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Showing content from https://cplusplus.com/reference/ios/ios_base/unsetf/ below:

public member function

std::ios_base::unsetf

void unsetf (fmtflags mask);

Clear specific format flags

Clears the format flags selected in mask.

The parameterized manipulator resetiosflags behaves in a similar way as this member function.

Parameters

mask: Bitmask specifying the flags to be cleared. The flags are specified as a combination of flags of the fmtflags member type.

Return Value none

Example

// modifying flags with setf/unsetf
#include <iostream>     // std::cout, std::ios

int main () {
  std::cout.setf ( std::ios::hex, std::ios::basefield );  // set hex as the basefield
  std::cout.setf ( std::ios::showbase );                  // activate showbase
  std::cout << 100 << '\n';
  std::cout.unsetf ( std::ios::showbase );                // deactivate showbase
  std::cout << 100 << '\n';
  return 0;
}

Output:

Data races Modifies the stream object.
Concurrent access to the same stream object may cause data races.

Exception safetyBasic guarantee: if an exception is thrown, the stream is in a valid state.

See also

ios_base::flags: Get/set format flags (public member function)

ios_base::setf: Set specific format flags (public member function)

ios_base::fmtflags: Type for stream format flags (public member type)

resetiosflags: Reset format flags (function)

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