LCOV - code coverage report
Current view: directory - tools/gcc-4.5/include/c++/4.5.2/ext - type_traits.h (source / functions) Found Hit Coverage
Test: app.info Lines: 4 2 50.0 %
Date: 2012-06-02 Functions: 11 1 9.1 %

       1                 : // -*- C++ -*-
       2                 : 
       3                 : // Copyright (C) 2005, 2006, 2007, 2009 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 3, 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                 : // Under Section 7 of GPL version 3, you are granted additional
      17                 : // permissions described in the GCC Runtime Library Exception, version
      18                 : // 3.1, as published by the Free Software Foundation.
      19                 : 
      20                 : // You should have received a copy of the GNU General Public License and
      21                 : // a copy of the GCC Runtime Library Exception along with this program;
      22                 : // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      23                 : // <http://www.gnu.org/licenses/>.
      24                 : 
      25                 : /** @file ext/type_traits.h
      26                 :  *  This file is a GNU extension to the Standard C++ Library.
      27                 :  */
      28                 : 
      29                 : #ifndef _EXT_TYPE_TRAITS
      30                 : #define _EXT_TYPE_TRAITS 1
      31                 : 
      32                 : #pragma GCC system_header
      33                 : 
      34                 : #include <bits/c++config.h>
      35                 : #include <bits/cpp_type_traits.h>
      36                 : 
      37                 : _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
      38                 : 
      39                 :   // Define a nested type if some predicate holds.
      40                 :   template<bool, typename>
      41                 :     struct __enable_if 
      42                 :     { };
      43                 : 
      44                 :   template<typename _Tp>
      45                 :     struct __enable_if<true, _Tp>
      46                 :     { typedef _Tp __type; };
      47                 : 
      48                 : 
      49                 :   // Conditional expression for types. If true, first, if false, second.
      50                 :   template<bool _Cond, typename _Iftrue, typename _Iffalse>
      51                 :     struct __conditional_type
      52                 :     { typedef _Iftrue __type; };
      53                 : 
      54                 :   template<typename _Iftrue, typename _Iffalse>
      55                 :     struct __conditional_type<false, _Iftrue, _Iffalse>
      56                 :     { typedef _Iffalse __type; };
      57                 : 
      58                 : 
      59                 :   // Given an integral builtin type, return the corresponding unsigned type.
      60                 :   template<typename _Tp>
      61                 :     struct __add_unsigned
      62                 :     { 
      63                 :     private:
      64                 :       typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type;
      65                 :       
      66                 :     public:
      67                 :       typedef typename __if_type::__type __type; 
      68                 :     };
      69                 : 
      70                 :   template<>
      71                 :     struct __add_unsigned<char>
      72                 :     { typedef unsigned char __type; };
      73                 : 
      74                 :   template<>
      75                 :     struct __add_unsigned<signed char>
      76                 :     { typedef unsigned char __type; };
      77                 : 
      78                 :   template<>
      79                 :     struct __add_unsigned<short>
      80                 :     { typedef unsigned short __type; };
      81                 : 
      82                 :   template<>
      83                 :     struct __add_unsigned<int>
      84                 :     { typedef unsigned int __type; };
      85                 : 
      86                 :   template<>
      87                 :     struct __add_unsigned<long>
      88                 :     { typedef unsigned long __type; };
      89                 : 
      90                 :   template<>
      91                 :     struct __add_unsigned<long long>
      92                 :     { typedef unsigned long long __type; };
      93                 : 
      94                 :   // Declare but don't define.
      95                 :   template<>
      96                 :     struct __add_unsigned<bool>;
      97                 : 
      98                 :   template<>
      99                 :     struct __add_unsigned<wchar_t>;
     100                 : 
     101                 : 
     102                 :   // Given an integral builtin type, return the corresponding signed type.
     103                 :   template<typename _Tp>
     104                 :     struct __remove_unsigned
     105                 :     { 
     106                 :     private:
     107                 :       typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type;
     108                 :       
     109                 :     public:
     110                 :       typedef typename __if_type::__type __type; 
     111                 :     };
     112                 : 
     113                 :   template<>
     114                 :     struct __remove_unsigned<char>
     115                 :     { typedef signed char __type; };
     116                 : 
     117                 :   template<>
     118                 :     struct __remove_unsigned<unsigned char>
     119                 :     { typedef signed char __type; };
     120                 : 
     121                 :   template<>
     122                 :     struct __remove_unsigned<unsigned short>
     123                 :     { typedef short __type; };
     124                 : 
     125                 :   template<>
     126                 :     struct __remove_unsigned<unsigned int>
     127                 :     { typedef int __type; };
     128                 : 
     129                 :   template<>
     130                 :     struct __remove_unsigned<unsigned long>
     131                 :     { typedef long __type; };
     132                 : 
     133                 :   template<>
     134                 :     struct __remove_unsigned<unsigned long long>
     135                 :     { typedef long long __type; };
     136                 : 
     137                 :   // Declare but don't define.
     138                 :   template<>
     139                 :     struct __remove_unsigned<bool>;
     140                 : 
     141                 :   template<>
     142                 :     struct __remove_unsigned<wchar_t>;
     143                 : 
     144                 : 
     145                 :   // For use in string and vstring.
     146                 :   template<typename _Type>
     147                 :     inline bool
     148               0 :     __is_null_pointer(_Type* __ptr)
     149               0 :     { return __ptr == 0; }
     150                 : 
     151                 :   template<typename _Type>
     152                 :     inline bool
     153               2 :     __is_null_pointer(_Type)
     154               2 :     { return false; }
     155                 : 
     156                 : 
     157                 :   // For complex and cmath
     158                 :   template<typename _Tp, bool = std::__is_integer<_Tp>::__value>
     159                 :     struct __promote
     160                 :     { typedef double __type; };
     161                 : 
     162                 :   template<typename _Tp>
     163                 :     struct __promote<_Tp, false>
     164                 :     { typedef _Tp __type; };
     165                 : 
     166                 :   template<typename _Tp, typename _Up>
     167                 :     struct __promote_2
     168                 :     {
     169                 :     private:
     170                 :       typedef typename __promote<_Tp>::__type __type1;
     171                 :       typedef typename __promote<_Up>::__type __type2;
     172                 : 
     173                 :     public:
     174                 :       typedef __typeof__(__type1() + __type2()) __type;
     175                 :     };
     176                 : 
     177                 :   template<typename _Tp, typename _Up, typename _Vp>
     178                 :     struct __promote_3
     179                 :     {
     180                 :     private:
     181                 :       typedef typename __promote<_Tp>::__type __type1;
     182                 :       typedef typename __promote<_Up>::__type __type2;
     183                 :       typedef typename __promote<_Vp>::__type __type3;
     184                 : 
     185                 :     public:
     186                 :       typedef __typeof__(__type1() + __type2() + __type3()) __type;
     187                 :     };
     188                 : 
     189                 :   template<typename _Tp, typename _Up, typename _Vp, typename _Wp>
     190                 :     struct __promote_4
     191                 :     {
     192                 :     private:
     193                 :       typedef typename __promote<_Tp>::__type __type1;
     194                 :       typedef typename __promote<_Up>::__type __type2;
     195                 :       typedef typename __promote<_Vp>::__type __type3;
     196                 :       typedef typename __promote<_Wp>::__type __type4;
     197                 : 
     198                 :     public:
     199                 :       typedef __typeof__(__type1() + __type2() + __type3() + __type4()) __type;
     200                 :     };
     201                 : 
     202                 : _GLIBCXX_END_NAMESPACE
     203                 : 
     204                 : #endif 

Generated by: LCOV version 1.7