Subject: [boost] [STL + allocators] Bug?
From: Phil Bouchard (philippeb8_at_[hidden])
Date: 2016-02-17 13:17:47
This is about STL containers and allocators. It looks like a mistake in
the STL containers but I don't think there is any possible workarounds
if the Boost library is based on it.
When I look at the code of GCC's std::list:
template<typename _Tp, typename _Alloc>
void
_List_base<_Tp, _Alloc>::
_M_clear()
{
typedef _List_node<_Tp> _Node;
_Node* __cur = static_cast<_Node*>(_M_impl._M_node._M_next);
while (__cur != &_M_impl._M_node)
{
_Node* __tmp = __cur;
__cur = static_cast<_Node*>(__cur->_M_next);
#if __cplusplus >= 201103L
_M_get_Node_allocator().destroy(__tmp);
#else
_M_get_Tp_allocator().destroy(std::__addressof(__tmp->_M_data));
#endif
_M_put_node(__tmp);
}
}
I think it should make use of the allocator's specific pointer as such:
template<typename _Tp, typename _Alloc>
void
_List_base<_Tp, _Alloc>::
_M_clear()
{
typedef _List_node<_Tp> _Node;
typedef typename _Alloc::rebind<_Node>::other::pointer _NodePtr;
_NodePtr __cur = static_cast<_NodePtr>(_M_impl._M_node._M_next);
while (__cur != &_M_impl._M_node)
{
_NodePtr __tmp = __cur;
__cur = static_cast<_NodePtr>(__cur->_M_next);
#if __cplusplus >= 201103L
_M_get_Node_allocator().destroy(__tmp);
#else
_M_get_Tp_allocator().destroy(std::__addressof(__tmp->_M_data));
#endif
_M_put_node(__tmp);
}
}
Meanwhile I don't think there is any workaround possible for this for
use of an allocator with specific pointer in Boost?