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std::basic_...nit_buf_ptrs(3) C++ Standard Libarystd::basic_...nit_buf_ptrs(3) NAME std::basic_stringbuf::init_buf_ptrs - std::basic_string- buf::init_buf_ptrs Synopsis 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 invari- ants of buf while it is held encapsulated in the std::basic_stringbuf, e.g., by writ- ing 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. Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Correct behavior calling init_buf_ptrs() made makes LWG 1448 C++98 pptr() == pbase() + buf.data() pptr() == pbase() + for streams that are both input and output buf.size() streams for append streams http://cppreference.com 2024.06.10 std::basic_...nit_buf_ptrs(3)
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