ceph/src/boost/boost/smart_ptr/detail/sp_counted_base_nt.hpp

   1 #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_NT_HPP_INCLUDED
   2 #define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_NT_HPP_INCLUDED
   3
   4 // MS compatible compilers support #pragma once
   5
   6 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
   7 # pragma once
   8 #endif
   9
  10 //
  11 //  detail/sp_counted_base_nt.hpp
  12 //
  13 //  Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
  14 //  Copyright 2004-2005 Peter Dimov
  15 //
  16 // Distributed under the Boost Software License, Version 1.0. (See
  17 // accompanying file LICENSE_1_0.txt or copy at
  18 // http://www.boost.org/LICENSE_1_0.txt)
  19 //
  20
  21 #include <boost/detail/sp_typeinfo.hpp>
  22
  23 namespace boost
  24 {
  25
  26 namespace detail
  27 {
  28
  29 class sp_counted_base
  30 {
  31 private:
  32
  33     sp_counted_base( sp_counted_base const & );
  34     sp_counted_base & operator= ( sp_counted_base const & );
  35
  36     long use_count_;        // #shared
  37     long weak_count_;       // #weak + (#shared != 0)
  38
  39 public:
  40
  41     sp_counted_base(): use_count_( 1 ), weak_count_( 1 )
  42     {
  43     }
  44
  45     virtual ~sp_counted_base() // nothrow
  46     {
  47     }
  48
  49     // dispose() is called when use_count_ drops to zero, to release
  50     // the resources managed by *this.
  51
  52     virtual void dispose() = 0; // nothrow
  53
  54     // destroy() is called when weak_count_ drops to zero.
  55
  56     virtual void destroy() // nothrow
  57     {
  58         delete this;
  59     }
  60
  61     virtual void * get_deleter( sp_typeinfo const & ti ) = 0;
  62     virtual void * get_local_deleter( sp_typeinfo const & ti ) = 0;
  63     virtual void * get_untyped_deleter() = 0;
  64
  65     void add_ref_copy()
  66     {
  67         ++use_count_;
  68     }
  69
  70     bool add_ref_lock() // true on success
  71     {
  72         if( use_count_ == 0 ) return false;
  73         ++use_count_;
  74         return true;
  75     }
  76
  77     void release() // nothrow
  78     {
  79         if( --use_count_ == 0 )
  80         {
  81             dispose();
  82             weak_release();
  83         }
  84     }
  85
  86     void weak_add_ref() // nothrow
  87     {
  88         ++weak_count_;
  89     }
  90
  91     void weak_release() // nothrow
  92     {
  93         if( --weak_count_ == 0 )
  94         {
  95             destroy();
  96         }
  97     }
  98
  99     long use_count() const // nothrow
 100     {
 101         return use_count_;
 102     }
 103 };
 104
 105 } // namespace detail
 106
 107 } // namespace boost
 108
 109 #endif  // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_NT_HPP_INCLUDED