ostreambuf_iteratoroutput_iterator
| Data Types | |
| char_type ostream_type streambuf_type traits_type |
| Member Functions |
| failed() operator*() operator++() operator=() |
#include <streambuf> template<class charT, class traits = char_traits<charT> > class ostreambuf_iterator : public output_iterator
The template class ostreambuf_iterator writes successive characters onto the stream buffer object from which it was constructed. The operator= is used to write the characters and in case of failure the member function failed() returns true.
template<class charT, class traits = char_traits<charT> >
class ostreambuf_iterator
: public output_iterator {
public:
typedef charT char_type;
typedef traits traits_type;
typedef basic_streambuf<charT, traits> streambuf_type;
typedef basic_ostream<charT, traits> ostream_type;
ostreambuf_iterator(ostream_type& s) throw();
ostreambuf_iterator(streambuf_type *s) throw();
ostreambuf_iterator& operator*();
ostreambuf_iterator& operator++();
ostreambuf_iterator operator++(int);
ostreambuf_iterator& operator=(charT c);
bool failed( ) const throw();
};
char_type
The type char_type is a synonym for the template parameter charT.
ostream_type
The type ostream_type is an instantiation of class basic_ostream on types charT and traits:
typedef basic_ostream<charT, traits> ostream_type;
streambuf_type
The type streambuf_type is an instantiation of class basic_streambuf on types charT and traits:
typedef basic_streambuf<charT, traits> streambuf_type;
traits_type
The type traits_type is a synonym for the template parameter traits.
ostreambuf_iterator(ostream_type& s) throw();
Constructs an ostreambuf_iterator that uses the basic_streambuf object pointed at by s.rdbuf()to output characters. If s.rdbuf() is a null pointer, calls to the member function failed() return true.
ostreambuf_iterator(streambuf_type *s) throw();
Constructs an ostreambuf_iterator that uses the basic_streambuf object pointed at by s to output characters. If s is a null pointer, calls to the member function failed() return true.
ostreambuf_iterator& operator=(charT c);
Inserts the character c into the output sequence of the attached stream buffer. If the operation fails, calls to the member function failed() return true.
ostreambuf_iterator& operator++();
Returns *this.
ostreambuf_iterator operator++(int);
Returns *this.
ostreambuf_iterator operator*();
Returns *this.
bool failed() const throw();
Returns true if the iterator failed inserting a characters or false otherwise.
//
// stdlib/examples/manual/ostreambuf_iterator.cpp
//
#include<iostream>
#include<fstream>
void main ( )
{
using namespace std;
// create a filebuf object
filebuf buf;
// open the file iter_out and link it to the filebuf object
buf.open("iter_out", ios_base::in | ios_base::out );
// create an ostreambuf_iterator and link it to
// the filebuf object
ostreambuf_iterator<char> out_iter(&buf);
// output into the file using the ostreambuf_iterator
for(char i=64; i<128; i++ )
out_iter = i;
// seek to the beginning of the file
buf.pubseekpos(0);
// create an istreambuf_iterator and link it to
// the filebuf object
istreambuf_iterator<char> in_iter(&buf);
// construct an end of stream iterator
istreambuf_iterator<char> end_of_stream_iterator;
cout << endl;
// output the content of the file
while( !in_iter.equal(end_of_stream_iterator) )
// use both operator++ and operator*
cout << *in_iter++;
cout << endl;
}
basic_streambuf(3C++), basic_ostream(3C++), istreambuf_iterator(3C++)
Working Paper for Draft Proposed International Standard for Information Systems--Programming Language C++, Section 24.4.4
ANSI X3J16/ISO WG21 Joint C++ Committee
©Copyright 1996, Rogue Wave Software, Inc.