Hi all,

If I do the following
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shared_ptr<int> pA( new int(1) );
shared_ptr<int> pB( new int(2) );
shared_ptr<int> pNew( new int(3) );

// thread A
pA = pB;

// thread B
pB = pNew;
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I know that whether pA will be int(2) or int(3) after execution is
undefined, but if I do want to do this no matter what value of
pA I get, will this cause atomicity problem? I mean, thread A
increases counter for int(2), but thread B decrease it, is this
thread safe?