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lib: new utility structs

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default_holder: default header node holder
get_header_holder_type: type function producing header_holder_type
This commit is contained in:
Matei David
2014-05-15 16:08:25 -04:00
parent 3af2654eda
commit 32878fb9f7
1 changed files with 30 additions and 0 deletions
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30
include/boost/intrusive/detail/utilities.hpp
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@@ -894,6 +894,36 @@ static typename uncast_types<ConstNodePtr>::non_const_pointer
return uncast_types<ConstNodePtr>::non_const_traits::const_cast_from(ptr);
}
// trivial header node holder
template < typename Node_Traits >
struct default_holder : public Node_Traits::node
{
typedef Node_Traits node_traits;
typedef typename node_traits::node node;
typedef typename node_traits::node_ptr node_ptr;
typedef typename node_traits::const_node_ptr const_node_ptr;
default_holder() : node() {}
const_node_ptr get_header_node() const
{ return pointer_traits< const_node_ptr >::pointer_to(*static_cast< const node* >(this)); }
node_ptr get_header_node()
{ return pointer_traits< node_ptr >::pointer_to(*static_cast< node* >(this)); }
};
// type function producing the header node holder
template < typename Value_Traits, typename Header_Holder >
struct get_header_holder_type
{
typedef Header_Holder type;
};
template < typename Value_Traits >
struct get_header_holder_type< Value_Traits, void >
{
typedef default_holder< typename Value_Traits::node_traits > type;
};
} //namespace detail
template<class Node, class Tag, unsigned int>