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Message: [QUOTE="Denis Remezov, post: 1500231"] [i] I don't think that this is the case here. The compiler warns of the expression ((trie_node*)NULL)->children (twice) However, since both this and the expression *<the_above> are operands of sizeof, they are never evaluated. In particular, there is no dereferencing or access to data as the compiler thinks. Everything is well defined here. I've noticed an interesting detail: if you convert trie_node to a POD (just make all members public), the warnings will go away. I thought this might have something to do with the compiler attempting to control the usage of the offsetof macro, which is only defined for PODs. Denis[/i] [/QUOTE]