LCOV - code coverage report
Current view: directory - tools/gcc-4.5/include/c++/4.5.2/bits - move.h (source / functions) Found Hit Coverage
Test: app.info Lines: 11 11 100.0 %
Date: 2012-06-02 Functions: 483 120 24.8 %

       1                 : // Move, forward and identity for C++0x + swap -*- C++ -*-
       2                 : 
       3                 : // Copyright (C) 2007, 2008, 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
       7                 : // terms of the GNU General Public License as published by the
       8                 : // Free Software Foundation; either version 3, or (at your option)
       9                 : // any later version.
      10                 : 
      11                 : // This library is distributed in the hope that it will be useful,
      12                 : // but WITHOUT ANY WARRANTY; without even the implied warranty of
      13                 : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14                 : // GNU 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 move.h
      26                 :  *  This is an internal header file, included by other library headers.
      27                 :  *  You should not attempt to use it directly.
      28                 :  */
      29                 : 
      30                 : #ifndef _MOVE_H
      31                 : #define _MOVE_H 1
      32                 : 
      33                 : #include <bits/c++config.h>
      34                 : #include <cstddef>
      35                 : #include <bits/concept_check.h>
      36                 : 
      37                 : #ifdef __GXX_EXPERIMENTAL_CXX0X__
      38                 : #include <type_traits> // Brings in std::declval too.
      39                 : 
      40                 : _GLIBCXX_BEGIN_NAMESPACE(std)
      41                 : 
      42                 :   /// identity
      43                 :   template<typename _Tp>
      44                 :     struct identity
      45                 :     {
      46                 :       typedef _Tp type;
      47                 :     };
      48                 : 
      49                 :   /// forward (as per N2835)
      50                 :   /// Forward lvalues as rvalues.
      51                 :   template<typename _Tp>
      52                 :     inline typename enable_if<!is_lvalue_reference<_Tp>::value, _Tp&&>::type
      53       148754942 :     forward(typename std::identity<_Tp>::type& __t)
      54       148754942 :     { return static_cast<_Tp&&>(__t); }
      55                 : 
      56                 :   /// Forward rvalues as rvalues.
      57                 :   template<typename _Tp>
      58                 :     inline typename enable_if<!is_lvalue_reference<_Tp>::value, _Tp&&>::type
      59                 :     forward(typename std::identity<_Tp>::type&& __t)
      60                 :     { return static_cast<_Tp&&>(__t); }
      61                 : 
      62                 :   // Forward lvalues as lvalues.
      63                 :   template<typename _Tp>
      64                 :     inline typename enable_if<is_lvalue_reference<_Tp>::value, _Tp>::type
      65        92927718 :     forward(typename std::identity<_Tp>::type __t)
      66        92927718 :     { return __t; }
      67                 : 
      68                 :   // Prevent forwarding rvalues as const lvalues.
      69                 :   template<typename _Tp>
      70                 :     inline typename enable_if<is_lvalue_reference<_Tp>::value, _Tp>::type
      71                 :     forward(typename std::remove_reference<_Tp>::type&& __t) = delete;
      72                 : 
      73                 :   /**
      74                 :    *  @brief Move a value.
      75                 :    *  @ingroup mutating_algorithms
      76                 :    *  @param  __t  A thing of arbitrary type.
      77                 :    *  @return Same, moved.
      78                 :   */
      79                 :   template<typename _Tp>
      80                 :     inline typename std::remove_reference<_Tp>::type&&
      81        46869215 :     move(_Tp&& __t)
      82        46869215 :     { return static_cast<typename std::remove_reference<_Tp>::type&&>(__t); }
      83                 : 
      84                 :   /// declval, from type_traits.
      85                 : 
      86                 : _GLIBCXX_END_NAMESPACE
      87                 : 
      88                 : #define _GLIBCXX_MOVE(_Tp) std::move(_Tp)
      89                 : #define _GLIBCXX_FORWARD(_Tp, __val) std::forward<_Tp>(__val)
      90                 : #else
      91                 : #define _GLIBCXX_MOVE(_Tp) (_Tp)
      92                 : #define _GLIBCXX_FORWARD(_Tp, __val) (__val)
      93                 : #endif
      94                 : 
      95                 : _GLIBCXX_BEGIN_NAMESPACE(std)
      96                 : 
      97                 :   /**
      98                 :    *  @brief Swaps two values.
      99                 :    *  @ingroup mutating_algorithms
     100                 :    *  @param  __a  A thing of arbitrary type.
     101                 :    *  @param  __b  Another thing of arbitrary type.
     102                 :    *  @return   Nothing.
     103                 :   */
     104                 :   template<typename _Tp>
     105                 :     inline void
     106         6036357 :     swap(_Tp& __a, _Tp& __b)
     107                 :     {
     108                 :       // concept requirements
     109                 :       __glibcxx_function_requires(_SGIAssignableConcept<_Tp>)
     110                 : 
     111         6036357 :       _Tp __tmp = _GLIBCXX_MOVE(__a);
     112         6036357 :       __a = _GLIBCXX_MOVE(__b);
     113         6036357 :       __b = _GLIBCXX_MOVE(__tmp);
     114         6036357 :     }
     115                 : 
     116                 :   // _GLIBCXX_RESOLVE_LIB_DEFECTS
     117                 :   // DR 809. std::swap should be overloaded for array types.
     118                 :   template<typename _Tp, size_t _Nm>
     119                 :     inline void
     120                 :     swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
     121                 :     {
     122                 :       for (size_t __n = 0; __n < _Nm; ++__n)
     123                 :         swap(__a[__n], __b[__n]);
     124                 :     }
     125                 : 
     126                 : _GLIBCXX_END_NAMESPACE
     127                 : 
     128                 : #endif /* _MOVE_H */

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