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  1. // nonstandard construct and destroy functions -*- C++ -*-
  2.  
  3. // Copyright (C) 2001-2015 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. /*
  26.  *
  27.  * Copyright (c) 1994
  28.  * Hewlett-Packard Company
  29.  *
  30.  * Permission to use, copy, modify, distribute and sell this software
  31.  * and its documentation for any purpose is hereby granted without fee,
  32.  * provided that the above copyright notice appear in all copies and
  33.  * that both that copyright notice and this permission notice appear
  34.  * in supporting documentation.  Hewlett-Packard Company makes no
  35.  * representations about the suitability of this software for any
  36.  * purpose.  It is provided "as is" without express or implied warranty.
  37.  *
  38.  *
  39.  * Copyright (c) 1996,1997
  40.  * Silicon Graphics Computer Systems, Inc.
  41.  *
  42.  * Permission to use, copy, modify, distribute and sell this software
  43.  * and its documentation for any purpose is hereby granted without fee,
  44.  * provided that the above copyright notice appear in all copies and
  45.  * that both that copyright notice and this permission notice appear
  46.  * in supporting documentation.  Silicon Graphics makes no
  47.  * representations about the suitability of this software for any
  48.  * purpose.  It is provided "as is" without express or implied warranty.
  49.  */
  50.  
  51. /** @file bits/stl_construct.h
  52.  *  This is an internal header file, included by other library headers.
  53.  *  Do not attempt to use it directly. @headername{memory}
  54.  */
  55.  
  56. #ifndef _STL_CONSTRUCT_H
  57. #define _STL_CONSTRUCT_H 1
  58.  
  59. #include <new>
  60. #include <bits/move.h>
  61. #include <ext/alloc_traits.h>
  62.  
  63. namespace std _GLIBCXX_VISIBILITY(default)
  64. {
  65. _GLIBCXX_BEGIN_NAMESPACE_VERSION
  66.  
  67.   /**
  68.    * Constructs an object in existing memory by invoking an allocated
  69.    * object's constructor with an initializer.
  70.    */
  71. #if __cplusplus >= 201103L
  72.   template<typename _T1, typename... _Args>
  73.     inline void
  74.     _Construct(_T1* __p, _Args&&... __args)
  75.     { ::new(static_cast<void*>(__p)) _T1(std::forward<_Args>(__args)...); }
  76. #else
  77.   template<typename _T1, typename _T2>
  78.     inline void
  79.     _Construct(_T1* __p, const _T2& __value)
  80.     {
  81.       // _GLIBCXX_RESOLVE_LIB_DEFECTS
  82.       // 402. wrong new expression in [some_]allocator::construct
  83.       ::new(static_cast<void*>(__p)) _T1(__value);
  84.     }
  85. #endif
  86.  
  87.   /**
  88.    * Destroy the object pointed to by a pointer type.
  89.    */
  90.   template<typename _Tp>
  91.     inline void
  92.     _Destroy(_Tp* __pointer)
  93.     { __pointer->~_Tp(); }
  94.  
  95.   template<bool>
  96.     struct _Destroy_aux
  97.     {
  98.       template<typename _ForwardIterator>
  99.         static void
  100.         __destroy(_ForwardIterator __first, _ForwardIterator __last)
  101.         {
  102.           for (; __first != __last; ++__first)
  103.             std::_Destroy(std::__addressof(*__first));
  104.         }
  105.     };
  106.  
  107.   template<>
  108.     struct _Destroy_aux<true>
  109.     {
  110.       template<typename _ForwardIterator>
  111.         static void
  112.         __destroy(_ForwardIterator, _ForwardIterator) { }
  113.     };
  114.  
  115.   /**
  116.    * Destroy a range of objects.  If the value_type of the object has
  117.    * a trivial destructor, the compiler should optimize all of this
  118.    * away, otherwise the objects' destructors must be invoked.
  119.    */
  120.   template<typename _ForwardIterator>
  121.     inline void
  122.     _Destroy(_ForwardIterator __first, _ForwardIterator __last)
  123.     {
  124.       typedef typename iterator_traits<_ForwardIterator>::value_type
  125.                        _Value_type;
  126.       std::_Destroy_aux<__has_trivial_destructor(_Value_type)>::
  127.         __destroy(__first, __last);
  128.     }
  129.  
  130.   /**
  131.    * Destroy a range of objects using the supplied allocator.  For
  132.    * nondefault allocators we do not optimize away invocation of
  133.    * destroy() even if _Tp has a trivial destructor.
  134.    */
  135.  
  136.   template<typename _ForwardIterator, typename _Allocator>
  137.     void
  138.     _Destroy(_ForwardIterator __first, _ForwardIterator __last,
  139.              _Allocator& __alloc)
  140.     {
  141.       typedef __gnu_cxx::__alloc_traits<_Allocator> __traits;
  142.       for (; __first != __last; ++__first)
  143.         __traits::destroy(__alloc, std::__addressof(*__first));
  144.     }
  145.  
  146.   template<typename _ForwardIterator, typename _Tp>
  147.     inline void
  148.     _Destroy(_ForwardIterator __first, _ForwardIterator __last,
  149.              allocator<_Tp>&)
  150.     {
  151.       _Destroy(__first, __last);
  152.     }
  153.  
  154. _GLIBCXX_END_NAMESPACE_VERSION
  155. } // namespace std
  156.  
  157. #endif /* _STL_CONSTRUCT_H */
  158.  
  159.