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Showing content from https://en.cppreference.com/w/cpp/language/../keyword/../io/basic_stringbuf/init_buf_ptrs.html below:

std::basic_stringbuf<CharT,Traits,Allocator>::init_buf_ptrs - cppreference.com

void init_buf_ptrs();

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.

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 invariants hold on the returned value.

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

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