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