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iostream
If you need to use the same stream for input and output, you can use an
object of the class iostream
, which is derived from both
istream
and ostream
.
The constructors for iostream
behave just like the constructors
for istream
.
iostream
constructor simply
allocates a new ios
object, and initializes the input counter
(the value reported by istream::gcount
) to 0
.
streambuf*
; if you supply this pointer,
the constructor uses that streambuf
for input and output.
You can use the optional second argument tie (an ostream*
)
to specify a related output stream as the initial value for
ios::tie
.
As for ostream
and istream
, iostream
simply uses
the ios
destructor. However, an iostream
is not deleted by
its destructor.
You can use all the istream
, ostream
, and ios
methods with an iostream
object.
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