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#ifndef BOOST_SMART_PTR_MAKE_LOCAL_SHARED_OBJECT_HPP_INCLUDED
#define BOOST_SMART_PTR_MAKE_LOCAL_SHARED_OBJECT_HPP_INCLUDED
// make_local_shared_object.hpp
//
// Copyright 2017 Peter Dimov
//
// 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/libs/smart_ptr/ for documentation.
#include <boost/smart_ptr/local_shared_ptr.hpp>
#include <boost/smart_ptr/make_shared.hpp>
#include <boost/config.hpp>
#include <utility>
#include <cstddef>
namespace boost
{
namespace detail
{
// lsp_if_not_array
template<class T> struct lsp_if_not_array
{
typedef boost::local_shared_ptr<T> type;
};
template<class T> struct lsp_if_not_array<T[]>
{
};
template<class T, std::size_t N> struct lsp_if_not_array<T[N]>
{
};
// lsp_ms_deleter
template<class T, class A> class lsp_ms_deleter: public local_counted_impl_em
{
private:
typedef typename sp_aligned_storage<sizeof(T), ::boost::alignment_of<T>::value>::type storage_type;
storage_type storage_;
A a_;
bool initialized_;
private:
void destroy() BOOST_SP_NOEXCEPT
{
if( initialized_ )
{
T * p = reinterpret_cast< T* >( storage_.data_ );
#if !defined( BOOST_NO_CXX11_ALLOCATOR )
std::allocator_traits<A>::destroy( a_, p );
#else
p->~T();
#endif
initialized_ = false;
}
}
public:
explicit lsp_ms_deleter( A const & a ) BOOST_SP_NOEXCEPT : a_( a ), initialized_( false )
{
}
// optimization: do not copy storage_
lsp_ms_deleter( lsp_ms_deleter const & r ) BOOST_SP_NOEXCEPT : a_( r.a_), initialized_( false )
{
}
~lsp_ms_deleter() BOOST_SP_NOEXCEPT
{
destroy();
}
void operator()( T * ) BOOST_SP_NOEXCEPT
{
destroy();
}
static void operator_fn( T* ) BOOST_SP_NOEXCEPT // operator() can't be static
{
}
void * address() BOOST_SP_NOEXCEPT
{
return storage_.data_;
}
void set_initialized() BOOST_SP_NOEXCEPT
{
initialized_ = true;
}
};
} // namespace detail
template<class T, class A, class... Args> typename boost::detail::lsp_if_not_array<T>::type allocate_local_shared( A const & a, Args&&... args )
{
#if !defined( BOOST_NO_CXX11_ALLOCATOR )
typedef typename std::allocator_traits<A>::template rebind_alloc<T> A2;
#else
typedef typename A::template rebind<T>::other A2;
#endif
A2 a2( a );
typedef boost::detail::lsp_ms_deleter<T, A2> D;
boost::shared_ptr<T> pt( static_cast< T* >( 0 ), boost::detail::sp_inplace_tag<D>(), a2 );
D * pd = static_cast< D* >( pt._internal_get_untyped_deleter() );
void * pv = pd->address();
#if !defined( BOOST_NO_CXX11_ALLOCATOR )
std::allocator_traits<A2>::construct( a2, static_cast< T* >( pv ), std::forward<Args>( args )... );
#else
::new( pv ) T( std::forward<Args>( args )... );
#endif
pd->set_initialized();
T * pt2 = static_cast< T* >( pv );
boost::detail::sp_enable_shared_from_this( &pt, pt2, pt2 );
pd->pn_ = pt._internal_count();
return boost::local_shared_ptr<T>( boost::detail::lsp_internal_constructor_tag(), pt2, pd );
}
template<class T, class A> typename boost::detail::lsp_if_not_array<T>::type allocate_local_shared_noinit( A const & a )
{
#if !defined( BOOST_NO_CXX11_ALLOCATOR )
typedef typename std::allocator_traits<A>::template rebind_alloc<T> A2;
#else
typedef typename A::template rebind<T>::other A2;
#endif
A2 a2( a );
typedef boost::detail::lsp_ms_deleter< T, std::allocator<T> > D;
boost::shared_ptr<T> pt( static_cast< T* >( 0 ), boost::detail::sp_inplace_tag<D>(), a2 );
D * pd = static_cast< D* >( pt._internal_get_untyped_deleter() );
void * pv = pd->address();
::new( pv ) T;
pd->set_initialized();
T * pt2 = static_cast< T* >( pv );
boost::detail::sp_enable_shared_from_this( &pt, pt2, pt2 );
pd->pn_ = pt._internal_count();
return boost::local_shared_ptr<T>( boost::detail::lsp_internal_constructor_tag(), pt2, pd );
}
template<class T, class... Args> typename boost::detail::lsp_if_not_array<T>::type make_local_shared( Args&&... args )
{
return boost::allocate_local_shared<T>( std::allocator<T>(), std::forward<Args>(args)... );
}
template<class T> typename boost::detail::lsp_if_not_array<T>::type make_local_shared_noinit()
{
return boost::allocate_shared_noinit<T>( std::allocator<T>() );
}
} // namespace boost
#endif // #ifndef BOOST_SMART_PTR_MAKE_SHARED_OBJECT_HPP_INCLUDED
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