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 sp_counted_base()41 sp_counted_base(): use_count_( 1 ), weak_count_( 1 ) 42 { 43 } 44 ~sp_counted_base()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 destroy()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_untyped_deleter() = 0; 63 add_ref_copy()64 void add_ref_copy() 65 { 66 ++use_count_; 67 } 68 add_ref_lock()69 bool add_ref_lock() // true on success 70 { 71 if( use_count_ == 0 ) return false; 72 ++use_count_; 73 return true; 74 } 75 release()76 void release() // nothrow 77 { 78 if( --use_count_ == 0 ) 79 { 80 dispose(); 81 weak_release(); 82 } 83 } 84 weak_add_ref()85 void weak_add_ref() // nothrow 86 { 87 ++weak_count_; 88 } 89 weak_release()90 void weak_release() // nothrow 91 { 92 if( --weak_count_ == 0 ) 93 { 94 destroy(); 95 } 96 } 97 use_count() const98 long use_count() const // nothrow 99 { 100 return use_count_; 101 } 102 }; 103 104 } // namespace detail 105 106 } // namespace boost 107 108 #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_NT_HPP_INCLUDED 109