[boost] Re: non-member reset()

From: Daniel Frey (d.frey_at_[hidden])
Date: 2005-01-27 19:04:21

David Abrahams wrote:
> Rob Stewart <stewart_at_[hidden]> writes:
> 
>>From: =?ISO-8859-1?Q?S=E9rgio_Vale_e_Pace?= <svpace.forum_at_[hidden]>
>>
>>>On Wed, 26 Jan 2005 16:48:41 +0100, Stefan Slapeta <stefan_at_[hidden]> wrote:
>>>
>>>>do we have a non-member reset() somewhere? Something like
>>>>
>>>>template <typename T>
>>>>void reset(T& t)
>>>>{
>>>>     std::swap(t, T());
>>>>}
>>>>
>>>>(of course to be refined...)
>>>
>>>why not :
>>>
>>>template <typename T>
>>>void reset(T& t)
>>>{
>>>    t = T();
>>>}
>>
>>swap() is typically as fast as or faster than copy assignment, 
> 
> Not for many types that one might like to reset, such as pointers,
> shared_ptr<T>, and integral types.

What about exception safety guarantees of assignment vs. swap? 
Personally, I'd say these are more important to think about than speed...

Regards, Daniel