Re: [Boost-users] boost::none for boost::shared_ptr

Subject: Re: [Boost-users] boost::none for boost::shared_ptr
From: Gavin Lambert (gavinl_at_[hidden])
Date: 2014-01-30 01:06:51

On 30/01/2014 15:13, Quoth Ben Pope:
>> // invoke g with empty object
>> g(shared_ptr<CSomeReallyLongClassName>());
>
> g(0);

Note that (at least in Boost 1.53, haven't checked if this has been 
changed), .reset(0) is less efficient than .reset() because it still 
allocates a shared_count to the null pointer.

I haven't checked if the constructor has the same issue but it wouldn't 
surprise me.

(Also, the above doesn't compile in 1.53 because the raw pointer 
constructor is marked explicit.  Again, maybe that's been changed in the 
interim.)