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istrstream (3)
  • >> istrstream (3) ( Solaris man: Библиотечные вызовы )
  • 
                           Standard C++ Library
                 Copyright 1998, Rogue Wave Software, Inc.
    
    
    NAME
         istrstream
    
          - Reads characters from an array in memory.
    
    
    
    SYNOPSIS
         #include <strstream>
         class istrstream
         : public basic_istream<char>
    
    
    
    DESCRIPTION
         The class istrstream  reads  characters  from  an  array  in
         memory. It uses a private strstreambuf object to control the
         associated    array     object.     It     inherits     from
         basic_istream<char>  and therefore can use all the formatted
         and unformatted input functions.
    
         This is a deprecated feature and might not be  available  in
         future versions.
    
    
    
    INTERFACE
         class istrstream : public basic_istream<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;
    
          explicit istrstream(const char *s);
          istrstream(const char *s, streamsize n);
          explicit istrstream(char *s);
          istrstream(char *s, streamsize n);
    
          virtual ~istrstream();
    
          strstreambuf *rdbuf() const;
          char *str();
    
         };
    
    
    
    TYPES
         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>.
    
    
    
    CONSTRUCTORS
         explicit istrstream(const char* s);
         explicit istrstream(char* s);
    
    
            Constructs an object of  class  istrstream,  initializing
            the  base  class  basic_istream<char> with the associated
            strstreambuf object. The strstreambuf object is  initial-
            ized by calling strstreambuf(s,0), where s designates the
            first element of an NTBS (null terminated byte string).
    
    
    
         explicit istrstream(const char* s, streamsize n);
         explicit istrstream(char* s, streamsize n);
    
    
            Constructs an object of  class  istrstream,  initializing
            the  base  class  basic_istream<char> with the associated
            strstreambuf object. The strstreambuf object is  initial-
            ized by calling strstreambuf(s,n), where s designates the
            first element of an array whose length is n elements  and
            n is greater than zero.
    
    
    
    DESTRUCTORS
         virtual ~istrstream();
    
    
            Destroys an object of class istrstream.
    
    
    
    MEMBER FUNCTIONS
         char*
         str();
    
    
            Returns a pointer to the underlying array object that may
            be null.
    
    
    
         strstreambuf*
         rdbuf() const;
    
    
            Returns a pointer  to  the  private  strstreambuf  object
            associated with the stream.
    
    
    
    EXAMPLE
         //
         // stdlib/examples/manual/istrstream.cpp
         //
         #include<iostream>
         #include<strstream>
    
         void main ( )
         {
          using namespace std;
    
          const char* p="C'est pas l'homme qui prend la mer, ";
          const char* s="c'est la mer qui prend l'homme";
    
           // create an istrstream object and initialize
           // the underlying strstreambuf with p
          istrstream in_first(p);
    
           // create an istrstream object and initialize
           // the underlying strstreambuf with s
          istrstream in_next(s);
    
           // create an ostrstream object
          ostrstream out;
    
           // output the content of in_first and
           // in_next to out
          out << in_first.rdbuf() << in_next.str();
    
           // output the content of out to stdout
          cout << endl << out.rdbuf() << endl;
    
    
           // output the content of in_first to stdout
          cout << endl << in_first.str();
    
           // output the content of in_next to stdout
          cout << endl << in_next.rdbuf() << endl;
    
         }
    
    
    
    SEE ALSO
         char_traits(3C++),     ios_base(3C++),      basic_ios(3C++),
         strstreambuf(3C++), ostrstream(3C++), strstream(3c++)
    
         Working Paper for Draft Proposed International Standard  for
         Information  Systems--Programming Language C++, Annex D Com-
         patibility features Section D.6.2
    
    STANDARDS CONFORMANCE
         ANSI X3J16/ISO WG21 Joint C++ Committee
    
    
    
    


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