Re: [Boost-users] Boost.stringalgo

Subject: Re: [Boost-users] Boost.stringalgo
From: Pavol Droba (droba_at_[hidden])
Date: 2009-10-28 14:43:49

Hello,

Marcia Chadly wrote:
> Compiling the folowing using is_iless as the predicate for a multi index
> container results in errors.  When is_less is used instead, it compiles
> fine.
> 
>  
> 
>     typedef mi::multi_index_container<
> 
>         GTLayer,
> 
>         mi::indexed_by<
> 
>             mi::sequenced<>, // list-like index
> 
>             mi::ordered_unique<
> 
>                 mi::tag<name>,
> 
>                 mi::const_mem_fun<GTLayer, std::string,
> &GTLayer::GetLayerName>,
> 
>                 //std::greater<std::string>
> 
>                 ::boost::algorithm::is_iless  // names sorted
> 

It's a common misconception, that is_iless is for a string comparison.
Its isn't actually. It is designed to compare characters and it is used
as as pluging to string processing algorithms, that work on character-by-character
basis.

And it does not provide unary_function interface, since its operators is template based
for convenience.

Best Regards,
Pavol