2014-03-24 15:05 GMT+04:00 David Roberts <dave@prelert.com>:

In Boost 1.54 I have noticed that lexical_cast from double to string and back is much slower in Visual Studio 2013 (Visual C++ 12) than it was in Visual Studio 2010 (Visual C++ 10).

<...>

Is this already a known issue? If not I can do a bit more investigation to narrow down why it's so much slower, but I don't want to waste my time if this has already been done.

That issue is unknown. I'd really appreciate the investigation.

Try excluding the lexical_cast from test, I have a feeling that this is only MSVC related issue:

#include <sstream>
#include <string>

int main (int, char **)
{
    for (double count = 0.0; count < 1000000.0; count += 1.41)
    {
        std::stringstream ss;
        ss << count;
        std::string result = std::move(ss.str());
        ss.str(std::string());

        ss << result;
        ss >> count;
    }

    return 0;
}

--
Best regards,
Antony Polukhin