std::chrono::operator<<(std::chrono::month)
<chrono>
std::basic_ostream <CharT, Traits>&
If !m.ok(), inserts unsigned(m) followed by " is not a valid month" to os. Otherwise, forms a std::basic_string <CharT> s consisting of the abbreviated month name for the month represented by m, determined using the locale associated with os, and inserts s into os.
Equivalent to
return os << (m.ok() ?
std::format (os.getloc(), STATICALLY_WIDEN<CharT>("{:L%b}"), m) :
std::format (os.getloc(), STATICALLY_WIDEN<CharT>("{} is not a valid month"), unsigned(m)));
where STATICALLY_WIDEN<CharT>("...") is "..." if CharT is char, and L"..." if CharT is wchar_t.
Contents
[edit] Return value
os
[edit] Notes
This operator<< is primarily intended for debugging use. For control over formatting, use std::format .
[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 |
|---|---|---|---|
| P2372R3 | C++20 | the given locale was used by default | L is needed to use the given locale
|