Insert at the specified position in this string the specified numChars copies of the specified character, and return an iterator providing modifiable access to the first inserted character, or a non-const copy of position if 0 == numChars. The behavior is undefined unless position is a valid iterator on this string.
Declared in <bslstl_string.h>
iterator
insert(
const_iterator position,
size_type numChars,
char character);