copypasted a for_each function that iterates over a tuple (code from http://codereview.stackexchange.com/a/67394)
copypasted a for_each function that iterates over a tuple (code from http://codereview.stackexchange.com/a/67394)

mflagel/asdf_multiplat,mflagel/asdf_multiplat,mflagel/asdf_multiplat