std::chrono::month_weekday::ok

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

检查所含的 month 和 weekday_indexed 对象是否均合法。

返回值

month().ok() && weekday_indexed().ok()

示例

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

int main()
{
    auto mwdi{std::chrono::March/std::chrono::Friday[1]};
    assert(mwdi.ok());

    mwdi = {std::chrono::month(17)/std::chrono::Friday[1]}; 
    assert(not mwdi.ok());

    mwdi = {std::chrono::March/std::chrono::Friday[-4]}; 
    assert(not mwdi.ok());
}