Re: [boost] [string_convert] efficiency of to_string_classic

From: Martin Adrian (adrianm_at_[hidden])
Date: 2006-05-10 01:22:31

Alexander Nasonov <alnsn <at> yandex.ru> writes:

> 
> I played with to_string_classic from
> 
>     vault / Strings - Text Processing / string_convert.zip
> 
> It's faster then ostringstream but not much:

That is expected since the default implementation of to_string_classic use 
streams. Any speedup is due to my special stream implementation which avoids 
some memory allocations and string copies (20% faster is more than I expected)

The idea behind the to_string_classic is that you can specialize it for common 
types. Something you can't do with e.g. lexical_cast since it uses the default 
locale.
(The to_string_classic interface might need to be changed to allow 
specialization though, never tested it)

You could also check the figures with the string_convert class where the 
stream is reused.

string_convert conv<std::string>(std::locale::classic());

for(int i = 0; i < 10000000; ++i)
  x += conv.to_string(i)[i % 2];

Nice to know that my library works on both intel and gcc