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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../io/manip/setiosflags.html below:

std::setiosflags - cppreference.com

When used in an expression out << setiosflags(mask) or in >> setiosflags(mask), sets all format flags of the stream out or in as specified by the mask.

[edit] Parameters mask - bitmask of the flags to set [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 << setiosflags(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 >> setiosflags(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 [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 setiosflags 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] clears the specified ios_base flags
(function) [edit]

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