On Sunday, 3 November 2013 at 16:01:44 UTC, jerro wrote:
Now we can't have an A as a member of X? (it would free a null pointer)

Actually, there is nothing wrong with calling free on a null pointer.
From the C 89 standard:

The free function causes the space pointed to by ptr to be deallocated, that is, made available for further allocation. If ptr is a null pointer, no action occurs.

Oops, right, not the best example. But you get the motivating idea :-)

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