strstream

                                basic_ostream
strstreambasic_iostream                      basic_iosios_base
                                basic_istream

• Summary
• Data Type and Member Function Indexes
• Synopsis
• Description
• Interface
• Types
• Constructors
• Destructors
• Member Functions
• Examples
• See Also
• Standards Conformance

Reads and writes to an array in memory.

Data Types
char_type int_type off_type pos_type	traits

Member Functions

freeze() pcount() rdbuf() str()

#include <strstream> 
class strstream
: public basic_iostream<char>

The class strstream reads and writes to an array in memory. It uses a private strstreambuf object to control the associated array. It inherits from basic_iostream<char> and therefore can use all the formatted and unformatted output and input functions.

This is a deprecated feature and might not be available in future versions.

class strstream 
: public basic_iostream<char> {

 public:

  typedef char_traits<char>           traits;
    
  typedef char                       char_type;
  typedef typename traits::int_type  int_type;
  typedef typename traits::pos_type  pos_type;
  typedef typename traits::off_type  off_type;

  strstream();
  strstream(char *s, int n,
            ios_base::openmode = 
            ios_base::out | ios_base::in);

  void freeze(int freezefl = 1);
  int pcount() const;

  virtual ~strstream();
  strstreambuf *rdbuf() const;

  char *str();

};

char_type

The type char_type is a synonym of type char.

int_type

The type int_type is a synonym of type traits::in_type.

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.

traits

The type traits is a synonym of type char_traits<char>.

strstream();

Constructs an object of class strstream, initializing the base class basic_iostream<char> with the associated strstreambuf object. The strstreambuf object is initialized by calling its default constructor strstreambuf().

strstream(char* s, int n, ios_base::openmode
          mode = ios_base::out | ios_base::in); 

Constructs an object of class strstream, initializing the base class basic_iostream<char> with the associated strstreambuf object. The strstreambuf object is initialized by calling one of two constructors:

• If mode & app == 0, calls strstreambuf(s,n,s)

• Otherwise calls strstreambuf(s,n,s + ::strlen(s))

virtual ~strstream();

Destroys an object of class strstream.

void 
freeze(int freezefl = 1); 

If the mode is dynamic, alters the freeze status of the dynamic array object as follows:

• If freezefl is false, the function sets the freeze status to frozen.

• Otherwise, it clears the freeze status.

int 
pcount() const; 

Returns the size of the output sequence.

strstreambuf* 
rdbuf() const; 

Returns a pointer to the strstreambuf object associated with the stream.

char* 
str();

Returns a pointer to the underlying array object, which may be null.

//
// stdlib/examples/manual/strstream.cpp
//
#include<strstream>
using namespace std;

void main ( )
{
  using namespace std;

  // create a bi-directional strstream object 
  strstream inout;

  // output characters
  inout << "Das ist die rede von einem man" << endl;
  inout << "C'est l'histoire d'un home" << endl;
  inout << "This is the story of a man" << endl;

  char p[100];

  // extract the first line
  inout.getline(p,100);

  // output the first line to stdout
  cout << endl << "Deutch :" << endl;
  cout << p;

  // extract the second line
  inout.getline(p,100);

  // output the second line to stdout
  cout << endl << "Francais :" << endl;
  cout << p;

  // extract the third line
  inout.getline(p,100);

  // output the third line to stdout
  cout << endl << "English :" << endl;
  cout << p;
 
  // output the all content of the
  // strstream object to stdout
  cout << endl << endl << inout.str();

}

char_traits(3C++), ios_base(3C++), basic_ios(3C++), strstreambuf(3C++), istrstream(3C++), ostrstream(3c++)

Working Paper for Draft Proposed International Standard for Information Systems--Programming Language C++, Annex D Compatibility features Section D.6.4

ANSI X3J16/ISO WG21 Joint C++ Committee