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 namespace boost 27 { 28 29 namespace detail 30 { 31 32 class BOOST_SYMBOL_VISIBLE sp_counted_base 33 { 34 private: 35 36 sp_counted_base( sp_counted_base const & ); 37 sp_counted_base & operator= ( sp_counted_base const & ); 38 39 boost::int_least32_t use_count_; // #shared 40 boost::int_least32_t weak_count_; // #weak + (#shared != 0) 41 42 public: 43 sp_counted_base()44 sp_counted_base() BOOST_SP_NOEXCEPT: use_count_( 1 ), weak_count_( 1 ) 45 { 46 } 47 ~sp_counted_base()48 virtual ~sp_counted_base() /*BOOST_SP_NOEXCEPT*/ 49 { 50 } 51 52 // dispose() is called when use_count_ drops to zero, to release 53 // the resources managed by *this. 54 55 virtual void dispose() BOOST_SP_NOEXCEPT = 0; // nothrow 56 57 // destroy() is called when weak_count_ drops to zero. 58 destroy()59 virtual void destroy() BOOST_SP_NOEXCEPT // nothrow 60 { 61 delete this; 62 } 63 64 virtual void * get_deleter( sp_typeinfo_ const & ti ) BOOST_SP_NOEXCEPT = 0; 65 virtual void * get_local_deleter( sp_typeinfo_ const & ti ) BOOST_SP_NOEXCEPT = 0; 66 virtual void * get_untyped_deleter() BOOST_SP_NOEXCEPT = 0; 67 add_ref_copy()68 void add_ref_copy() BOOST_SP_NOEXCEPT 69 { 70 ++use_count_; 71 } 72 add_ref_lock()73 bool add_ref_lock() BOOST_SP_NOEXCEPT // true on success 74 { 75 if( use_count_ == 0 ) return false; 76 ++use_count_; 77 return true; 78 } 79 release()80 void release() BOOST_SP_NOEXCEPT 81 { 82 if( --use_count_ == 0 ) 83 { 84 dispose(); 85 weak_release(); 86 } 87 } 88 weak_add_ref()89 void weak_add_ref() BOOST_SP_NOEXCEPT 90 { 91 ++weak_count_; 92 } 93 weak_release()94 void weak_release() BOOST_SP_NOEXCEPT 95 { 96 if( --weak_count_ == 0 ) 97 { 98 destroy(); 99 } 100 } 101 use_count() const102 long use_count() const BOOST_SP_NOEXCEPT 103 { 104 return use_count_; 105 } 106 }; 107 108 } // namespace detail 109 110 } // namespace boost 111 112 #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_NT_HPP_INCLUDED 113