std::basic_stringbuf<CharT,Traits,Allocator>::init_buf_ptrs

void init_buf_ptrs();		(exposition only*)

Initializes the input and output sequences from buf according to mode. buf and mode are exposition-only data members of *this

Immediately after this function returns:

• If std::ios_base::out is set in mode, pbase() points to buf.front() and epptr( ) >= pbase( ) + buf.size ( ) is true;
  • in addition, if std::ios_base::ate is set in mode, pptr( ) == pbase( ) + buf.size ( ) is true
  • otherwise pptr() == pbase() is true
• If std::ios_base::in is set in mode, eback() points to buf.front(), and gptr( ) == eback( ) && egptr( ) == eback( ) + buf.size ( ) is true

Notes

For efficiency reasons, stream buffer operations can violate invariants of buf while it is held encapsulated in the std::basic_stringbuf, e.g., by writing to characters in the range [ buf.data() + buf.size() ,  buf.data() + buf.capacity() )

All operations retrieving a std::basic_string from buf ensure that the std::basic_string

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR	Applied to	Behavior as published	Correct behavior
LWG 1448	C++98	calling init_buf_ptrs() made pptr( ) == pbase( ) + buf.data ( )	makes pptr( ) == pbase( ) + buf.size ( )