------- Comment #12 from redi at gcc dot gnu dot org 2010-03-01 22:38 -------
Bear in mind that a custom deleter with custom pointer type might have very
different semantics for comparing pointer values and for invoking the deleter.
Consider a custom D::pointer which keeps a generation count, which is not used
when comparing for equality:
template<class T>
struct MyDeleter {
struct pointer {
int generation;
T* ptr;
pointer() : generation(), ptr() { }
bool operator==(pointer rhs)
{ return ptr == rhs.ptr; }
};
void operator()(pointer p) const
{
do_something(ptr.generation);
delete p.ptr;
}
void do_something(int gen);
};
Your suggested implementation would not update the value, because the equality
test is true, but that would be wrong i.e. you would have failed to reset the
unique_ptr as requested by the user.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43183
