std::chrono::weekday::ok - cppreference.com (original) (raw)
| 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
#include #include #include #include #include struct weekday_ok : std::numpunct { 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)