namespace boost
{

    template
    < 
        class Key, 
        class Compare = std::less<Key>, 
        class CloneAllocator = heap_clone_allocator, 
        class Allocator = std::allocator<void*>
    >
    class ptr_set : public ptr_set_adapter
                            <
                                Key,
                                std::set<void*,
                                void_ptr_indirect_fun<Compare,Key>,Allocator>,
                                CloneAllocator
                            >
    {
        // see references

    }; // class 'ptr_set'

} // namespace 'boost'