size_type copy(charT* s, size_type n, size_type pos = 0) const;
Let
rlen be the smaller of
n and
size() - pos.Throws:
out_of_range
if
pos > size(). Requires:
[s, s + rlen) is a valid range
. Effects:
Equivalent to:
traits::copy(s, data() + pos, rlen). [
 Note: This does not terminate
s with a null object
. —
 end note  ]