Hi! I just discovered this nice functionality in boost, but while trying something as simple as calculating a mean from a set of numbers, I hit a strange drawback: It seems to be impossible to use the same accumulator again for a different set of numbers, because I cannot clear/ reset it. I found some old (ok, March 2009) discussions about this, but nothing in the documentation. By the way, does the accumulator do something to prevent an overflow when I add up everything into one variable? And does it prevent a loss of precision, when at a late stage the variable I sum everything into is very big, but the thing I add is very small? Maybe it would be a good idea to mention this in the documentation, as well... Many thanks in advance for any help Tim