547 lines
19 KiB
C++
547 lines
19 KiB
C++
#ifndef BOOST_SIGNALS2_DECONSTRUCT_HPP
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#define BOOST_SIGNALS2_DECONSTRUCT_HPP
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// deconstruct.hpp
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//
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// A factory function for creating a shared_ptr which creates
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// an object and its owning shared_ptr with one allocation, similar
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// to make_shared<T>(). It also supports postconstructors
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// and predestructors through unqualified calls of adl_postconstruct() and
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// adl_predestruct, relying on argument-dependent
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// lookup to find the appropriate postconstructor or predestructor.
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// Passing arguments to postconstructors is also supported.
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//
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// based on make_shared.hpp and make_shared_access patch from Michael Marcin
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//
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// Copyright (c) 2007, 2008 Peter Dimov
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// Copyright (c) 2008 Michael Marcin
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// Copyright (c) 2009 Frank Mori Hess
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//
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// Distributed under the Boost Software License, Version 1.0.
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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//
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// See http://www.boost.org
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// for more information
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#include <boost/config.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/type_traits/alignment_of.hpp>
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#include <boost/type_traits/remove_const.hpp>
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#include <boost/type_traits/type_with_alignment.hpp>
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#include <cstddef>
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#include <new>
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namespace boost
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{
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template<typename T> class enable_shared_from_this;
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namespace signals2
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{
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class deconstruct_access;
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namespace detail
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{
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inline void adl_predestruct(...) {}
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} // namespace detail
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template<typename T>
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class postconstructor_invoker
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{
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public:
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operator const shared_ptr<T> & () const
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{
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return postconstruct();
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}
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const shared_ptr<T>& postconstruct() const
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{
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if(!_postconstructed)
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{
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adl_postconstruct(_sp, const_cast<typename boost::remove_const<T>::type *>(_sp.get()));
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_postconstructed = true;
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}
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return _sp;
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}
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#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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template<class... Args>
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const shared_ptr<T>& postconstruct(Args && ... args)
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{
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if(!_postconstructed)
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{
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adl_postconstruct(_sp, const_cast<typename boost::remove_const<T>::type *>(_sp.get()),
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std::forward<Args>(args)...);
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_postconstructed = true;
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}
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return _sp;
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}
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#else // !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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template<typename A1>
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const shared_ptr<T>& postconstruct(const A1 &a1) const
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{
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if(!_postconstructed)
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{
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adl_postconstruct(_sp, const_cast<typename boost::remove_const<T>::type *>(_sp.get()),
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a1);
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_postconstructed = true;
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}
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return _sp;
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}
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template<typename A1, typename A2>
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const shared_ptr<T>& postconstruct(const A1 &a1, const A2 &a2) const
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{
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if(!_postconstructed)
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{
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adl_postconstruct(_sp, const_cast<typename boost::remove_const<T>::type *>(_sp.get()),
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a1, a2);
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_postconstructed = true;
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}
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return _sp;
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}
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template<typename A1, typename A2, typename A3>
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const shared_ptr<T>& postconstruct(const A1 &a1, const A2 &a2, const A3 &a3) const
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{
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if(!_postconstructed)
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{
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adl_postconstruct(_sp, const_cast<typename boost::remove_const<T>::type *>(_sp.get()),
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a1, a2, a3);
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_postconstructed = true;
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}
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return _sp;
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}
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template<typename A1, typename A2, typename A3, typename A4>
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const shared_ptr<T>& postconstruct(const A1 &a1, const A2 &a2, const A3 &a3, const A4 &a4) const
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{
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if(!_postconstructed)
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{
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adl_postconstruct(_sp, const_cast<typename boost::remove_const<T>::type *>(_sp.get()),
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a1, a2, a3, a4);
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_postconstructed = true;
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}
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return _sp;
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}
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template<typename A1, typename A2, typename A3, typename A4, typename A5>
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const shared_ptr<T>& postconstruct(const A1 &a1, const A2 &a2, const A3 &a3, const A4 &a4, const A5 &a5) const
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{
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if(!_postconstructed)
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{
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adl_postconstruct(_sp, const_cast<typename boost::remove_const<T>::type *>(_sp.get()),
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a1, a2, a3, a4, a5);
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_postconstructed = true;
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}
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return _sp;
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}
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template<typename A1, typename A2, typename A3, typename A4, typename A5,
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typename A6>
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const shared_ptr<T>& postconstruct(const A1 &a1, const A2 &a2, const A3 &a3, const A4 &a4, const A5 &a5,
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const A6 &a6) const
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{
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if(!_postconstructed)
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{
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adl_postconstruct(_sp, const_cast<typename boost::remove_const<T>::type *>(_sp.get()),
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a1, a2, a3, a4, a5, a6);
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_postconstructed = true;
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}
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return _sp;
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}
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template<typename A1, typename A2, typename A3, typename A4, typename A5,
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typename A6, typename A7>
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const shared_ptr<T>& postconstruct(const A1 &a1, const A2 &a2, const A3 &a3, const A4 &a4, const A5 &a5,
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const A6 &a6, const A7 &a7) const
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{
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if(!_postconstructed)
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{
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adl_postconstruct(_sp, const_cast<typename boost::remove_const<T>::type *>(_sp.get()),
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a1, a2, a3, a4, a5, a6, a7);
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_postconstructed = true;
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}
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return _sp;
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}
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template<typename A1, typename A2, typename A3, typename A4, typename A5,
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typename A6, typename A7, typename A8>
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const shared_ptr<T>& postconstruct(const A1 &a1, const A2 &a2, const A3 &a3, const A4 &a4, const A5 &a5,
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const A6 &a6, const A7 &a7, const A8 &a8) const
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{
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if(!_postconstructed)
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{
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adl_postconstruct(_sp, const_cast<typename boost::remove_const<T>::type *>(_sp.get()),
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a1, a2, a3, a4, a5, a6, a7, a8);
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_postconstructed = true;
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}
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return _sp;
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}
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template<typename A1, typename A2, typename A3, typename A4, typename A5,
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typename A6, typename A7, typename A8, typename A9>
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const shared_ptr<T>& postconstruct(const A1 &a1, const A2 &a2, const A3 &a3, const A4 &a4, const A5 &a5,
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const A6 &a6, const A7 &a7, const A8 &a8, const A9 &a9) const
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{
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if(!_postconstructed)
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{
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adl_postconstruct(_sp, const_cast<typename boost::remove_const<T>::type *>(_sp.get()),
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a1, a2, a3, a4, a5, a6, a7, a8, a9);
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_postconstructed = true;
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}
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return _sp;
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}
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#endif // !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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private:
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friend class boost::signals2::deconstruct_access;
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postconstructor_invoker(const shared_ptr<T> & sp):
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_sp(sp), _postconstructed(false)
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{}
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shared_ptr<T> _sp;
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mutable bool _postconstructed;
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};
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namespace detail
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{
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template< std::size_t N, std::size_t A > struct sp_aligned_storage
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{
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union type
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{
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char data_[ N ];
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typename boost::type_with_alignment< A >::type align_;
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};
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};
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template< class T > class deconstruct_deleter
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{
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private:
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typedef typename sp_aligned_storage< sizeof( T ), ::boost::alignment_of< T >::value >::type storage_type;
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bool initialized_;
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storage_type storage_;
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private:
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void destroy()
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{
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if( initialized_ )
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{
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T* p = reinterpret_cast< T* >( storage_.data_ );
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using boost::signals2::detail::adl_predestruct;
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adl_predestruct(const_cast<typename boost::remove_const<T>::type *>(p));
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p->~T();
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initialized_ = false;
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}
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}
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public:
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deconstruct_deleter(): initialized_( false )
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{
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}
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// this copy constructor is an optimization: we don't need to copy the storage_ member,
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// and shouldn't be copying anyways after initialized_ becomes true
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deconstruct_deleter(const deconstruct_deleter &): initialized_( false )
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{
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}
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~deconstruct_deleter()
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{
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destroy();
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}
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void operator()( T * )
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{
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destroy();
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}
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void * address()
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{
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return storage_.data_;
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}
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void set_initialized()
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{
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initialized_ = true;
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}
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};
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} // namespace detail
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class deconstruct_access
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{
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public:
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template< class T >
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static postconstructor_invoker<T> deconstruct()
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{
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boost::shared_ptr< T > pt( static_cast< T* >( 0 ), detail::deconstruct_deleter< T >() );
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detail::deconstruct_deleter< T > * pd = boost::get_deleter< detail::deconstruct_deleter< T > >( pt );
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void * pv = pd->address();
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new( pv ) T();
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pd->set_initialized();
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boost::shared_ptr< T > retval( pt, static_cast< T* >( pv ) );
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boost::detail::sp_enable_shared_from_this(&retval, retval.get(), retval.get());
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return retval;
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}
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#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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// Variadic templates, rvalue reference
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template< class T, class... Args >
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static postconstructor_invoker<T> deconstruct( Args && ... args )
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{
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boost::shared_ptr< T > pt( static_cast< T* >( 0 ), detail::deconstruct_deleter< T >() );
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detail::deconstruct_deleter< T > * pd = boost::get_deleter< detail::deconstruct_deleter< T > >( pt );
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void * pv = pd->address();
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new( pv ) T( std::forward<Args>( args )... );
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pd->set_initialized();
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boost::shared_ptr< T > retval( pt, static_cast< T* >( pv ) );
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boost::detail::sp_enable_shared_from_this(&retval, retval.get(), retval.get());
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return retval;
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}
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#else
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template< class T, class A1 >
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static postconstructor_invoker<T> deconstruct( A1 const & a1 )
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{
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boost::shared_ptr< T > pt( static_cast< T* >( 0 ), detail::deconstruct_deleter< T >() );
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detail::deconstruct_deleter< T > * pd = boost::get_deleter< detail::deconstruct_deleter< T > >( pt );
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void * pv = pd->address();
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new( pv ) T( a1 );
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pd->set_initialized();
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boost::shared_ptr< T > retval( pt, static_cast< T* >( pv ) );
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boost::detail::sp_enable_shared_from_this(&retval, retval.get(), retval.get());
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return retval;
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}
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template< class T, class A1, class A2 >
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static postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2 )
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{
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boost::shared_ptr< T > pt( static_cast< T* >( 0 ), detail::deconstruct_deleter< T >() );
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detail::deconstruct_deleter< T > * pd = boost::get_deleter< detail::deconstruct_deleter< T > >( pt );
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void * pv = pd->address();
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new( pv ) T( a1, a2 );
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pd->set_initialized();
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boost::shared_ptr< T > retval( pt, static_cast< T* >( pv ) );
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boost::detail::sp_enable_shared_from_this(&retval, retval.get(), retval.get());
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return retval;
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}
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template< class T, class A1, class A2, class A3 >
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static postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3 )
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{
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boost::shared_ptr< T > pt( static_cast< T* >( 0 ), detail::deconstruct_deleter< T >() );
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detail::deconstruct_deleter< T > * pd = boost::get_deleter< detail::deconstruct_deleter< T > >( pt );
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void * pv = pd->address();
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new( pv ) T( a1, a2, a3 );
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pd->set_initialized();
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boost::shared_ptr< T > retval( pt, static_cast< T* >( pv ) );
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boost::detail::sp_enable_shared_from_this(&retval, retval.get(), retval.get());
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return retval;
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}
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template< class T, class A1, class A2, class A3, class A4 >
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static postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4 )
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{
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boost::shared_ptr< T > pt( static_cast< T* >( 0 ), detail::deconstruct_deleter< T >() );
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detail::deconstruct_deleter< T > * pd = boost::get_deleter< detail::deconstruct_deleter< T > >( pt );
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void * pv = pd->address();
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new( pv ) T( a1, a2, a3, a4 );
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pd->set_initialized();
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boost::shared_ptr< T > retval( pt, static_cast< T* >( pv ) );
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boost::detail::sp_enable_shared_from_this(&retval, retval.get(), retval.get());
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return retval;
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}
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template< class T, class A1, class A2, class A3, class A4, class A5 >
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static postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4, A5 const & a5 )
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{
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boost::shared_ptr< T > pt( static_cast< T* >( 0 ), detail::deconstruct_deleter< T >() );
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detail::deconstruct_deleter< T > * pd = boost::get_deleter< detail::deconstruct_deleter< T > >( pt );
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void * pv = pd->address();
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new( pv ) T( a1, a2, a3, a4, a5 );
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pd->set_initialized();
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boost::shared_ptr< T > retval( pt, static_cast< T* >( pv ) );
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boost::detail::sp_enable_shared_from_this(&retval, retval.get(), retval.get());
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return retval;
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}
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template< class T, class A1, class A2, class A3, class A4, class A5, class A6 >
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static postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4, A5 const & a5, A6 const & a6 )
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{
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boost::shared_ptr< T > pt( static_cast< T* >( 0 ), detail::deconstruct_deleter< T >() );
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detail::deconstruct_deleter< T > * pd = boost::get_deleter< detail::deconstruct_deleter< T > >( pt );
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void * pv = pd->address();
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new( pv ) T( a1, a2, a3, a4, a5, a6 );
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pd->set_initialized();
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boost::shared_ptr< T > retval( pt, static_cast< T* >( pv ) );
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boost::detail::sp_enable_shared_from_this(&retval, retval.get(), retval.get());
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return retval;
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}
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template< class T, class A1, class A2, class A3, class A4, class A5, class A6, class A7 >
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static postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4, A5 const & a5, A6 const & a6, A7 const & a7 )
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{
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boost::shared_ptr< T > pt( static_cast< T* >( 0 ), detail::deconstruct_deleter< T >() );
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detail::deconstruct_deleter< T > * pd = boost::get_deleter< detail::deconstruct_deleter< T > >( pt );
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void * pv = pd->address();
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new( pv ) T( a1, a2, a3, a4, a5, a6, a7 );
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pd->set_initialized();
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boost::shared_ptr< T > retval( pt, static_cast< T* >( pv ) );
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boost::detail::sp_enable_shared_from_this(&retval, retval.get(), retval.get());
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return retval;
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}
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template< class T, class A1, class A2, class A3, class A4, class A5, class A6, class A7, class A8 >
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static postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4, A5 const & a5, A6 const & a6, A7 const & a7, A8 const & a8 )
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{
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boost::shared_ptr< T > pt( static_cast< T* >( 0 ), detail::deconstruct_deleter< T >() );
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detail::deconstruct_deleter< T > * pd = boost::get_deleter< detail::deconstruct_deleter< T > >( pt );
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void * pv = pd->address();
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new( pv ) T( a1, a2, a3, a4, a5, a6, a7, a8 );
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pd->set_initialized();
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boost::shared_ptr< T > retval( pt, static_cast< T* >( pv ) );
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boost::detail::sp_enable_shared_from_this(&retval, retval.get(), retval.get());
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return retval;
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}
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template< class T, class A1, class A2, class A3, class A4, class A5, class A6, class A7, class A8, class A9 >
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static postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4, A5 const & a5, A6 const & a6, A7 const & a7, A8 const & a8, A9 const & a9 )
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{
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boost::shared_ptr< T > pt( static_cast< T* >( 0 ), detail::deconstruct_deleter< T >() );
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detail::deconstruct_deleter< T > * pd = boost::get_deleter< detail::deconstruct_deleter< T > >( pt );
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void * pv = pd->address();
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new( pv ) T( a1, a2, a3, a4, a5, a6, a7, a8, a9 );
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pd->set_initialized();
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|
|
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boost::shared_ptr< T > retval( pt, static_cast< T* >( pv ) );
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|
boost::detail::sp_enable_shared_from_this(&retval, retval.get(), retval.get());
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return retval;
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|
}
|
|
|
|
#endif
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|
};
|
|
|
|
// Zero-argument versions
|
|
//
|
|
// Used even when variadic templates are available because of the new T() vs new T issue
|
|
|
|
template< class T > postconstructor_invoker<T> deconstruct()
|
|
{
|
|
return deconstruct_access::deconstruct<T>();
|
|
}
|
|
|
|
#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
|
|
|
|
// Variadic templates, rvalue reference
|
|
|
|
template< class T, class... Args > postconstructor_invoker< T > deconstruct( Args && ... args )
|
|
{
|
|
return deconstruct_access::deconstruct<T>( std::forward<Args>( args )... );
|
|
}
|
|
|
|
#else
|
|
|
|
// C++03 version
|
|
|
|
template< class T, class A1 >
|
|
postconstructor_invoker<T> deconstruct( A1 const & a1 )
|
|
{
|
|
return deconstruct_access::deconstruct<T>(a1);
|
|
}
|
|
|
|
template< class T, class A1, class A2 >
|
|
postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2 )
|
|
{
|
|
return deconstruct_access::deconstruct<T>(a1,a2);
|
|
}
|
|
|
|
template< class T, class A1, class A2, class A3 >
|
|
postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3 )
|
|
{
|
|
return deconstruct_access::deconstruct<T>(a1,a2,a3);
|
|
}
|
|
|
|
template< class T, class A1, class A2, class A3, class A4 >
|
|
postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4 )
|
|
{
|
|
return deconstruct_access::deconstruct<T>(a1,a2,a3,a4);
|
|
}
|
|
|
|
template< class T, class A1, class A2, class A3, class A4, class A5 >
|
|
postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4, A5 const & a5 )
|
|
{
|
|
return deconstruct_access::deconstruct<T>(a1,a2,a3,a4,a5);
|
|
}
|
|
|
|
template< class T, class A1, class A2, class A3, class A4, class A5, class A6 >
|
|
postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4, A5 const & a5, A6 const & a6 )
|
|
{
|
|
return deconstruct_access::deconstruct<T>(a1,a2,a3,a4,a5,a6);
|
|
}
|
|
|
|
template< class T, class A1, class A2, class A3, class A4, class A5, class A6, class A7 >
|
|
postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4, A5 const & a5, A6 const & a6, A7 const & a7 )
|
|
{
|
|
return deconstruct_access::deconstruct<T>(a1,a2,a3,a4,a5,a6,a7);
|
|
}
|
|
|
|
template< class T, class A1, class A2, class A3, class A4, class A5, class A6, class A7, class A8 >
|
|
postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4, A5 const & a5, A6 const & a6, A7 const & a7, A8 const & a8 )
|
|
{
|
|
return deconstruct_access::deconstruct<T>(a1,a2,a3,a4,a5,a6,a7,a8);
|
|
}
|
|
|
|
template< class T, class A1, class A2, class A3, class A4, class A5, class A6, class A7, class A8, class A9 >
|
|
postconstructor_invoker<T> deconstruct( A1 const & a1, A2 const & a2, A3 const & a3, A4 const & a4, A5 const & a5, A6 const & a6, A7 const & a7, A8 const & a8, A9 const & a9 )
|
|
{
|
|
return deconstruct_access::deconstruct<T>(a1,a2,a3,a4,a5,a6,a7,a8,a9);
|
|
}
|
|
|
|
#endif
|
|
|
|
} // namespace signals2
|
|
} // namespace boost
|
|
|
|
#endif // #ifndef BOOST_SIGNALS2_DECONSTRUCT_HPP
|