Forms a std::basic_string<CharT> s consisting of the day value stored in d formatted as a decimal number, with a leading zero if the result would otherwise be a single decimal digit. Then, if !d.ok(), append " is not a valid day" to the formatted string. Inserts that string into os.
Equivalent to
return os << (d.ok() ?
std::format(STATICALLY_WIDEN<CharT>("{:%d}"), d) :
std::format(STATICALLY_WIDEN<CharT>("{:%d} is not a valid day"), d));
where STATICALLY_WIDEN<CharT>("...") is "..." if CharT is char, and L"..." if CharT is wchar_t.
os
[edit] Example#include <chrono>
#include <iostream>
int main()
{
constexpr std::chrono::day d1{31}, d2{7}, d3{42}, d4{};
std::cout << d1 << '\n'
<< d2 << '\n'
<< d3 << '\n'
<< d4 << '\n';
}
Possible output:
31 07 42 is not a valid day 00 is not a valid day[edit] See also
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4