boost/ptr_container/detail/scoped_deleter.hpp

   1 //
   2 // Boost.Pointer Container
   3 //
   4 //  Copyright Thorsten Ottosen 2003-2005. Use, modification and
   5 //  distribution is subject to the Boost Software License, Version
   6 //  1.0. (See accompanying file LICENSE_1_0.txt or copy at
   7 //  http://www.boost.org/LICENSE_1_0.txt)
   8 //
   9 // For more information, see http://www.boost.org/libs/ptr_container/
  10 //
  11
  12 #ifndef BOOST_PTR_CONTAINER_SCOPED_DELETER_HPP
  13 #define BOOST_PTR_CONTAINER_SCOPED_DELETER_HPP
  14
  15 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  16 # pragma once
  17 #endif
  18
  19 #include <iterator>
  20 #include <cstddef>
  21 #include <boost/scoped_array.hpp>
  22
  23 namespace boost
  24 {
  25
  26     namespace ptr_container_detail
  27     {
  28         template< class T, class CloneAllocator >
  29         class scoped_deleter
  30         {
  31             typedef std::size_t size_type;
  32             scoped_array<T*>  ptrs_;
  33             size_type         stored_;
  34             bool              released_;
  35
  36         public:
  37             scoped_deleter( T** a, size_type size )
  38                 : ptrs_( a ), stored_( size ), released_( false )
  39             {
  40                 BOOST_ASSERT( a );
  41             }
  42
  43             scoped_deleter( size_type size )
  44                 : ptrs_( new T*[size] ), stored_( 0 ),
  45                  released_( false )
  46             {
  47                 BOOST_ASSERT( size > 0 );
  48             }
  49
  50
  51
  52             scoped_deleter( size_type n, const T& x ) // strong
  53                 : ptrs_( new T*[n] ), stored_(0),
  54                   released_( false )
  55             {
  56                 for( size_type i = 0; i != n; i++ )
  57                     add( CloneAllocator::allocate_clone( &x ) );
  58                 BOOST_ASSERT( stored_ > 0 );
  59             }
  60
  61
  62
  63             template< class InputIterator >
  64             scoped_deleter ( InputIterator first, InputIterator last  ) // strong
  65                 : ptrs_( new T*[ std::distance(first,last) ] ),
  66                   stored_(0),
  67                   released_( false )
  68             {
  69                 for( ; first != last; ++first )
  70                     add( CloneAllocator::allocate_clone_from_iterator( first ) );
  71                 BOOST_ASSERT( stored_ > 0 );
  72             }
  73
  74
  75
  76             ~scoped_deleter()
  77             {
  78                 if ( !released_ )
  79                 {
  80                     for( size_type i = 0u; i != stored_; ++i )
  81                         CloneAllocator::deallocate_clone( ptrs_[i] );
  82                 }
  83             }
  84
  85
  86
  87             void add( T* t )
  88             {
  89                 BOOST_ASSERT( ptrs_.get() != 0 );
  90                 ptrs_[stored_] = t;
  91                 ++stored_;
  92             }
  93
  94
  95
  96             void release()
  97             {
  98                 released_ = true;
  99             }
 100
 101
 102
 103             T** begin()
 104             {
 105                 BOOST_ASSERT( ptrs_.get() != 0 );
 106                 return &ptrs_[0];
 107             }
 108
 109
 110
 111             T** end()
 112             {
 113                 BOOST_ASSERT( ptrs_.get() != 0 );
 114                 return &ptrs_[stored_];
 115             }
 116
 117         }; // class 'scoped_deleter'
 118     }
 119 }
 120
 121 #endif