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enum Reaction{single,chain};
class X
{
X* parent_;
X* left_;
X* right_;
Reaction* reaction_;//this pointer points from every obj to the same place, cannot be static
};
The Q is: how to design destructor in order to delete reaction_ only once?
Three immediate ideas:
1) Must reaction_ be owned by an instance of class X? Can’t it be owned by an external entity, so that no X::~X will ever need to delete it?
2) Use boost::shared_ptr
3) Implement your own reference counting using a static int. Remember locking if you’re multithreaded.