std::chrono::weekday_indexed::ok

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std::chrono::weekday_indexed
 
constexpr bool ok() const noexcept;
(C++20 起)

检查存储于 *this 的 weekday 对象和索引是否均合法。

返回值

若 weekday().ok() == true 且 index() 在范围 [1, 5] 中则为 true。否则为 false。

示例

运行此代码
#include <chrono>
#include <iostream>

int main()
{
    std::cout << std::boolalpha;

    std::chrono::weekday_indexed wdi{std::chrono::Tuesday[2]};
    std::cout << (wdi.ok()) << ' ';
    wdi = {std::chrono::weekday(42)[2]}; 
    std::cout << (wdi.ok()) << ' ';
    wdi = {std::chrono::Tuesday[-4]}; 
    std::cout << (wdi.ok()) << '\n';
}

输出： 

true false false