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François pointed out that static_cast<__node_ptr>(&_M_before_begin) is invalid, because _M_before_begin is only a node-base not a node. Refactor the new merge overloads to only cast when we know we have a valid node. He also pointed out some optimizations to allow reusing hash codes that might be cached in the node. The _M_src_hash_code function already has the right logic to decide when a cached hash code can be reused by a different _Hashtable object. libstdc++-v3/ChangeLog: * include/bits/hashtable.h (_Hashtable::_M_src_hash_code): Improve comments. (_Hashtable::_M_merge_unique(_Hashtable&)): Use pointer_traits to get before-begin pointer. Only use static_cast on valid nodes, not the before-begin pointer. Reuse a hash code cached in the node when possible. (_Hashtable::_M_merge_multi(_Hashtable&)): Likewise. Reviewed-by: François Dumont <fdumont@gcc.gnu.org> |
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