I have a suggestion for two new member functions for shared_ptr<X> .
Both give useful information that is currently available, but in non-obvious
or potentially inefficient ways.
1) bool empty() const
returns true if the shared_ptr does not own an object, and false if
it does own an object. It is currently possible to determine this
information for a shared_ptr x by typing
if (x.shared_count() == 0)
but this may be inefficient.
2) template<class Y>
bool shares_ownership_with(shared_ptr<Y> rhs) const
returns true if and only if *this and rhs own the same object.
It is currently possible to determine if two shared_ptr's x and y share
ownership by typing
if ((x.use_count() > 0) && !(x < y) && !(y < x))
but this is long-winded and does not make it clear to a reader what the
coder is trying to do.
Joe Gottman
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