Re: [boost] More on Loki style smart_ptr

From: Peter Dimov (pdimov_at_[hidden])
Date: 2002-04-27 04:52:11

From: "Gennadiy Rozental" <rogeeff_at_[hidden]>
> 9. I checked current smart_ptr_test.cpp using my generators.  With
exclusion
> of missing operator[] all test are passing (well, 3 are failing but this
is
> because I have for smart_ptr<...>  v => v.use_count() = 0, while current
> implementation gives 1. Is there specific reason why is that? )

use_count() is the number of shared_ptr copies in existence.

shared_ptr<int> v; // v.use_count() == 1
shared_ptr<int> v2(v); // v.use_count() == 2

use_count() == 0 means no shared_ptr objects; this is only possible when you
check the use_count() via a weak_ptr.