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tt(Unique_ptr)'s default constructor defines a hi(unique_ptr: default)
tt(unique_ptr) not pointing to a particular block of memory:
verb( unique_ptr<type> identifier;)
The hi(unique_ptr: 0-pointer) pointer controlled by the tt(unique_ptr)
object is initialized to tt(0) (zero). Although the tt(unique_ptr) object
itself is not the pointer, its value em(can) be compared to tt(0). Example:
verb( unique_ptr<int> ip;
if (!ip)
cout << "0-pointer with a unique_ptr object\n";)
Alternatively, the member ti(get) can be used (cf. section ref(UNIQUEMEM)).
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