LCOV - code coverage report
Current view: top level - usr/include/c++/6/bits - move.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 11 11 100.0 %
Date: 2018-11-14 16:53:58 Functions: 240 673 35.7 %

          Line data    Source code
       1             : // Move, forward and identity for C++0x + swap -*- C++ -*-
       2             : 
       3             : // Copyright (C) 2007-2016 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 bits/move.h
      26             :  *  This is an internal header file, included by other library headers.
      27             :  *  Do not attempt to use it directly. @headername{utility}
      28             :  */
      29             : 
      30             : #ifndef _MOVE_H
      31             : #define _MOVE_H 1
      32             : 
      33             : #include <bits/c++config.h>
      34             : #include <bits/concept_check.h>
      35             : 
      36             : namespace std _GLIBCXX_VISIBILITY(default)
      37             : {
      38             : _GLIBCXX_BEGIN_NAMESPACE_VERSION
      39             : 
      40             :   // Used, in C++03 mode too, by allocators, etc.
      41             :   /**
      42             :    *  @brief Same as C++11 std::addressof
      43             :    *  @ingroup utilities
      44             :    */
      45             :   template<typename _Tp>
      46             :     inline _Tp*
      47       29283 :     __addressof(_Tp& __r) _GLIBCXX_NOEXCEPT
      48             :     {
      49             :       return reinterpret_cast<_Tp*>
      50       29283 :         (&const_cast<char&>(reinterpret_cast<const volatile char&>(__r)));
      51             :     }
      52             : 
      53             : _GLIBCXX_END_NAMESPACE_VERSION
      54             : } // namespace
      55             : 
      56             : #if __cplusplus >= 201103L
      57             : #include <type_traits> // Brings in std::declval too.
      58             : 
      59             : namespace std _GLIBCXX_VISIBILITY(default)
      60             : {
      61             : _GLIBCXX_BEGIN_NAMESPACE_VERSION
      62             : 
      63             :   /**
      64             :    *  @addtogroup utilities
      65             :    *  @{
      66             :    */
      67             : 
      68             :   /**
      69             :    *  @brief  Forward an lvalue.
      70             :    *  @return The parameter cast to the specified type.
      71             :    *
      72             :    *  This function is used to implement "perfect forwarding".
      73             :    */
      74             :   template<typename _Tp>
      75             :     constexpr _Tp&&
      76       42453 :     forward(typename std::remove_reference<_Tp>::type& __t) noexcept
      77       42453 :     { return static_cast<_Tp&&>(__t); }
      78             : 
      79             :   /**
      80             :    *  @brief  Forward an rvalue.
      81             :    *  @return The parameter cast to the specified type.
      82             :    *
      83             :    *  This function is used to implement "perfect forwarding".
      84             :    */
      85             :   template<typename _Tp>
      86             :     constexpr _Tp&&
      87             :     forward(typename std::remove_reference<_Tp>::type&& __t) noexcept
      88             :     {
      89             :       static_assert(!std::is_lvalue_reference<_Tp>::value, "template argument"
      90             :                     " substituting _Tp is an lvalue reference type");
      91             :       return static_cast<_Tp&&>(__t);
      92             :     }
      93             : 
      94             :   /**
      95             :    *  @brief  Convert a value to an rvalue.
      96             :    *  @param  __t  A thing of arbitrary type.
      97             :    *  @return The parameter cast to an rvalue-reference to allow moving it.
      98             :   */
      99             :   template<typename _Tp>
     100             :     constexpr typename std::remove_reference<_Tp>::type&&
     101       15925 :     move(_Tp&& __t) noexcept
     102       15925 :     { return static_cast<typename std::remove_reference<_Tp>::type&&>(__t); }
     103             : 
     104             : 
     105             :   template<typename _Tp>
     106             :     struct __move_if_noexcept_cond
     107             :     : public __and_<__not_<is_nothrow_move_constructible<_Tp>>,
     108             :                     is_copy_constructible<_Tp>>::type { };
     109             : 
     110             :   /**
     111             :    *  @brief  Conditionally convert a value to an rvalue.
     112             :    *  @param  __x  A thing of arbitrary type.
     113             :    *  @return The parameter, possibly cast to an rvalue-reference.
     114             :    *
     115             :    *  Same as std::move unless the type's move constructor could throw and the
     116             :    *  type is copyable, in which case an lvalue-reference is returned instead.
     117             :    */
     118             :   template<typename _Tp>
     119             :     constexpr typename
     120             :     conditional<__move_if_noexcept_cond<_Tp>::value, const _Tp&, _Tp&&>::type
     121             :     move_if_noexcept(_Tp& __x) noexcept
     122             :     { return std::move(__x); }
     123             : 
     124             :   // declval, from type_traits.
     125             : 
     126             :   /**
     127             :    *  @brief Returns the actual address of the object or function
     128             :    *         referenced by r, even in the presence of an overloaded
     129             :    *         operator&.
     130             :    *  @param  __r  Reference to an object or function.
     131             :    *  @return   The actual address.
     132             :   */
     133             :   template<typename _Tp>
     134             :     inline _Tp*
     135             :     addressof(_Tp& __r) noexcept
     136             :     { return std::__addressof(__r); }
     137             : 
     138             :   // C++11 version of std::exchange for internal use.
     139             :   template <typename _Tp, typename _Up = _Tp>
     140             :     inline _Tp
     141             :     __exchange(_Tp& __obj, _Up&& __new_val)
     142             :     {
     143             :       _Tp __old_val = std::move(__obj);
     144             :       __obj = std::forward<_Up>(__new_val);
     145             :       return __old_val;
     146             :     }
     147             : 
     148             :   /// @} group utilities
     149             : _GLIBCXX_END_NAMESPACE_VERSION
     150             : } // namespace
     151             : 
     152             : #define _GLIBCXX_MOVE(__val) std::move(__val)
     153             : #define _GLIBCXX_FORWARD(_Tp, __val) std::forward<_Tp>(__val)
     154             : #else
     155             : #define _GLIBCXX_MOVE(__val) (__val)
     156             : #define _GLIBCXX_FORWARD(_Tp, __val) (__val)
     157             : #endif
     158             : 
     159             : namespace std _GLIBCXX_VISIBILITY(default)
     160             : {
     161             : _GLIBCXX_BEGIN_NAMESPACE_VERSION
     162             : 
     163             :   /**
     164             :    *  @addtogroup utilities
     165             :    *  @{
     166             :    */
     167             : 
     168             :   /**
     169             :    *  @brief Swaps two values.
     170             :    *  @param  __a  A thing of arbitrary type.
     171             :    *  @param  __b  Another thing of arbitrary type.
     172             :    *  @return   Nothing.
     173             :   */
     174             :   template<typename _Tp>
     175             :     inline
     176             : #if __cplusplus >= 201103L
     177             :     typename enable_if<__and_<is_move_constructible<_Tp>,
     178             :                               is_move_assignable<_Tp>>::value>::type
     179        1944 :     swap(_Tp& __a, _Tp& __b)
     180             :     noexcept(__and_<is_nothrow_move_constructible<_Tp>,
     181             :                     is_nothrow_move_assignable<_Tp>>::value)
     182             : #else
     183             :     void
     184             :     swap(_Tp& __a, _Tp& __b)
     185             : #endif
     186             :     {
     187             :       // concept requirements
     188             :       __glibcxx_function_requires(_SGIAssignableConcept<_Tp>)
     189             : 
     190        2003 :       _Tp __tmp = _GLIBCXX_MOVE(__a);
     191        1944 :       __a = _GLIBCXX_MOVE(__b);
     192        1944 :       __b = _GLIBCXX_MOVE(__tmp);
     193        1944 :     }
     194             : 
     195             :   // _GLIBCXX_RESOLVE_LIB_DEFECTS
     196             :   // DR 809. std::swap should be overloaded for array types.
     197             :   /// Swap the contents of two arrays.
     198             :   template<typename _Tp, size_t _Nm>
     199             :     inline
     200             : #if __cplusplus >= 201103L
     201             :     typename enable_if<__is_swappable<_Tp>::value>::type
     202             :     swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
     203             :     noexcept(__is_nothrow_swappable<_Tp>::value)
     204             : #else
     205             :     void
     206             :     swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
     207             : #endif
     208             :     {
     209             :       for (size_t __n = 0; __n < _Nm; ++__n)
     210             :         swap(__a[__n], __b[__n]);
     211             :     }
     212             : 
     213             :   /// @} group utilities
     214             : _GLIBCXX_END_NAMESPACE_VERSION
     215             : } // namespace
     216             : 
     217             : #endif /* _MOVE_H */

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