Effects: Initializes the base class with
iostream(&sb),
and
sb with one of the two constructors:
- If
(mode & app) == 0,
then s shall designate the first element of an array of n elements. The constructor is
strstreambuf(s,n,s).
- If
(mode & app) != 0,
then s shall
designate the first element of an array of n elements that contains
an ntbs whose first element is designated by s. The constructor is
strstreambuf(s,n,s + std::strlen(s)).