std::chrono::weekday::ok

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< cpp‎ | chrono‎ | weekday
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C-style date and time
std::chrono::weekday
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

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