Re: [Boost-users] [string algorithms] trim, functors

Subject: Re: [Boost-users] [string algorithms] trim, functors
From: Gaydov Victor (victor.gaydov_at_[hidden])
Date: 2010-04-12 15:20:28

On Sun, 2010-04-11 at 21:02 +0200, Pavol Droba wrote: 
> Hi,
> 
> On 11. 4. 2010 19:40, Mathias Gaunard wrote:
> > Gaydov Victor a écrit :
> >> Hello. Could you answer these two questions:
> >>
> >> 1. Are there trim range algorithms that work with iterators, instead of
> >> strings? (I didn't find such). If not, why not to add them? Something
> >> like this: http://pastebin.org/146696
> > 
> > You found it yourself: boost::algorithm::detail::trim_end
> > I suppose it could become first-class, but there are better solutions,
> > like taking a range and returning a subrange.

Is it ok, generally, to expect the code using functions from detail:: to
work with future versions of boost?

> What's the error? I guess it doesn't work because it doesn't have a 
> result_type typedef.

Yes.

> You are trying to mix apples with oranges. classification predicates in StringAlgo
> library are not compatible with standard stl functors, because they have templated operator.
> This is very useful, since you don't have to provide explicit type when passing to an algorithm.
> 
> The library provides a set of basic combinators. You can simply write (!boost::is_space() ||
> boost::is_digit). Just check the documentation.

Thank you. I understand now.

> In addition you can use boost::lambda tools. All classification predicates are compatible with it.
> 
> Best Regards,
> Pavol.