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12.1 STREAM CLASSES The C++ programming language itself does not include any input/output (I/O) facilities. That is why we have to use the directive
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#include <iostream.h>
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in every program that uses I/O. The ios tream . h header file includes the definitions *for the I/O library. This chapter describes the contents of those files and how they are used. The I/O library defines the following two class hierarchies of stream classes:
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/CELlJ\treLL\ istrstream istringstream ostrstream ostringstream
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The classes that are derived from the ios base class are used for high-level stream processing, while the classes that are derived from the s treambuf base class are used for low-level stream processing. The ios t ream class is the one that we usually use for ordinary I/O. Notice that is it a subclass of both the i stream class and the os tream class, both of which are subclasses of the ios base class. The three classes with f s tream" in their name are used for file processing. The four classes with S trs tr" in their name are used for in-memory string stream processing. The s tdiobuf class is used for combining C++\ stream I/O with the older C I/O functions. 12.2 THE ios CLASS The ios class serves as the base class for the other streamclasses. Its primary purpose is to control the buffer for whatever stream object has been instantiated. This means that the stream controls how characters are inserted into or extracted from the buffer. To do that, the ios object maintains a collection of data members that control properties such as the number base (octal, decimal, hexadecimal) that is to be used, the width of the display field, the number of digits
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CHAP. 121
STREAM I/O
displayed for floating point numbers, etc. We shall examine the pro tee ted part of the ios class here in order to gain a deeper understanding of the functioning interface. Here is part of the ios class:
class ios { public: typedef unsigned long fmtflags; // 32-bit bitstrings typedef unsigned char iostate; // 8-bit bitstrings // other members included here protected: streambuf* -strbuf; // points to buffer ostream* -tie; // points to ostream tied to istream int -width; // width of output field int _prec; // precision for floats char // fill character for padding field - fill; fmtflags // holds all the format flags - flags; iostate -state; // holds the current io state ios(streambuf* -strbuf = 0, ostream* - tie = 0); -ios(); 1; two defined types (f mt f lags and ios ta t e) are unsigned integer types; i.e., bits strings.
The Each of the 32 bits of the data member - flags and each of the 8 bits of the data member -state can be used to represent different Boolean parameters for the stream. The default constructor and the destructor for the ios class are declared protected so that the class cannot be instantiated. Note that the ios data members are all pro tee ted. This means that they are accessible only from within a stream s member functions; they are not accessible from user programs. A stream object is an instance of a subclass of the ios class. So every stream object must have the seven data members declared in the ios class. Such an object x can be imagined like this:
-width _prec
X -f
-strbuf w -tie E t -
- fill lags
The object s seven data members include a pointer to a s t reambu f , a pointer to an os tream, two intS, a char, and two bit strings whose values are represented in octal. The -width parameter determines how wide the output field will be, the srec parameter determines how many digits will be displayed for floats and doubles, and the - f i 11 parameter determines which character will be used for padding a justified field. If this object x is an output stream, then output will use a 15character field with 9-digit precision and the character 1 I for fill. The # - flags and -state data members are bit-strings that hold many booZean parameters. The - s treambuf pointer is used to connect the stream to its buffer, and the - tie pointer is used to tie an input object (like tin) to an output object (like tout).
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