Standard C++ Library
Copyright 1998, Rogue Wave Software, Inc.
NAME
basic_stringstream, stringstream
- Supports writing and reading objects of class
basic_string<charT,traits,Alocator> to/from an array in
memory.
SYNOPSIS
#include <sstream>
template<class charT, class traits = char_traits<charT>,
class Allocator = allocator<charT> >
class basic_stringstream
: public basic_iostream<charT, traits>
DESCRIPTION
The template class
basic_stringstream<charT,traits,Allocator> reads and writes
to an array in memory. It supports writing and reading
objects of class basic_string<charT,traits,Alocator>. It
uses a basic_stringbuf object to control the associated
storage. It inherits from basic_iostream_and therefore can
use all the formatted and unformatted output and input func-
tions.
INTERFACE
template<class charT, class traits = char_traits<charT>,
class Allocator = allocator<charT> >
class basic_stringstream
: public basic_iostream<charT, traits> {
public:
typedef traits traits_type;
typedef charT char_type;
typedef typename traits::int_type int_type;
typedef typename traits::pos_type pos_type;
typedef typename traits::off_type off_type;
typedef basic_stringbuf<charT, traits, Allocator> sb_type;
typedef basic_ios<charT, traits> ios_type;
typedef basic_string<charT, traits, Allocator>
string_type;
explicit basic_stringstream(ios_base::openmode which =
ios_base::out | ios_base::in);
explicit basic_stringstream(const string_type& str,
ios_base::openmode which =
ios_base::out | ios_base::in);
virtual ~basic_stringstream();
basic_stringbuf<charT,traits,Allocator> *rdbuf() const;
string_type str() const;
void str(const string_type& str);
};
TYPES
char_type
The type char_type is a synonym for the template parame-
ter charT.
int_type
The type int_type is a synonym of type traits::in_type.
ios_type
The type ios_type is an instantiation of class basic_ios
on type charT.
off_type
The type off_type is a synonym of type traits::off_type.
pos_type
The type pos_type is a synonym of type traits::pos_type.
sb_type
The type sb_type is an instantiation of class
basic_stringbuf on type charT.
string_type
The type string_type is an instantiation of class
basic_string on type charT.
stringstream
The type stringstream is an instantiation of class
basic_stringstream on type char:
typedef basic_stringstream<char> stringstream;
traits_type
The type traits_type is a synonym for the template param-
eter traits.
wstringstream
The type wstringstream is an instantiation of class
basic_stringstream on type wchar_t:
typedef basic_stringstream<wchar_t> wstringstream;
CONSTRUCTORS
explicit basic_stringstream(ios_base::openmode which =
ios_base::in | ios_base::out);
Constructs an object of class basic_stringstream, ini-
tializing the base class basic_iostream with the associ-
ated string buffer. The string buffer is initialized by
calling the basic_stringbuf constructor
basic_stringbuf<charT,traits,Allocator>(which).
explicit basic_stringstream(const string_type& str,
ios_base::openmode which =
ios_base::in | ios_base::out);
Constructs an object of class basic_stringstream, ini-
tializing the base class basic_iostream with the associ-
ated string buffer. The string buffer is initialized by
calling the basic_stringbuf constructor
basic_stringbuf<charT,traits,Allocator>(str,which).
DESTRUCTORS
virtual ~basic_stringstream();
Destroys an object of class basic_stringstream.
MEMBER FUNCTIONS
basic_stringbuf<charT,traits,Allocator>*
rdbuf() const;
Returns a pointer to the basic_stringbuf associated with
the stream.
string_type
str() const;
Returns a string object of type string_type whose con-
tents is a copy of the underlying buffer contents.
void
str(const string_type& str);
Clears the string buffer and copies the string object str
into it. If the opening mode is in, initializes the input
sequence to point to the first character of the buffer.
If the opening mode is out, initializes the output
sequence to point to the first character of the buffer.
If the opening mode is out | app, initializes the output
sequence to point to the last character of the buffer.
EXAMPLE
//
// stdlib/examples/manual/stringstream.cpp
//
#include<iostream>
#include<sstream>
void main ( )
{
using namespace std;
// create a bi-directional wstringstream object
wstringstream inout;
// output characters
inout << L"Das ist die rede von einem man" << endl;
inout << L"C'est l'histoire d'un home" << endl;
inout << L"This is the story of a man" << endl;
wchar_t p[100];
// extract the first line
inout.getline(p,100);
// output the first line to stdout
wcout << endl << L"Deutch :" << endl;
wcout << p;
// extract the second line
inout.getline(p,100);
// output the second line to stdout
wcout << endl << L"Francais :" << endl;
wcout << p;
// extract the third line
inout.getline(p,100);
// output the third line to stdout
wcout << endl << L"English :" << endl;
wcout << p;
// output the all content of the
//wstringstream object to stdout
wcout << endl << endl << inout.str();
}
SEE ALSO
char_traits(3C++), ios_base(3C++), basic_ios(3C++),
basic_stringbuf(3C++), basic_string(3C++),
basic_istringstream(3C++), basic_ostringstream(3c++)
Working Paper for Draft Proposed International Standard for
Information Systems--Programming Language C++, Section
27.7.3
STANDARDS CONFORMANCE
ANSI X3J16/ISO WG21 Joint C++ Committee