28 Input/output library [input.output]

28.8 String-based streams [string.streams]

28.8.2 Class template basic_­stringbuf [stringbuf]

28.8.2.1 Constructors [stringbuf.cons]

explicit basic_stringbuf(ios_base::openmode which);
Effects: Constructs an object of class basic_­stringbuf, initializing the base class with basic_­streambuf() ([streambuf.cons]), and initializing mode with which.
It is implementation-defined whether the sequence pointers (eback(), gptr(), egptr(), pbase(), pptr(), epptr()) are initialized to null pointers.
Ensures: str() == "".
explicit basic_stringbuf( const basic_string<charT, traits, Allocator>& s, ios_base::openmode which = ios_base::in | ios_base::out);
Effects: Constructs an object of class basic_­stringbuf, initializing the base class with basic_­streambuf() ([streambuf.cons]), and initializing mode with which.
Then calls str(s).
basic_stringbuf(basic_stringbuf&& rhs);
Effects: Move constructs from the rvalue rhs.
It is implementation-defined whether the sequence pointers in *this (eback(), gptr(), egptr(), pbase(), pptr(), epptr()) obtain the values which rhs had.
Whether they do or not, *this and rhs reference separate buffers (if any at all) after the construction.
The openmode, locale and any other state of rhs is also copied.
Ensures: Let rhs_­p refer to the state of rhs just prior to this construction and let rhs_­a refer to the state of rhs just after this construction.
  • str() == rhs_­p.str()
  • gptr() - eback() == rhs_­p.gptr() - rhs_­p.eback()
  • egptr() - eback() == rhs_­p.egptr() - rhs_­p.eback()
  • pptr() - pbase() == rhs_­p.pptr() - rhs_­p.pbase()
  • epptr() - pbase() == rhs_­p.epptr() - rhs_­p.pbase()
  • if (eback()) eback() != rhs_­a.eback()
  • if (gptr()) gptr() != rhs_­a.gptr()
  • if (egptr()) egptr() != rhs_­a.egptr()
  • if (pbase()) pbase() != rhs_­a.pbase()
  • if (pptr()) pptr() != rhs_­a.pptr()
  • if (epptr()) epptr() != rhs_­a.epptr()