std::chrono::operator<<(std::chrono::year)
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std::chrono::year
Member functions
Nonmember functions
operator<<
Helper classes
(C++26)
Defined in header
<chrono>
template< class CharT, class Traits >
(since C++20)
std::basic_ostream <CharT, Traits>&
Forms a std::basic_string <CharT> s consisting of the year value stored in y formatted as a decimal number, left-padded with 0 to four digits if the result would otherwise be less than four digits. Then, if !y.ok(), append " is not a valid year" to the formatted string. Inserts that string into os.
Equivalent to
return os << (y.ok() ?
std::format (STATICALLY_WIDEN<CharT>("{:%Y}"), y) :
std::format (STATICALLY_WIDEN<CharT>("{:%Y} is not a valid year"), y));
where STATICALLY_WIDEN<CharT>("...") is "..." if CharT is char, and L"..." if CharT is wchar_t.
[edit] Return value
os
[edit] Example
Run this code
#include <chrono> #include <iostream> int main() { constexpr std::chrono::year y1{2020}, y2{-020}, y3{98304}; std::cout << y1 << '\n' << y2 << '\n' << y3 << '\n'; }
Possible output:
2020 -0016 -32768 is not a valid year