Re: [boost] SuperString v2 in the vault

From: Tomas (pecholt_at_[hidden])
Date: 2006-07-11 08:41:15

I find your improvements over string class interface very valuable. Is there 
any hope to incorporate these changes directly into basic_string in the 
future C++ standard? I mean it's fine we now have super_string class but the 
fact we have two string classes for the same thing is confusig. And if 
super_string is superset and better than std::string why not replace it?

Tomas

"Jeff Garland" <jeff_at_[hidden]> píse v diskusním príspevku 
news:44B194C1.8080903_at_crystalclearsoftware.com...
> Thanks all for the discussion/suggestions on the first version.  As usual
> Boosters have very helpful suggestions.  I've uploaded version 2 of
> super_string to the vault and put an improved set of documentation online:
>
> http://www.crystalclearsoftware.com/libraries/super_string/index.html
>
> Vault location:
>
> http://tinyurl.com/dbcye
>
> Probably the biggest thing in this version is an immutable version using 
> the
> proposed boost::const_string.
>
> http://www.crystalclearsoftware.com/libraries/super_string/classbasic__const__super__string.html
>
> After using it a bit, it seems to me that the immutable approach is likely
> viable for most applications.  To see the impact, I wrote a little 
> performance
> test.  On mutating operations const_super_string is clearly slower.  The
> benefit on non-mutating operations is minimal. However, this version is
> probably not as optimized as possible and it under emphasizes allocation, 
> so I
> expect in actual practice the mutable version may better than these tests
> demonstrate. Your mileage may vary.
>
> 10 trials 500000 iterations/trial
> const append test   --> total elapsed: 00:00:25.071687
> mutable append test --> total elapsed: 00:00:21.904486
>
> 10 trials 1000000 iterations/trial
> const trim test     --> total elapsed: 00:00:14.977803
> mutable trim test   --> total elapsed: 00:00:11.693688
>
> 10 trials 100000 iterations/trial
> const contains regex test   --> total elapsed: 00:00:27.044718
> mutable contains regex test --> total elapsed: 00:00:27.633608
>
> 10 trials 100000 iterations/trial
> const split regex test   --> total elapsed: 00:00:16.517079
> mutable split regex test --> total elapsed: 00:00:17.582708
>
> Other notable changes in this version:
>
> * Make modification functions chainable -- thanks Mark Mutz
> * Add append_file function -- Thx to suggestion by Pavel Vozenilek
>
>     super_string data;
>     data.append_file("data1.txt").append_file(data2.txt);
>
> * Type conversion with user supplied stringstream
>
>     std::ostringstream ss;
>     s.setprecision(
>     super_string s;
>     ss << std::setprecision(3);
>     double dbl = 1.987654321;
>     int i = 1000;
>     s.append(dbl, i, i, " stuff", dbl, ss);
>     //s == "1.99 1000 1000 1.99 stuff 1.99"
>     //ss -- has been modified
>
> * Add boost.format capabilities -- Thx to suggestion by Pavel Vozenilek
>
>     super_string s;
>     double d = 1.123456789;
>     int i = 1000;
>     s.append_formatted(d, i , d, i, "a string", "%-7.2f %-7d %-7.2f %-7d 
> %s");
>     //s == "1.12   1000  1.12   1000   a string"
>
> * Removed all const _copy overloads in mutable string to reduce the api 
> size.
> * Add additional template overloads to support multi-append cases like 
> double
>
>     double d = 1.54;
>     int i = 25;
>     s.append("double: ", d, " is ", i); Currently up to 5 parameters
>
> Enjoy,
>
> Jeff
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