std::chrono::weekday::ok
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std::chrono::weekday
Member functions
weekday::ok
Nonmember functions
Helper classes
(C++26)
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].
[edit] Return value
true if the weekday value stored in *this is in the range [0, 6]. Otherwise false.
[edit] 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)