#ifndef BOOST_DETAIL_SHARED_COUNT_HPP_INCLUDED
#define BOOST_DETAIL_SHARED_COUNT_HPP_INCLUDED
-#if _MSC_VER >= 1020
-#pragma once
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
#endif
//
// detail/shared_count.hpp
//
// Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
+// Copyright 2004-2005 Peter Dimov
//
-// Permission to copy, use, modify, sell and distribute this software
-// is granted provided this copyright notice appears in all copies.
-// This software is provided "as is" without express or implied
-// warranty, and with no claim as to its suitability for any purpose.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
//
-#include <boost/config.hpp>
-
-#if defined(BOOST_SP_USE_STD_ALLOCATOR) && defined(BOOST_SP_USE_QUICK_ALLOCATOR)
-# error BOOST_SP_USE_STD_ALLOCATOR and BOOST_SP_USE_QUICK_ALLOCATOR are incompatible.
+#ifdef __BORLANDC__
+# pragma warn -8027 // Functions containing try are not expanded inline
#endif
+#include <boost/config.hpp>
#include <boost/checked_delete.hpp>
#include <boost/throw_exception.hpp>
-#include <boost/detail/lightweight_mutex.hpp>
-
-#if defined(BOOST_SP_USE_QUICK_ALLOCATOR)
-#include <boost/detail/quick_allocator.hpp>
-#endif
+#include <boost/detail/bad_weak_ptr.hpp>
+#include <boost/detail/sp_counted_base.hpp>
+#include <boost/detail/sp_counted_impl.hpp>
#include <memory> // std::auto_ptr, std::allocator
#include <functional> // std::less
-#include <exception> // std::exception
#include <new> // std::bad_alloc
#include <typeinfo> // std::type_info in get_deleter
-#include <cstddef> // std::size_t
-
-#ifdef __BORLANDC__
-# pragma warn -8026 // Functions with excep. spec. are not expanded inline
-# pragma warn -8027 // Functions containing try are not expanded inline
-#endif
namespace boost
{
-// Debug hooks
-
-#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
-
-void sp_scalar_constructor_hook(void * px, std::size_t size, void * pn);
-void sp_array_constructor_hook(void * px);
-void sp_scalar_destructor_hook(void * px, std::size_t size, void * pn);
-void sp_array_destructor_hook(void * px);
-
-#endif
-
-
-// The standard library that comes with Borland C++ 5.5.1
-// defines std::exception and its members as having C calling
-// convention (-pc). When the definition of bad_weak_ptr
-// is compiled with -ps, the compiler issues an error.
-// Hence, the temporary #pragma option -pc below. The version
-// check is deliberately conservative.
-
-#if defined(__BORLANDC__) && __BORLANDC__ == 0x551
-# pragma option push -pc
-#endif
-
-class bad_weak_ptr: public std::exception
-{
-public:
-
- virtual char const * what() const throw()
- {
- return "boost::bad_weak_ptr";
- }
-};
-
-#if defined(__BORLANDC__) && __BORLANDC__ == 0x551
-# pragma option pop
-#endif
-
namespace detail
{
-class sp_counted_base
-{
-private:
-
- typedef detail::lightweight_mutex mutex_type;
-
-public:
-
- sp_counted_base(): use_count_(1), weak_count_(1)
- {
- }
-
- virtual ~sp_counted_base() // nothrow
- {
- }
-
- // dispose() is called when use_count_ drops to zero, to release
- // the resources managed by *this.
-
- virtual void dispose() = 0; // nothrow
-
- // destruct() is called when weak_count_ drops to zero.
-
- virtual void destruct() // nothrow
- {
- delete this;
- }
-
- virtual void * get_deleter(std::type_info const & ti) = 0;
-
- void add_ref()
- {
-#if defined(BOOST_HAS_THREADS)
- mutex_type::scoped_lock lock(mtx_);
-#endif
- if(use_count_ == 0 && weak_count_ != 0) boost::throw_exception(boost::bad_weak_ptr());
- ++use_count_;
- ++weak_count_;
- }
-
- void release() // nothrow
- {
- {
-#if defined(BOOST_HAS_THREADS)
- mutex_type::scoped_lock lock(mtx_);
-#endif
- long new_use_count = --use_count_;
-
- if(new_use_count != 0)
- {
- --weak_count_;
- return;
- }
- }
-
- dispose();
- weak_release();
- }
-
- void weak_add_ref() // nothrow
- {
-#if defined(BOOST_HAS_THREADS)
- mutex_type::scoped_lock lock(mtx_);
-#endif
- ++weak_count_;
- }
-
- void weak_release() // nothrow
- {
- long new_weak_count;
-
- {
-#if defined(BOOST_HAS_THREADS)
- mutex_type::scoped_lock lock(mtx_);
-#endif
- new_weak_count = --weak_count_;
- }
-
- if(new_weak_count == 0)
- {
- destruct();
- }
- }
-
- long use_count() const // nothrow
- {
-#if defined(BOOST_HAS_THREADS)
- mutex_type::scoped_lock lock(mtx_);
-#endif
- return use_count_;
- }
-
-private:
-
- sp_counted_base(sp_counted_base const &);
- sp_counted_base & operator= (sp_counted_base const &);
-
- // inv: use_count_ <= weak_count_
-
- long use_count_;
- long weak_count_;
-
-#if defined(BOOST_HAS_THREADS)
- mutable mutex_type mtx_;
-#endif
-};
-
-#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
-
-template<class T> void cbi_call_constructor_hook(sp_counted_base * pn, T * px, checked_deleter<T> const &, int)
-{
- boost::sp_scalar_constructor_hook(px, sizeof(T), pn);
-}
-
-template<class T> void cbi_call_constructor_hook(sp_counted_base *, T * px, checked_array_deleter<T> const &, int)
-{
- boost::sp_array_constructor_hook(px);
-}
-
-template<class P, class D> void cbi_call_constructor_hook(sp_counted_base *, P const &, D const &, long)
-{
-}
-
-template<class T> void cbi_call_destructor_hook(sp_counted_base * pn, T * px, checked_deleter<T> const &, int)
-{
- boost::sp_scalar_destructor_hook(px, sizeof(T), pn);
-}
-
-template<class T> void cbi_call_destructor_hook(sp_counted_base *, T * px, checked_array_deleter<T> const &, int)
-{
- boost::sp_array_destructor_hook(px);
-}
-
-template<class P, class D> void cbi_call_destructor_hook(sp_counted_base *, P const &, D const &, long)
-{
-}
-
-#endif
-
-//
-// Borland's Codeguard trips up over the -Vx- option here:
-//
-#ifdef __CODEGUARD__
-# pragma option push -Vx-
-#endif
-
-template<class P, class D> class sp_counted_base_impl: public sp_counted_base
-{
-private:
-
- P ptr; // copy constructor must not throw
- D del; // copy constructor must not throw
-
- sp_counted_base_impl(sp_counted_base_impl const &);
- sp_counted_base_impl & operator= (sp_counted_base_impl const &);
-
- typedef sp_counted_base_impl<P, D> this_type;
-
-public:
-
- // pre: initial_use_count <= initial_weak_count, d(p) must not throw
-
- sp_counted_base_impl(P p, D d): ptr(p), del(d)
- {
-#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
- detail::cbi_call_constructor_hook(this, p, d, 0);
-#endif
- }
-
- virtual void dispose() // nothrow
- {
-#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
- detail::cbi_call_destructor_hook(this, ptr, del, 0);
-#endif
- del(ptr);
- }
-
- virtual void * get_deleter(std::type_info const & ti)
- {
- return ti == typeid(D)? &del: 0;
- }
-
-#if defined(BOOST_SP_USE_STD_ALLOCATOR)
-
- void * operator new(std::size_t)
- {
- return std::allocator<this_type>().allocate(1, static_cast<this_type *>(0));
- }
-
- void operator delete(void * p)
- {
- std::allocator<this_type>().deallocate(static_cast<this_type *>(p), 1);
- }
-
-#endif
-
-#if defined(BOOST_SP_USE_QUICK_ALLOCATOR)
-
- void * operator new(std::size_t)
- {
- return quick_allocator<this_type>::alloc();
- }
-
- void operator delete(void * p)
- {
- quick_allocator<this_type>::dealloc(p);
- }
-
-#endif
-};
-
#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
int const shared_count_id = 0x2C35F101;
{
}
+ template<class Y> explicit shared_count( Y * p ): pi_( 0 )
+#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
+ , id_(shared_count_id)
+#endif
+ {
+#ifndef BOOST_NO_EXCEPTIONS
+
+ try
+ {
+ pi_ = new sp_counted_impl_p<Y>( p );
+ }
+ catch(...)
+ {
+ boost::checked_delete( p );
+ throw;
+ }
+
+#else
+
+ pi_ = new sp_counted_impl_p<Y>( p );
+
+ if( pi_ == 0 )
+ {
+ boost::checked_delete( p );
+ boost::throw_exception( std::bad_alloc() );
+ }
+
+#endif
+ }
+
template<class P, class D> shared_count(P p, D d): pi_(0)
#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
, id_(shared_count_id)
try
{
- pi_ = new sp_counted_
base_impl<P, D>(p, d);
+ pi_ = new sp_counted_
impl_pd<P, D>(p, d);
}
catch(...)
{
#else
- pi_ = new sp_counted_
base_impl<P, D>(p, d);
+ pi_ = new sp_counted_
impl_pd<P, D>(p, d);
if(pi_ == 0)
{
// auto_ptr<Y> is special cased to provide the strong guarantee
template<class Y>
- explicit shared_count(std::auto_ptr<Y> & r): pi_(new sp_counted_base_impl< Y *, checked_deleter<Y> >(r.get(), checked_deleter<Y>()))
+ explicit shared_count( std::auto_ptr<Y> & r ): pi_( new sp_counted_impl_p<Y>( r.get() ) )
#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
, id_(shared_count_id)
#endif
{
+#ifdef BOOST_NO_EXCEPTIONS
+
+ if( pi_ == 0 )
+ {
+ boost::throw_exception(std::bad_alloc());
+ }
+
+#endif
+
r.release();
}
~shared_count() // nothrow
{
- if(pi_ != 0) pi_->release();
+ if( pi_ != 0 ) pi_->release();
#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
id_ = 0;
#endif
, id_(shared_count_id)
#endif
{
- if(pi_ != 0) pi_->add_ref();
+ if( pi_ != 0 ) pi_->add_ref_copy();
}
explicit shared_count(weak_count const & r); // throws bad_weak_ptr when r.use_count() == 0
shared_count & operator= (shared_count const & r) // nothrow
{
sp_counted_base * tmp = r.pi_;
- if(tmp != 0) tmp->add_ref();
- if(pi_ != 0) pi_->release();
- pi_ = tmp;
+
+ if( tmp != pi_ )
+ {
+ if( tmp != 0 ) tmp->add_ref_copy();
+ if( pi_ != 0 ) pi_->release();
+ pi_ = tmp;
+ }
return *this;
}
friend inline bool operator<(shared_count const & a, shared_count const & b)
{
- return std::less<sp_counted_base *>()(a.pi_, b.pi_);
+ return std::less<sp_counted_base *>()( a.pi_, b.pi_ );
}
void * get_deleter(std::type_info const & ti) const
{
- return pi_? pi_->get_deleter(ti): 0;
+ return pi_? pi_->get_deleter( ti ): 0;
}
};
-#ifdef __CODEGUARD__
-# pragma option pop
-#endif
-
class weak_count
{
}
};
-inline shared_count::shared_count(weak_count const & r): pi_(r.pi_)
+inline shared_count::shared_count( weak_count const & r ): pi_( r.pi_ )
#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
, id_(shared_count_id)
#endif
{
- if(pi_ != 0)
- {
- pi_->add_ref();
- }
- else
+ if( pi_ == 0 || !pi_->add_ref_lock() )
{
- boost::throw_exception(boost::bad_weak_ptr());
+ boost::throw_exception( boost::bad_weak_ptr() );
}
}
#ifdef __BORLANDC__
# pragma warn .8027 // Functions containing try are not expanded inline
-# pragma warn .8026 // Functions with excep. spec. are not expanded inline
#endif
#endif // #ifndef BOOST_DETAIL_SHARED_COUNT_HPP_INCLUDED
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