Re: [Boost-users] [boost-users] [bind][function] - too many copies

Subject: Re: [Boost-users] [boost-users] [bind][function] - too many copies
From: OvermindDL1 (overminddl1_at_[hidden])
Date: 2010-10-07 18:50:16

On Thu, Oct 7, 2010 at 8:53 AM, Lorimer, Stephen
<stephen.lorimer_at_[hidden]> wrote:
> For a given member function of the form void foo::f0(), passing this to
> boost bind results in the class instance being copied 7 times.
>
>
>
> Storing the result of bind in boost function incurs another 11 copies
>
>
>
> (code and results are here: http://boost.codepad.org/6jBmoKuj)
>
>
>
> Using tr1::bind and function has slightly better results, but still not
> ideal: Doing just tr1::bind results in the class instance being copied 4
> times.
>
>
>
> Storing the result of bind in tr1 function incurs another 3 copies
>
>
>
> (code and results are here: http://boost.codepad.org/w1EV6JBY)
>
>
>
> Am I right in saying this is because boost::bind uses normal templates while
> tr1::bind uses variadic templates?
>
>
>
> Either way this is not very efficient. Is there a way to improve this?

It is efficient enough if your functor is truly lightweight as it
should be since then no data is actually copied and it vanishes.

On Thu, Oct 7, 2010 at 8:53 AM, Lorimer, Stephen
<stephen.lorimer_at_[hidden]> wrote:
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