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Add rvalue versions of static_pointer_cast, const_pointer_cast, dynamic_pointer_cast, reinterpret_pointer_cast.

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Aligns with proposed addition to std:: here: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0390r0.htm
This commit is contained in:
Chris Glover
2016-12-11 15:38:34 -05:00
parent 61075bb9df
commit 3e2ac10e94
3 changed files with 141 additions and 0 deletions
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include/boost/smart_ptr/shared_ptr.hpp
+44
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@@ -883,6 +883,50 @@ template<class T, class U> shared_ptr<T> reinterpret_pointer_cast( shared_ptr<U>
return shared_ptr<T>( r, p );
}
#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
template<class T, class U> shared_ptr<T> static_pointer_cast( shared_ptr<U> && r ) BOOST_NOEXCEPT
{
(void) static_cast< T* >( static_cast< U* >( 0 ) );
typedef typename shared_ptr<T>::element_type E;
E * p = static_cast< E* >( r.get() );
return shared_ptr<T>( std::move(r), p );
}
template<class T, class U> shared_ptr<T> const_pointer_cast( shared_ptr<U> && r ) BOOST_NOEXCEPT
{
(void) const_cast< T* >( static_cast< U* >( 0 ) );
typedef typename shared_ptr<T>::element_type E;
E * p = const_cast< E* >( r.get() );
return shared_ptr<T>( std::move(r), p );
}
template<class T, class U> shared_ptr<T> dynamic_pointer_cast( shared_ptr<U> && r ) BOOST_NOEXCEPT
{
(void) dynamic_cast< T* >( static_cast< U* >( 0 ) );
typedef typename shared_ptr<T>::element_type E;
E * p = dynamic_cast< E* >( r.get() );
return p? shared_ptr<T>( std::move(r), p ): shared_ptr<T>();
}
template<class T, class U> shared_ptr<T> reinterpret_pointer_cast( shared_ptr<U> && r ) BOOST_NOEXCEPT
{
(void) reinterpret_cast< T* >( static_cast< U* >( 0 ) );
typedef typename shared_ptr<T>::element_type E;
E * p = reinterpret_cast< E* >( r.get() );
return shared_ptr<T>( std::move(r), p );
}
#endif // !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
// get_pointer() enables boost::mem_fn to recognize shared_ptr
template<class T> inline typename shared_ptr<T>::element_type * get_pointer(shared_ptr<T> const & p) BOOST_NOEXCEPT