STDIOBUF(3CC4)STDIOBUF(3CC4)NAMEstdiobuf - buffer and stream classes for use with C stdio
SYNOPSIS
#include <stdiostream.h> // includes <iostream.h> and <stdio.h>
class stdiobuf : public streambuf {
public:
stdiobuf(FILE*);
FILE* stdiofile();
};
class stdiostream : public ios {
public:
stdiostream(FILE*);
stdiobuf* rdbuf();
};
DESCRIPTION
The stdiobuf class is a specialization of streambufs using a C stdio
FILE as an intermediary to an actual file which is the source or desti‐
nation of characters. The basic streambuf operations are as described
in sbufprot(3CC4) and sbufpub(3CC4). Input, output, and seek opera‐
tions are reflected in changes to the associated FILE. The seek func‐
tions are implemented in terms of fseek(), for example.
The stdiostream provides a C++ interface to a C stdio FILE. It has a
stdiobuf as its buffer. It is not a full implementation of iostreams;
it has only the buffer-class and ios-class functionality. C++ I/O is
done via per-character calls to the C stdio getc() and putc() func‐
tions. There is no normal buffering, since that would break synchro‐
nization of the C and C++ accesses.
The only reason to use either of these classes is to provide a way to
mix C stdio code and C++ iostream-like code on the same file. Prefer
to use filebuf and fstream, which are far more efficient, for new code.
stdiobuf functions
stdiobuf(fp)
Constructs a stdiobuf attached to the FILE structure pointed to
by fp.
FILE* fp = siobuf.stdiofile()
Returns a pointer to the FILE structure associated with siobuf.
stdiostream functions
stdiostream(fp)
Constructs a stdiostream attached to the FILE structure pointed
to by fp.
stdiobuf* sbp = siostr.rdbuf()
Returns a pointer to the stdiobuf associated with siostr. This
is the same as ios::rdbuf(), except that the return type is
specifically a stdiobuf.
SEE ALSOios.intro(3CC4), ios(3CC4), sbufprot(3CC4), sbufpub(3CC4), stdio(3C),
C++ Library Reference, Chapter 3, "The Classic iostream Library"
08 August 2000 STDIOBUF(3CC4)
