std::chrono::month_weekday_last:: ok

检查所包含的 month 和 weekday_last 对象是否有效。

返回值

month ( ) . ok ( ) && weekday_last ( ) . ok ( )

示例

#include <chrono>
#include <iostream>
int main()
{
    std::cout << std::boolalpha;
    auto mwdl{std::chrono::March/std::chrono::Wednesday[std::chrono::last]};
    std::cout << (mwdl.ok()) << ' ';
    mwdl = {std::chrono::month(3)/std::chrono::weekday(42)[std::chrono::last]}; 
    std::cout << (mwdl.ok()) << '\n';
}

true false