570 lines
13 KiB
C++
570 lines
13 KiB
C++
#ifndef BOOST_DETAIL_SHARED_COUNT_132_HPP_INCLUDED
|
|
#define BOOST_DETAIL_SHARED_COUNT_132_HPP_INCLUDED
|
|
|
|
// 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.
|
|
//
|
|
// 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.
|
|
#endif
|
|
|
|
#include <boost/checked_delete.hpp>
|
|
#include <boost/serialization/throw_exception.hpp>
|
|
#include <boost/detail/lightweight_mutex.hpp>
|
|
|
|
#if defined(BOOST_SP_USE_QUICK_ALLOCATOR)
|
|
#include <boost/detail/quick_allocator.hpp>
|
|
#endif
|
|
|
|
#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
|
|
|
|
#include <boost/config.hpp> // msvc 6.0 needs this for warning suppression
|
|
#if defined(BOOST_NO_STDC_NAMESPACE)
|
|
namespace std{
|
|
using ::size_t;
|
|
} // namespace std
|
|
#endif
|
|
|
|
#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_132 {
|
|
|
|
// 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 boost::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_copy()
|
|
{
|
|
#if defined(BOOST_HAS_THREADS)
|
|
mutex_type::scoped_lock lock(mtx_);
|
|
#endif
|
|
++use_count_;
|
|
}
|
|
|
|
void add_ref_lock()
|
|
{
|
|
#if defined(BOOST_HAS_THREADS)
|
|
mutex_type::scoped_lock lock(mtx_);
|
|
#endif
|
|
if(use_count_ == 0) boost::serialization::throw_exception(bad_weak_ptr());
|
|
++use_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) 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:
|
|
public:
|
|
sp_counted_base(sp_counted_base const &);
|
|
sp_counted_base & operator= (sp_counted_base const &);
|
|
|
|
long use_count_; // #shared
|
|
long weak_count_; // #weak + (#shared != 0)
|
|
|
|
#if defined(BOOST_HAS_THREADS) || defined(BOOST_LWM_WIN32)
|
|
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:
|
|
public:
|
|
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 boost::detail::quick_allocator<this_type>::alloc();
|
|
}
|
|
|
|
void operator delete(void * p)
|
|
{
|
|
boost::detail::quick_allocator<this_type>::dealloc(p);
|
|
}
|
|
|
|
#endif
|
|
};
|
|
|
|
#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
|
|
|
|
int const shared_count_id = 0x2C35F101;
|
|
int const weak_count_id = 0x298C38A4;
|
|
|
|
#endif
|
|
|
|
class weak_count;
|
|
|
|
class shared_count
|
|
{
|
|
//private:
|
|
public:
|
|
sp_counted_base * pi_;
|
|
|
|
#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
|
|
int id_;
|
|
#endif
|
|
|
|
friend class weak_count;
|
|
|
|
public:
|
|
|
|
shared_count(): pi_(0) // nothrow
|
|
#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
|
|
, id_(shared_count_id)
|
|
#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)
|
|
#endif
|
|
{
|
|
#ifndef BOOST_NO_EXCEPTIONS
|
|
|
|
try
|
|
{
|
|
pi_ = new sp_counted_base_impl<P, D>(p, d);
|
|
}
|
|
catch(...)
|
|
{
|
|
d(p); // delete p
|
|
throw;
|
|
}
|
|
|
|
#else
|
|
|
|
pi_ = new sp_counted_base_impl<P, D>(p, d);
|
|
|
|
if(pi_ == 0)
|
|
{
|
|
d(p); // delete p
|
|
boost::serialization::throw_exception(std::bad_alloc());
|
|
}
|
|
|
|
#endif
|
|
}
|
|
|
|
#ifndef BOOST_NO_AUTO_PTR
|
|
|
|
// 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 *,
|
|
boost::checked_deleter<Y>
|
|
>(r.get(), boost::checked_deleter<Y>()))
|
|
#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
|
|
, id_(shared_count_id)
|
|
#endif
|
|
{
|
|
r.release();
|
|
}
|
|
|
|
#endif
|
|
|
|
~shared_count() // nothrow
|
|
{
|
|
if(pi_ != 0) pi_->release();
|
|
#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
|
|
id_ = 0;
|
|
#endif
|
|
}
|
|
|
|
shared_count(shared_count const & r): pi_(r.pi_) // nothrow
|
|
#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
|
|
, id_(shared_count_id)
|
|
#endif
|
|
{
|
|
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 != pi_)
|
|
{
|
|
if(tmp != 0) tmp->add_ref_copy();
|
|
if(pi_ != 0) pi_->release();
|
|
pi_ = tmp;
|
|
}
|
|
|
|
return *this;
|
|
}
|
|
|
|
void swap(shared_count & r) // nothrow
|
|
{
|
|
sp_counted_base * tmp = r.pi_;
|
|
r.pi_ = pi_;
|
|
pi_ = tmp;
|
|
}
|
|
|
|
long use_count() const // nothrow
|
|
{
|
|
return pi_ != 0? pi_->use_count(): 0;
|
|
}
|
|
|
|
bool unique() const // nothrow
|
|
{
|
|
return use_count() == 1;
|
|
}
|
|
|
|
friend inline bool operator==(shared_count const & a, shared_count const & b)
|
|
{
|
|
return a.pi_ == b.pi_;
|
|
}
|
|
|
|
friend inline bool operator<(shared_count const & a, shared_count const & b)
|
|
{
|
|
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;
|
|
}
|
|
};
|
|
|
|
#ifdef __CODEGUARD__
|
|
# pragma option pop
|
|
#endif
|
|
|
|
|
|
class weak_count
|
|
{
|
|
private:
|
|
|
|
sp_counted_base * pi_;
|
|
|
|
#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
|
|
int id_;
|
|
#endif
|
|
|
|
friend class shared_count;
|
|
|
|
public:
|
|
|
|
weak_count(): pi_(0) // nothrow
|
|
#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
|
|
, id_(weak_count_id)
|
|
#endif
|
|
{
|
|
}
|
|
|
|
weak_count(shared_count const & r): pi_(r.pi_) // nothrow
|
|
#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
|
|
, id_(shared_count_id)
|
|
#endif
|
|
{
|
|
if(pi_ != 0) pi_->weak_add_ref();
|
|
}
|
|
|
|
weak_count(weak_count const & r): pi_(r.pi_) // nothrow
|
|
#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
|
|
, id_(shared_count_id)
|
|
#endif
|
|
{
|
|
if(pi_ != 0) pi_->weak_add_ref();
|
|
}
|
|
|
|
~weak_count() // nothrow
|
|
{
|
|
if(pi_ != 0) pi_->weak_release();
|
|
#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
|
|
id_ = 0;
|
|
#endif
|
|
}
|
|
|
|
weak_count & operator= (shared_count const & r) // nothrow
|
|
{
|
|
sp_counted_base * tmp = r.pi_;
|
|
if(tmp != 0) tmp->weak_add_ref();
|
|
if(pi_ != 0) pi_->weak_release();
|
|
pi_ = tmp;
|
|
|
|
return *this;
|
|
}
|
|
|
|
weak_count & operator= (weak_count const & r) // nothrow
|
|
{
|
|
sp_counted_base * tmp = r.pi_;
|
|
if(tmp != 0) tmp->weak_add_ref();
|
|
if(pi_ != 0) pi_->weak_release();
|
|
pi_ = tmp;
|
|
|
|
return *this;
|
|
}
|
|
|
|
void swap(weak_count & r) // nothrow
|
|
{
|
|
sp_counted_base * tmp = r.pi_;
|
|
r.pi_ = pi_;
|
|
pi_ = tmp;
|
|
}
|
|
|
|
long use_count() const // nothrow
|
|
{
|
|
return pi_ != 0? pi_->use_count(): 0;
|
|
}
|
|
|
|
friend inline bool operator==(weak_count const & a, weak_count const & b)
|
|
{
|
|
return a.pi_ == b.pi_;
|
|
}
|
|
|
|
friend inline bool operator<(weak_count const & a, weak_count const & b)
|
|
{
|
|
return std::less<sp_counted_base *>()(a.pi_, b.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_lock();
|
|
}
|
|
else
|
|
{
|
|
boost::serialization::throw_exception(bad_weak_ptr());
|
|
}
|
|
}
|
|
|
|
} // namespace detail
|
|
|
|
} // namespace boost
|
|
|
|
BOOST_SERIALIZATION_ASSUME_ABSTRACT(boost_132::detail::sp_counted_base)
|
|
|
|
#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
|