[boost] Boost Iterable Range Library update (v1.5)

From: John Torjo (john.lists_at_[hidden])
Date: 2004-11-08 04:50:25

Dear boosters,

I have updated the Iterable Range Library (formely known as Range 
Templates Library).

It makes dealing with containers/STL algorithms simpler by using ranges 
(as opposed to iterators).
Simply put, a range is a smarter std::pair<iterator,iterator>.

Here's a taste:
for ( crange<some_array_type> r(some_array); r; ++r)
     do_something( *r, some_data);

Also, the library provides wrappers for all STL algorithms (for the 
purpose of STL algorithms, all containers are ranges as well):

typedef std::vector<std::string> word_array;
word_array v;
// STL version
std::copy( v.begin(), v.end(), print);
// rng:: version
rng::copy( v, print);

Also, the counterparts for STL algorithms that return an iterator will 
return a range, allowing for:
// fill a vector with all the indexes at which a certain string is found
std::string str = "I'm a cool programmer, really cool that is", find = 
"cool";
std::vector<int> result;
crange<std::string> r(str);
while ( r = rng::search(r, find))
     result.push_back ( r.begin() - str.begin() );

And it provides for range adaptors, allowing for composition.

bool from_ro(const employee & e) { return e.country == "Romania"; }
std::string get_empl_name(const employee &e) { return e.name; }

typedef std::vector<employee> array;
array empls;

// take all employees from Romania, and print their names
rng::copy( transformed( filtered(empls,from_ro), get_empl_name),
     std::ostream_iterator<std::string>(std::cout," "));

Changes in this version:
- improved algorithms.hpp (no more use of macros)
- solved small bugs
- added documentation

Download it from here:
http://www.torjo.com/rangelib/

Feedback is welcome.

Best,
John

-- 
John Torjo,    Contributing editor, C/C++ Users Journal
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