| #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 |