“Roll-Back” or Undo Any Manipulators Applied To A Stream Without Knowing What The Manipulators Were [duplicate]

Answer 1

The standard manipulators all manipulate a stream's format flags, precision and width settings. The width setting is reset by most formatted output operations anyway. These can all be retrieved like this:

std::ios_base::fmtflags saveflags = std::cout.flags();
std::streamsize prec = std::cout.precision();
std::streamsize width = std::cout.width();

and restored:

std::cout.flags( saveflags );
std::cout.precision( prec );
std::cout.width( width );

Turning this into an RAII class is an exercise for the reader...