Re: [Boost-users] converting value before inserting into a list

From: Gottlob Frege (gottlobfrege_at_[hidden])
Date: 2006-09-19 11:08:11

On 9/19/06, Alexander Shyrokov <shirokov_at_[hidden]> wrote:
>
> I want to convert values according to a map before inserting it into the
> list. What is a proper way to do that?
> I have this:
>
> map<int,int> m;
> vector<int> a,b;
>
> for(vector<int>const_iterator i=a.begin();i!=a.end();++i)
>         b.push_back(m[*i]);
>
> I could use std::copy with std::back_inserter to add elements to b, but
> how do I convert it first? Should I write my own version of
> back_inserter for that?
>
> copy(a.begin(),a.end(),my_back_inserter(b,m));
>
> Thanks.
> --
> Regards,
>      Alexander.                http://sjcomp.com
>

I would probably write

for(vector<int>const_iterator i=a.begin();i!=a.end();++i)
        b.push_back(m[*i]);

(yes, I understand that's your original.)

Tony