[boost] Re: immutable string

From: Igor Kholodov (C.JUMP_at_[hidden])
Date: 2004-09-26 20:00:24

>>> Igor Kholodov <C.JUMP_at_[hidden]> wrote:
>>>
>>>> I am testing immutable string outside boost, using
>> it
>>>> as string type with common text transformation
>> library
>>>> (http://cttl.sourceforge.net/). It works quite 
well,
>>>> about 18% speed is gained while parsing large XML
>>>> documents (>1MB) when using const_string.
>>>
>>> Could you please specify the compiler and STL
>> implementation you use?
>>>
>>
>> Tested with GCC 3.4.1 (mingw) and GCC 3.2.3 on 
linux.
>
>Then, I think, the results are very good because GNU 
ISO  
>C++ implementation of std::basic_string<> uses 
representation sharing with  
>reference counting, which is the same thing that 
const_string<> does. The  
>only difference between the std::basic_string<> and 
const_string<> is that  
>the latter one uses small string optimization, and, I 
think, this is what  
>makes it look better.
>

Glad if this helps. Any plans in the future
to add reverse iterator support to const_string?
I wrote some code to work around the absence
of const_reverse_iterator, rbegin(), and rend(),
all of which would be nice to have available.
Regards,

Igor Kholodov
http://cttl.sourceforge.net/