Namespaces
Variants
Views
Actions

std::chrono::operator<<(std::chrono::month)

From cppreference.com
< cpp‎ | chrono‎ | month
 
 
Utilities library
General utilities
Relational operators (deprecated in C++20)
Integer comparison functions
(C++20)(C++20)(C++20)
(C++20)
Swap and type operations
(C++14)
(C++11)
(C++11)
(C++11)
(C++17)
Common vocabulary types
(C++11)
(C++17)
(C++17)
(C++17)
(C++11)
(C++17)

Elementary string conversions
(C++17)
(C++17)
Stacktrace
 
Date and time utilities
(C++11)
(C++11)
Time of day
(C++20)



(C++20)(C++20)(C++20)(C++20)
Clocks
(C++20)
                                             
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
Calendars
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
Time zones
(C++20)
(C++20)
(C++20)
(C++20)
C-style date and time
 
 
template <class CharT, class Traits>

std::basic_ostream<CharT, Traits>&

operator<<(std::basic_ostream<CharT, Traits>& os, const std::chrono::month& m);
(since C++20)

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>("{:%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.

[edit] Return value

os.

[edit] Notes

This operator<< is primarily intended for debugging use. For control over formatting, use std::format.

[edit] See also

(C++20)
stores formatted representation of the arguments in a new string
(function template) [edit]
specialization of std::formatter that formats a month according to the provided format
(class template specialization) [edit]