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Diffstat (limited to 'src/boost/shared_ptr.hpp')
| -rw-r--r-- | src/boost/shared_ptr.hpp | 474 |
1 files changed, 474 insertions, 0 deletions
diff --git a/src/boost/shared_ptr.hpp b/src/boost/shared_ptr.hpp new file mode 100644 index 000000000..1a627774e --- /dev/null +++ b/src/boost/shared_ptr.hpp @@ -0,0 +1,474 @@ +#ifndef BOOST_SHARED_PTR_HPP_INCLUDED +#define BOOST_SHARED_PTR_HPP_INCLUDED + +// +// shared_ptr.hpp +// +// (C) Copyright Greg Colvin and Beman Dawes 1998, 1999. +// Copyright (c) 2001, 2002, 2003 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. +// +// See http://www.boost.org/libs/smart_ptr/shared_ptr.htm for documentation. +// + +//#include <boost/config.hpp> // for broken compiler workarounds + +#if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES) +#include <boost/detail/shared_ptr_nmt.hpp> +#else + +#include <boost/assert.hpp> +#include <boost/checked_delete.hpp> +#include <boost/throw_exception.hpp> +#include <boost/detail/shared_count.hpp> +#include <boost/detail/workaround.hpp> + +#include <memory> // for std::auto_ptr +#include <algorithm> // for std::swap +#include <functional> // for std::less +#include <typeinfo> // for std::bad_cast +#include <iosfwd> // for std::basic_ostream + +#ifdef BOOST_MSVC // moved here to work around VC++ compiler crash +# pragma warning(push) +# pragma warning(disable:4284) // odd return type for operator-> +#endif + +namespace boost +{ + +template<class T> class weak_ptr; +template<class T> class enable_shared_from_this; + +namespace detail +{ + +struct static_cast_tag {}; +struct const_cast_tag {}; +struct dynamic_cast_tag {}; +struct polymorphic_cast_tag {}; + +template<class T> struct shared_ptr_traits +{ + typedef T & reference; +}; + +template<> struct shared_ptr_traits<void> +{ + typedef void reference; +}; + +#if !defined(BOOST_NO_CV_VOID_SPECIALIZATIONS) + +template<> struct shared_ptr_traits<void const> +{ + typedef void reference; +}; + +template<> struct shared_ptr_traits<void volatile> +{ + typedef void reference; +}; + +template<> struct shared_ptr_traits<void const volatile> +{ + typedef void reference; +}; + +#endif + +// enable_shared_from_this support + +template<class T, class Y> void sp_enable_shared_from_this(boost::enable_shared_from_this<T> * pe, Y * px, shared_count const & pn) +{ + if(pe != 0) pe->_internal_weak_this._internal_assign(px, pn); +} + +inline void sp_enable_shared_from_this(void const volatile *, void const volatile *, shared_count const &) +{ +} + +} // namespace detail + + +// +// shared_ptr +// +// An enhanced relative of scoped_ptr with reference counted copy semantics. +// The object pointed to is deleted when the last shared_ptr pointing to it +// is destroyed or reset. +// + +template<class T> class shared_ptr +{ +private: + + // Borland 5.5.1 specific workaround + typedef shared_ptr<T> this_type; + +public: + + typedef T element_type; + typedef T value_type; + typedef T * pointer; + typedef typename detail::shared_ptr_traits<T>::reference reference; + + shared_ptr(): px(0), pn() // never throws in 1.30+ + { + } + + template<class Y> + explicit shared_ptr(Y * p): px(p), pn(p, checked_deleter<Y>()) // Y must be complete + { + detail::sp_enable_shared_from_this(p, p, pn); + } + + // + // Requirements: D's copy constructor must not throw + // + // shared_ptr will release p by calling d(p) + // + + template<class Y, class D> shared_ptr(Y * p, D d): px(p), pn(p, d) + { + detail::sp_enable_shared_from_this(p, p, pn); + } + +// generated copy constructor, assignment, destructor are fine... + +// except that Borland C++ has a bug, and g++ with -Wsynth warns +#if defined(__BORLANDC__) || defined(__GNUC__) + + shared_ptr & operator=(shared_ptr const & r) // never throws + { + px = r.px; + pn = r.pn; // shared_count::op= doesn't throw + return *this; + } + +#endif + + template<class Y> + explicit shared_ptr(weak_ptr<Y> const & r): pn(r.pn) // may throw + { + // it is now safe to copy r.px, as pn(r.pn) did not throw + px = r.px; + } + + template<class Y> + shared_ptr(shared_ptr<Y> const & r): px(r.px), pn(r.pn) // never throws + { + } + + template<class Y> + shared_ptr(shared_ptr<Y> const & r, detail::static_cast_tag): px(static_cast<element_type *>(r.px)), pn(r.pn) + { + } + + template<class Y> + shared_ptr(shared_ptr<Y> const & r, detail::const_cast_tag): px(const_cast<element_type *>(r.px)), pn(r.pn) + { + } + + template<class Y> + shared_ptr(shared_ptr<Y> const & r, detail::dynamic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn) + { + if(px == 0) // need to allocate new counter -- the cast failed + { + pn = detail::shared_count(); + } + } + + template<class Y> + shared_ptr(shared_ptr<Y> const & r, detail::polymorphic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn) + { + if(px == 0) + { + boost::throw_exception(std::bad_cast()); + } + } + +#ifndef BOOST_NO_AUTO_PTR + + template<class Y> + explicit shared_ptr(std::auto_ptr<Y> & r): px(r.get()), pn() + { + Y * tmp = r.get(); + pn = detail::shared_count(r); + detail::sp_enable_shared_from_this(tmp, tmp, pn); + } + +#endif + +#if !defined(BOOST_MSVC) || (BOOST_MSVC > 1200) + + template<class Y> + shared_ptr & operator=(shared_ptr<Y> const & r) // never throws + { + px = r.px; + pn = r.pn; // shared_count::op= doesn't throw + return *this; + } + +#endif + +#ifndef BOOST_NO_AUTO_PTR + + template<class Y> + shared_ptr & operator=(std::auto_ptr<Y> & r) + { + this_type(r).swap(*this); + return *this; + } + +#endif + + void reset() // never throws in 1.30+ + { + this_type().swap(*this); + } + + template<class Y> void reset(Y * p) // Y must be complete + { + BOOST_ASSERT(p == 0 || p != px); // catch self-reset errors + this_type(p).swap(*this); + } + + template<class Y, class D> void reset(Y * p, D d) + { + this_type(p, d).swap(*this); + } + + reference operator* () const // never throws + { + BOOST_ASSERT(px != 0); + return *px; + } + + T * operator-> () const // never throws + { + BOOST_ASSERT(px != 0); + return px; + } + + T * get() const // never throws + { + return px; + } + + // implicit conversion to "bool" + +#if defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x530) + + operator bool () const + { + return px != 0; + } + +#elif defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003)) + typedef T * (this_type::*unspecified_bool_type)() const; + + operator unspecified_bool_type() const // never throws + { + return px == 0? 0: &this_type::get; + } + +#else + + typedef T * this_type::*unspecified_bool_type; + + operator unspecified_bool_type() const // never throws + { + return px == 0? 0: &this_type::px; + } + +#endif + + // operator! is redundant, but some compilers need it + + bool operator! () const // never throws + { + return px == 0; + } + + bool unique() const // never throws + { + return pn.unique(); + } + + long use_count() const // never throws + { + return pn.use_count(); + } + + void swap(shared_ptr<T> & other) // never throws + { + std::swap(px, other.px); + pn.swap(other.pn); + } + + template<class Y> bool _internal_less(shared_ptr<Y> const & rhs) const + { + return pn < rhs.pn; + } + + void * _internal_get_deleter(std::type_info const & ti) const + { + return pn.get_deleter(ti); + } + +// Tasteless as this may seem, making all members public allows member templates +// to work in the absence of member template friends. (Matthew Langston) + +#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS + +private: + + template<class Y> friend class shared_ptr; + template<class Y> friend class weak_ptr; + + +#endif + + T * px; // contained pointer + detail::shared_count pn; // reference counter + +}; // shared_ptr + +template<class T, class U> inline bool operator==(shared_ptr<T> const & a, shared_ptr<U> const & b) +{ + return a.get() == b.get(); +} + +template<class T, class U> inline bool operator!=(shared_ptr<T> const & a, shared_ptr<U> const & b) +{ + return a.get() != b.get(); +} + +#if __GNUC__ == 2 && __GNUC_MINOR__ <= 96 + +// Resolve the ambiguity between our op!= and the one in rel_ops + +template<class T> inline bool operator!=(shared_ptr<T> const & a, shared_ptr<T> const & b) +{ + return a.get() != b.get(); +} + +#endif + +template<class T, class U> inline bool operator<(shared_ptr<T> const & a, shared_ptr<U> const & b) +{ + return a._internal_less(b); +} + +template<class T> inline void swap(shared_ptr<T> & a, shared_ptr<T> & b) +{ + a.swap(b); +} + +template<class T, class U> shared_ptr<T> static_pointer_cast(shared_ptr<U> const & r) +{ + return shared_ptr<T>(r, detail::static_cast_tag()); +} + +template<class T, class U> shared_ptr<T> const_pointer_cast(shared_ptr<U> const & r) +{ + return shared_ptr<T>(r, detail::const_cast_tag()); +} + +template<class T, class U> shared_ptr<T> dynamic_pointer_cast(shared_ptr<U> const & r) +{ + return shared_ptr<T>(r, detail::dynamic_cast_tag()); +} + +// shared_*_cast names are deprecated. Use *_pointer_cast instead. + +template<class T, class U> shared_ptr<T> shared_static_cast(shared_ptr<U> const & r) +{ + return shared_ptr<T>(r, detail::static_cast_tag()); +} + +template<class T, class U> shared_ptr<T> shared_dynamic_cast(shared_ptr<U> const & r) +{ + return shared_ptr<T>(r, detail::dynamic_cast_tag()); +} + +template<class T, class U> shared_ptr<T> shared_polymorphic_cast(shared_ptr<U> const & r) +{ + return shared_ptr<T>(r, detail::polymorphic_cast_tag()); +} + +template<class T, class U> shared_ptr<T> shared_polymorphic_downcast(shared_ptr<U> const & r) +{ + BOOST_ASSERT(dynamic_cast<T *>(r.get()) == r.get()); + return shared_static_cast<T>(r); +} + +// get_pointer() enables boost::mem_fn to recognize shared_ptr + +template<class T> inline T * get_pointer(shared_ptr<T> const & p) +{ + return p.get(); +} + +// operator<< + +#if defined(__GNUC__) && (__GNUC__ < 3) + +template<class Y> std::ostream & operator<< (std::ostream & os, shared_ptr<Y> const & p) +{ + os << p.get(); + return os; +} + +#else + +# if defined(BOOST_MSVC) && BOOST_WORKAROUND(BOOST_MSVC, <= 1200 && __SGI_STL_PORT) +// MSVC6 has problems finding std::basic_ostream through the using declaration in namespace _STL +using std::basic_ostream; +template<class E, class T, class Y> basic_ostream<E, T> & operator<< (basic_ostream<E, T> & os, shared_ptr<Y> const & p) +# else +template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::basic_ostream<E, T> & os, shared_ptr<Y> const & p) +# endif +{ + os << p.get(); + return os; +} + +#endif + +// get_deleter (experimental) + +#if (defined(__GNUC__) && (__GNUC__ < 3)) || (defined(__EDG_VERSION__) && (__EDG_VERSION__ <= 238)) + +// g++ 2.9x doesn't allow static_cast<X const *>(void *) +// apparently EDG 2.38 also doesn't accept it + +template<class D, class T> D * get_deleter(shared_ptr<T> const & p) +{ + void const * q = p._internal_get_deleter(typeid(D)); + return const_cast<D *>(static_cast<D const *>(q)); +} + +#else + +template<class D, class T> D * get_deleter(shared_ptr<T> const & p) +{ + return static_cast<D *>(p._internal_get_deleter(typeid(D))); +} + +#endif + +} // namespace boost + +#ifdef BOOST_MSVC +# pragma warning(pop) +#endif + +#endif // #if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES) + +#endif // #ifndef BOOST_SHARED_PTR_HPP_INCLUDED |