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/smart_ptr/detail/sp_typeinfo_.hpp>
  22 #include <boost/smart_ptr/detail/sp_noexcept.hpp>
  23 #include <boost/config.hpp>
  24 #include <boost/cstdint.hpp>
  25
  26 #if defined(BOOST_SP_REPORT_IMPLEMENTATION)
  27
  28 #include <boost/config/pragma_message.hpp>
  29 BOOST_PRAGMA_MESSAGE("Using single-threaded, non-atomic sp_counted_base")
  30
  31 #endif
  32
  33 namespace boost
  34 {
  35
  36 namespace detail
  37 {
  38
  39 class BOOST_SYMBOL_VISIBLE sp_counted_base
  40 {
  41 private:
  42
  43     sp_counted_base( sp_counted_base const & );
  44     sp_counted_base & operator= ( sp_counted_base const & );
  45
  46     boost::int_least32_t use_count_;        // #shared
  47     boost::int_least32_t weak_count_;       // #weak + (#shared != 0)
  48
  49 public:
  50
  51     sp_counted_base() BOOST_SP_NOEXCEPT: use_count_( 1 ), weak_count_( 1 )
  52     {
  53     }
  54
  55     virtual ~sp_counted_base() /*BOOST_SP_NOEXCEPT*/
  56     {
  57     }
  58
  59     // dispose() is called when use_count_ drops to zero, to release
  60     // the resources managed by *this.
  61
  62     virtual void dispose() BOOST_SP_NOEXCEPT = 0; // nothrow
  63
  64     // destroy() is called when weak_count_ drops to zero.
  65
  66     virtual void destroy() BOOST_SP_NOEXCEPT // nothrow
  67     {
  68         delete this;
  69     }
  70
  71     virtual void * get_deleter( sp_typeinfo_ const & ti ) BOOST_SP_NOEXCEPT = 0;
  72     virtual void * get_local_deleter( sp_typeinfo_ const & ti ) BOOST_SP_NOEXCEPT = 0;
  73     virtual void * get_untyped_deleter() BOOST_SP_NOEXCEPT = 0;
  74
  75     void add_ref_copy() BOOST_SP_NOEXCEPT
  76     {
  77         ++use_count_;
  78     }
  79
  80     bool add_ref_lock() BOOST_SP_NOEXCEPT // true on success
  81     {
  82         if( use_count_ == 0 ) return false;
  83         ++use_count_;
  84         return true;
  85     }
  86
  87     void release() BOOST_SP_NOEXCEPT
  88     {
  89         if( --use_count_ == 0 )
  90         {
  91             dispose();
  92             weak_release();
  93         }
  94     }
  95
  96     void weak_add_ref() BOOST_SP_NOEXCEPT
  97     {
  98         ++weak_count_;
  99     }
 100
 101     void weak_release() BOOST_SP_NOEXCEPT
 102     {
 103         if( --weak_count_ == 0 )
 104         {
 105             destroy();
 106         }
 107     }
 108
 109     long use_count() const BOOST_SP_NOEXCEPT
 110     {
 111         return use_count_;
 112     }
 113 };
 114
 115 } // namespace detail
 116
 117 } // namespace boost
 118
 119 #endif  // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_NT_HPP_INCLUDED