Managing input streams: class istream

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Managing input streams: class istream

Class istream objects are specialized for input; as for ostream, they are derived from ios, so you can use any of the general-purpose methods from that base class. Declarations for this class also come from iostream.h.

See the following documentation’s discussion for more information.

istream::istream ()
Constructor

When used without arguments, the

istream

constructor simply initializes the

ios

object and initializes the input counter (the value reported by

istream::gcount

) to

istream::istream (streambuf* sb [, ostream tie])
Constructor

You can also call the constructor with one or two arguments. The first argument,

, is a

streambuf*

; if you supply this pointer, the constructor uses that

streambuf

for input. You can use the second optional argument

tie

to specify a related output stream as the initial value for

ios::tie

If you use this constructor, the argument,

, is not destroyed (or deleted or closed) when the

ostream

is destroyed.

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