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Igor Kholodov <C.JUMP@prodigy.net> wrote:

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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/