Dump hex float in C++

I tried following:

std::cout << std::hex << 17.0625;

But it dumped it in decimal. I'd like to see 11.01 (17.0625 in hex). How can I print some floating point value in hex?

Please do not offer solutions like:

void outhexdigits(std::ostream& out, fp_t d, int max_chars=160)
{
    while(d > 0. && max_chars)
    {
        while(d < 1. && max_chars){
            out << '0';
            --max_chars;
            d*=16;
        }

        if (d>=1. && max_chars) {
            int i = 0;
            while (d>=1.)
                ++i, --d;
            out << std::hex << i;
            --max_chars;
        }
    }
}

Is there any way to dump float numbers in hex in STL/boost?