std::resetiosflags(3)

NAME
std::resetiosflags - std::resetiosflags

Synopsis
   Defined in header <iomanip>
   /*unspecified*/ resetiosflags( std::ios_base::fmtflags mask );
   When used in an expression out << resetiosflags(mask) or in >> resetiosflags(mask),
   clears all format flags of the stream out or in as specified by the mask.

Parameters
   mask - bitmask of the flags to clear

Return value
   An object of unspecified type such that
     * if out is an object of type std::basic_ostream<CharT, Traits>, the expression
       out << resetiosflags(mask)
          * has type std::basic_ostream<CharT, Traits>&
          * has value out
          * behaves as if it called f(out, mask)
     * if in is an object of type std::basic_istream<CharT, Traits>, the expression in
       >> resetiosflags(mask)
          * has type std::basic_istream<CharT, Traits>&
          * has value in
          * behaves as if it called f(in, mask)
   where the function f is defined as:
 void f(std::ios_base& str, std::ios_base::fmtflags mask)
 {
     // reset specified flags
     str.setf(ios_base::fmtflags(0), mask);
 }

Example
// Run this code
 #include <iomanip>
 #include <iostream>
 #include <sstream>
 int main()
 {
     std::istringstream in("10 010 10 010 10 010");
     int n1, n2;
     in >> std::oct >> n1 >> n2;
     std::cout << "Parsing \"10 010\" with std::oct gives: " << n1 << ' ' << n2 << '\n';
     in >> std::dec >> n1 >> n2;
     std::cout << "Parsing \"10 010\" with std::dec gives: " << n1 << ' ' << n2 << '\n';
     in >> std::resetiosflags(std::ios_base::basefield) >> n1 >> n2;
     std::cout << "Parsing \"10 010\" with autodetect gives: " << n1 << ' ' << n2 << '\n';
 }

Output:
 Parsing "10 010" with std::oct gives: 8 8
 Parsing "10 010" with std::dec gives: 10 10
 Parsing "10 010" with autodetect gives: 10 8
   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 183 C++98 resetiosflags could only be used with usable with any
                      streams of type std::ostream or std::istream character stream

See also
   setf sets specific format flag
               (public member function of std::ios_base)
   setiosflags sets the specified ios_base flags
               (function)