cppannotations/annotations/yo/stl/uniquemove.yo

    A tt(unique_ptr) hi(unique_ptr: move constructor) may be initialized
using an rvalue reference to a tt(unique_ptr) object for the same type:
        verb(
    unique_ptr<type> identifier(other unique_ptr object);
        )
    The move constructor is used, e.g., in the following example:
        verb(
    void mover(unique_ptr<string> &&param)
    {
        unique_ptr<string> tmp(move(param));
    }
        )
    Analogously, the assignment operator can hi(unique_ptr: assignment) be
used. A tt(unique_ptr) object may be assigned to a temporary  tt(unique_ptr)
object of the same type (again move-semantics is used). For example:
        verbinclude(-a examples/uniqueother.cc)
    The example illustrates that
    itemization(
    it() tt(hello1) is initialized by a pointer to a dynamically alloctated
tt(string) (see the next section).
    it() The tt(unique_ptr hello2) grabs the pointer controlled by tt(hello1)
using a move constructor. This effectively changes tt(hello1) into a
0-pointer.
    it() Then tt(hello3) is defined as a default tt(unique_ptr<string>). But
then it grabs its value using move-assignment from tt(hello2) (which, as a
consequence, is changed into a 0-pointer as well)
    )
    If tt(hello1) or tt(hello2) had been inserted into tt(cout) a
emi(segmentation fault) would have resulted. The reason for this should now be
clear: it is caused by dereferencing 0-pointers. In the end, only tt(hello3)
actually points to the originally allocated tt(string).