Annex D (normative) Compatibility features [depr]

D.12 char* streams [depr.str.strstreams]

D.12.5 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:

(1.1)
sb, the strstreambuf object.

D.12.5.1 strstream constructors [depr.strstream.cons]

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strstream();

Effects: Initializes the base class with iostream(&sb).

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

Effects: Initializes the base class with iostream(&sb), and sb with one of the two constructors:

(2.1)
If (mode & app) == 0, then s shall designate the first element of an array of n elements. The constructor is strstreambuf(s,n,s).
(2.2)
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.12.5.2 strstream destructor [depr.strstream.dest]

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virtual ~strstream();

Effects: Destroys an object of class strstream.

D.12.5.3 strstream operations [depr.strstream.oper]

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strstreambuf* rdbuf() const;

Returns: const_cast<strstreambuf*>(&sb).

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void freeze(bool freezefl = true);

Effects: Calls rdbuf()->freeze(freezefl).

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char* str();

Returns: rdbuf()->str().

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int pcount() const;

Returns: rdbuf()->pcount().