Re: [boost] [mpl] select1st

From: John Torjo (john.lists_at_[hidden])
Date: 2003-11-20 05:30:18

>>
>> Something like:
>> std::map< std::string, int> c;
>> std::vector<std::string> v;
>>
>> // copy all the keys into v
>> std::copy( c.begin(), c.end(),
>>  boost::bind<std::string>( select1st(), std::back_inserter(v));
>>
>> Can select1st be used, or is there some other utility function? Thanks.
> 
> 
> This is a compile time equivalent of your code:
> 
>   typedef mpl::vector<
>       mpl::pair<.., ..>
>     , mpl::pair<.., ..>
>     , ...
>   > c;
> 
>   typedef mpl::transform<
>       c
>     , mpl::select1st<>
>   >::type v;
> 

Thanks.
Thought it was too easy ;)
Anyway, did my own thing.
(needed it for use in the rtl;))

Best,
John