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Fix undefined behaviour with default casting implementations. Null pointers can't be dereferenced, so return a value constructed smart pointer in those cases.

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This commit is contained in:
Ion Gaztañaga
2015-10-18 21:30:10 +02:00
parent ea47994cc0
commit 7de667ed5e
1 changed files with 3 additions and 11 deletions
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14
include/boost/intrusive/pointer_traits.hpp
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@@ -223,7 +223,7 @@ struct pointer_traits
template<class UPtr>
static pointer priv_static_cast_from(boost::intrusive::detail::false_, const UPtr &uptr)
{ return pointer_to(*static_cast<element_type*>(to_raw_pointer(uptr))); }
{ return uptr ? pointer_to(*static_cast<element_type*>(to_raw_pointer(uptr))) : pointer(); }
//priv_const_cast_from
template<class UPtr>
@@ -232,7 +232,7 @@ struct pointer_traits
template<class UPtr>
static pointer priv_const_cast_from(boost::intrusive::detail::false_, const UPtr &uptr)
{ return pointer_to(const_cast<element_type&>(*uptr)); }
{ return uptr ? pointer_to(const_cast<element_type&>(*uptr)) : pointer(); }
//priv_dynamic_cast_from
template<class UPtr>
@@ -241,15 +241,7 @@ struct pointer_traits
template<class UPtr>
static pointer priv_dynamic_cast_from(boost::intrusive::detail::false_, const UPtr &uptr)
{
element_type *p = dynamic_cast<element_type*>(&*uptr);
if(!p){
return pointer();
}
else{
return pointer_to(*p);
}
}
{ return uptr ? pointer_to(dynamic_cast<element_type&>(*uptr)) : pointer(); }
///@endcond
};