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Rvalue auto_ptr support, technique by Dave Abrahams

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[SVN r32326]
This commit is contained in:
Peter Dimov
2006-01-15 13:54:53 +00:00
parent a196f39cd0
commit a86b2f7fbf
1 changed files with 44 additions and 4 deletions
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48
include/boost/shared_ptr.hpp
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@ -5,7 +5,7 @@
// shared_ptr.hpp
//
// (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
// Copyright (c) 2001, 2002, 2003 Peter Dimov
// Copyright (c) 2001-2006 Peter Dimov
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
@ -101,6 +101,21 @@ inline void sp_enable_shared_from_this( shared_count const & /*pn*/, ... )
# pragma reset woff 3506
#endif
#if !defined( BOOST_NO_SFINAE ) && !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION ) && !defined( BOOST_NO_AUTO_PTR )
// rvalue auto_ptr support based on a technique by Dave Abrahams
template< class T, class R > struct sp_enable_if_auto_ptr
{
};
template< class T, class R > struct sp_enable_if_auto_ptr< std::auto_ptr< T >, R >
{
typedef R type;
};
#endif
} // namespace detail
@ -218,7 +233,20 @@ public:
boost::detail::sp_enable_shared_from_this( pn, tmp, tmp );
}
#endif
#if !defined( BOOST_NO_SFINAE ) && !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
template<class Ap>
explicit shared_ptr( Ap r, typename detail::sp_enable_if_auto_ptr<Ap, int>::type = 0 ): px( r.get() ), pn()
{
typename Ap::element_type * tmp = r.get();
pn = boost::detail::shared_count( r );
boost::detail::sp_enable_shared_from_this( pn, tmp, tmp );
}
#endif // BOOST_NO_SFINAE, BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
#endif // BOOST_NO_AUTO_PTR
#if !defined(BOOST_MSVC) || (BOOST_MSVC >= 1300)
@ -235,13 +263,25 @@ public:
#ifndef BOOST_NO_AUTO_PTR
template<class Y>
shared_ptr & operator=(std::auto_ptr<Y> & r)
shared_ptr & operator=( std::auto_ptr<Y> & r )
{
this_type(r).swap(*this);
return *this;
}
#endif
#if !defined( BOOST_NO_SFINAE ) && !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
template<class Ap>
typename detail::sp_enable_if_auto_ptr< Ap, shared_ptr & >::type operator=( Ap r )
{
this_type( r ).swap( *this );
return *this;
}
#endif // BOOST_NO_SFINAE, BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
#endif // BOOST_NO_AUTO_PTR
void reset() // never throws in 1.30+
{