Annex D (normative) Compatibility features [depr]

D.6 char* streams [depr.str.strstreams]

D.6.4 Class strstream [depr.strstream]

namespace std {
  class strstream
    : public basic_iostream<char> {
  public:
    // types
    using char_type = char;
    using int_type  = char_traits<char>::int_type;
    using pos_type  = char_traits<char>::pos_type;
    using off_type  = char_traits<char>::off_type;

    // constructors/destructor
    strstream();
    strstream(char* s, int n,
              ios_base::openmode mode = ios_base::in|ios_base::out);
    virtual ~strstream();

    // members
    strstreambuf* rdbuf() const;
    void freeze(bool freezefl = true);
    int pcount() const;
    char* str();

  private:
  strstreambuf sb;  // exposition only
  };
}
The class strstream supports reading and writing from objects of class strstreambuf.
It supplies a strstreambuf object to control the associated array object.
For the sake of exposition, the maintained data is presented here as:
  • sb, the strstreambuf object.

D.6.4.1 strstream constructors [depr.strstream.cons]

strstream();
Effects: Constructs an object of class strstream, initializing the base class with iostream(&sb).
strstream(char* s, int n, ios_base::openmode mode = ios_base::in|ios_base::out);
Effects: Constructs an object of class strstream, initializing the base class with iostream(&sb) and initializing sb with one of the two constructors:
  • If (mode & app) == 0, then s shall designate the first element of an array of n elements.
    The constructor is strstreambuf(s,n,s).
  • If (mode & app) != 0, then s shall designate the first element of an array of n elements that contains an ntbs whose first element is designated by s.
    The constructor is strstreambuf(s,n,s + std​::​strlen(s)).

D.6.4.2 strstream destructor [depr.strstream.dest]

virtual ~strstream();
Effects: Destroys an object of class strstream.

D.6.4.3 strstream operations [depr.strstream.oper]

strstreambuf* rdbuf() const;
Returns: &sb.
void freeze(bool freezefl = true);
Effects: Calls rdbuf()->freeze(freezefl).
char* str();
Returns: rdbuf()->str().
int pcount() const;
Returns: rdbuf()->pcount().