Re: [Boost-users] [tuple] easy way to bind to get

From: chun ping wang (cablepuff_at_[hidden])
Date: 2007-10-19 13:06:36

http://lists.boost.org/boost-users/2007/01/24529.php

Is this what you want?

On 10/19/07, Chris Weed <chrisweed_at_[hidden]> wrote:
>
> Hi,
> I would like to bind to the boost::get<N> function for use by
> transform iterator.
> This is the pseudo code if get worked like a simple function.
>
> std::vector<tuple<int,int,float> > v(2);
> v[0] = tuple<int,int,float>(2,2,2.2f);
> v[1] = tuple<int,int,float>(3,3,3.3f);
> std::accumulate(
>   boost::make_transform_iterator(
>     v.begin(),
>     boost::lambda::bind(&boost::get<1>,_1)),
>   boost::make_transform_iterator(
>     v.end(),
>     boost::lambda::bind(&boost::get<1>,_1)),
> 0);
>
> I find bind is difficult to use for functions that deduce template
> arguments from function arguments.
>
> I thought if I changed boost::get<1> -> boost::get<1,tuple<int,int,float>
> >
>
> That didn't work either. Digging through tuple.hpp makes my head spin.
> Is there an easy way to do this.
>
> Thanks,
> Chris
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