问题描述
I'm writing an accessor method for a shared pointer in C++ that goes something like this:
So to support the const-ness of getBar()
the return type should be a boost::shared_ptr
that prevents modification of the Bar
it points to. My guess is that shared_ptr<const Bar>
is the type I want to return to do that, whereas const shared_ptr<Bar>
would prevent reassignment of the pointer itself to point to a different Bar
but allow modification of the Bar
that it points to... However, I'm not sure. I'd appreciate it if someone who knows for sure could either confirm this, or correct me if I got it wrong. Thanks!
You are right. shared_ptr<const T> p;
is similar to const T * p;
(or, equivalently, T const * p;
), that is, the pointed object is const
whereas const shared_ptr<T> p;
is similar to T* const p;
which means that p
is const
. In summary:
The same holds for weak_ptr
and unique_ptr
.
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