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weekday::ok | ||||
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(C++26) |
constexprbool ok()constnoexcept; | (since C++20) | |
Checks if the weekday value stored in*this is in the valid range, i.e.,[0, 6].
true if the weekday value stored in*this is in the range[0, 6]. Otherwisefalse.
#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(constunsigned u:{0/* Sun */,1/* Mon */,6,7/* Sun */,8,9}){conststd::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)
| retrieves the stored weekday value retrieves ISO 8601 weekday value (public member function)[edit] |
