 :     { typedef unsigned char __type; };
          83                 :
          84                 :   template<>
          85                 :     struct __add_unsigned<short>
          86                 :     { typedef unsigned short __type; };
          87                 :
          88                 :   template<>
          89                 :     struct __add_unsigned<int>
          90                 :     { typedef unsigned int __type; };
          91                 :
          92                 :   template<>
          93                 :     struct __add_unsigned<long>
          94                 :     { typedef unsigned long __type; };
          95                 :
          96                 :   template<>
          97                 :     struct __add_unsigned<long long>
          98                 :     { typedef unsigned long long __type; };
          99                 :
         100                 :   // Declare but don't define.
         101                 :   template<>
         102                 :     struct __add_unsigned<bool>;
         103                 :
         104                 :   template<>
         105                 :     struct __add_unsigned<wchar_t>;
         106                 :
         107                 :
         108                 :   // Given an integral builtin type, return the corresponding signed type.
         109                 :   template<typename _Tp>
         110                 :     struct __remove_unsigned
         111                 :     {
         112                 :     private:
         113                 :       typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type;
         114                 :
         115                 :     public:
         116                 :       typedef typename __if_type::__type __type;
         117                 :     };
         118                 :
         119                 :   template<>
         120                 :     struct __remove_unsigned<char>
         121                 :     { typedef signed char __type; };
         122                 :
         123                 :   template<>
         124                 :     struct __remove_unsigned<unsigned char>
         125                 :     { typedef signed char __type; };
         126                 :
         127                 :   template<>
         128                 :     struct __remove_unsigned<unsigned short>
         129                 :     { typedef short __type; };
         130                 :
         131                 :   template<>
         132                 :     struct __remove_unsigned<unsigned int>
         133                 :     { typedef int __type; };
         134                 :
         135                 :   template<>
         136                 :     struct __remove_unsigned<unsigned long>
         137                 :     { typedef long __type; };
         138                 :
         139                 :   template<>
         140                 :     struct __remove_unsigned<unsigned long long>
         141                 :     { typedef long long __type; };
         142                 :
         143                 :   // Declare but don't define.
         144                 :   template<>
         145                 :     struct __remove_unsigned<bool>;
         146                 :
         147                 :   template<>
         148                 :     struct __remove_unsigned<wchar_t>;
         149                 :
         150                 :
         151                 :   // For use in string and vstring.
         152                 :   template<typename _Type>
         153                 :     inline bool
         154               0 :     __is_null_pointer(_Type* __ptr)
         155               0 :     { return __ptr == 0; }
         156                 :
         157                 :   template<typename _Type>
         158                 :     inline bool
         159            1287 :     __is_null_pointer(_Type)
         160            1287 :     { return false; }
         161                 :
         162                 :
         163                 :   // For complex and cmath
         164                 :   template<typename _Tp, bool = std::__is_integer<_Tp>::__value>
         165                 :     struct __promote
         166                 :     { typedef double __type; };
         167                 :
         168                 :   template<typename _Tp>
         169                 :     struct __promote<_Tp, false>
         170                 :     { typedef _Tp __type; };
         171                 :
         172                 :   template<typename _Tp, typename _Up>
         173                 :     struct __promote_2
         174                 :     {
         175                 :     private:
         176                 :       typedef typename __promote<_Tp>::__type __type1;
         177                 :       typedef typename __promote<_Up>::__type __type2;
         178                 :
         179                 :     public:
         180                 :       typedef __typeof__(__type1() + __type2()) __type;
         181                 :     };
         182                 :
         183                 :   template<typename _Tp, typename _Up, typename _Vp>
         184                 :     struct __promote_3
         185                 :     {
         186                 :     private:
         187                 :       typedef typename __promote<_Tp>::__type __type1;
         188                 :       typedef typename __promote<_Up>::__type __type2;
         189                 :       typedef typename __promote<_Vp>::__type __type3;
         190                 :
         191                 :     public:
         192                 :       typedef __typeof__(__type1() + __type2() + __type3()) __type;
         193                 :     };
         194                 :
         195                 :   template<typename _Tp, typename _Up, typename _Vp, typename _Wp>
         196                 :     struct __promote_4
         197                 :     {
         198                 :     private:
         199                 :       typedef typename __promote<_Tp>::__type __type1;
         200                 :       typedef typename __promote<_Up>::__type __type2;
         201                 :       typedef typename __promote<_Vp>::__type __type3;
         202                 :       typedef typename __promote<_Wp>::__type __type4;
         203                 :
         204                 :     public:
         205                 :       typedef __typeof__(__type1() + __type2() + __type3() + __type4()) __type;
         206                 :     };
         207                 :
         208                 : _GLIBCXX_END_NAMESPACE
         209                 :
         210                 : #endif

Generated by: LTP GCOV extension version 1.6