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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../io/manip/resetiosflags.html below:

std::resetiosflags - cppreference.com

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.

[edit] Parameters mask - bitmask of the flags to clear [edit] 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:

[edit] Example

#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

[edit] 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
streams of type std::ostream or std::istream usable with any
character stream [edit] See also sets specific format flag
(public member function of std::ios_base) [edit] sets the specified ios_base flags
(function) [edit]

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