NAME¶

std::chrono::weekday::ok - std::chrono::weekday::ok

Synopsis¶

constexpr bool ok() const noexcept; (since C++20)

Checks if the weekday value stored in *this is in the valid range, i.e., [0, 6].

Return value¶

true if the weekday value stored in *this is in the range [0, 6]. Otherwise false.

Example¶

// Run this code

#include <chrono>
#include <iomanip>
#include <iostream>
#include <locale>
#include <string>

struct weekday_ok : std::numpunct<char>
{
std::string do_truename() const override { return " (is valid weekday)"; }
std::string do_falsename() const override { return " (is not valid weekday)"; }
};

int main()
{
std::cout.imbue(std::locale(std::cout.getloc(), new weekday_ok));
std::cout << std::boolalpha;

for (const unsigned u : {0 /* Sun */, 1 /* Mon */, 6, 7 /* Sun */, 8, 9})
{
const std::chrono::weekday wd{u};
std::cout << "u: " << u << "; wd: " << wd.c_encoding() << wd.ok() << '\n';
}
}

Output:¶

u: 0; wd: 0 (is valid weekday)
u: 1; wd: 1 (is valid weekday)
u: 6; wd: 6 (is valid weekday)
u: 7; wd: 0 (is valid weekday)
u: 8; wd: 8 (is not valid weekday)
u: 9; wd: 9 (is not valid weekday)

See also¶

c_encoding retrieves the stored weekday value
iso_encoding retrieves ISO 8601 weekday value
(public member function)