Re: [Boost-users] [Ranges] make_view: when will it be part of a release?

Subject: Re: [Boost-users] [Ranges] make_view: when will it be part of a release?
From: Thorsten Ottosen (thorsten.ottosen_at_[hidden])
Date: 2009-01-12 04:12:03

Max skrev:
>> I recently had the need to produce from a vector<uint> a string
>> representation (like for IPs) like "23.1.4.742.234.0".
>>
>> I thought that if only those were uints were strings I could
>> boost::join them together.
>>
>> After a bit of searching the internet I found: make_view... very helpful,
> as
>> indeed operating on iterators and containers only is a bit restrictive.
>>
>> So, first, I'd like to express my thanks for providing such
>> helpful libraries (I love it how Boost.Bind and ASIO fit together, e.g.!).
>> Great job everyone!
>>
>> Is there a better way to get to the string
>> representation hinted to above? What I did is:
>>
>> #include <boost/view.hpp> // not yet part of Boost 1.37
>>
>>    // Helper to convert an uint to a std::string
>>    struct Stringer
>>    {
>>       std::string operator() (unsigned u) const
>>       {
>>          return boost::lexical_cast<std::string>(u);
>>       }
>>    };
>>
>>    boost::function<std::string(unsigned)> stringer = Stringer();
>>    // way better than writing the loop by hand!
>>    std::string s = boost::join(boost::make_view(data_, stringer), ".");
>>    // Does not compile with gcc 4.2.1
>>    // std::string s = boost::join(boost::make_view(data_, Stringer()),
> ".");
>> Is there some existing class that makes my helper class Stringer
>> unnecessary? (Can I use lexical_cast here w/o a helper class?)
>> Is it possible to avoid putting the functor into a local Boost.Function
>> variable?
> 
> The Lambda lib is powerful in creating in-place unnamed function object,
> isn't it? Have you ever considered it?
> 
>> When will range_ex and make_view() be part of a Boost release? 1.38?
>> (Please?)
> 
> I also have interest to know the answer.

The review is not scheduled exactly yet, but I'm the review manager ... 
I'm still awaiting some updates from Neil, but my guess is that the 
review will happen in february.

-Thorsten