问问题
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2
InterfaceImpl()
returns a temporary object (rvalue) that you cannot keep in a non-const reference.
However when you instantiate IInterface i
i becomes an lvalue, So you can keep it in non-const reference.
However binding non-const reference to rvalue is allowed in VS . It has been discussed in this thread
于 2013-05-18T16:05:12.047 回答