std::chrono::weekday_last::ok

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

检查存储于 *this 的 weekday 对象是否合法。

返回值

weekday().ok()

示例

运行此代码
#include <chrono>
#include <iostream>
 
int main()
{
    std::cout << std::boolalpha;

    auto wdl{std::chrono::Tuesday[std::chrono::last]};
    std::cout << (wdl.ok()) << ' ';

    wdl = {std::chrono::weekday(42)[std::chrono::last]};
    std::cout << (wdl.ok()) << '\n';
}

输出： 

true false