应该std :: chrono :: steady_clock ::现在是noexcept？ [英] Should std::chrono::steady_clock::now be noexcept?

问题描述

我注意到 std :: chrono :: steady_clock :: now 有 noexcept cplusplus.com 上的文档。但是，我没有找到任何规定，在最新的C ++ 11草案（不幸的是我没有标准的副本）。

I've noticed that std::chrono::steady_clock::now has the noexcept specifier in the documentation at cplusplus.com. However, I haven't found any provision for this in the latest C++11 draft (unfortunately I don't have a copy of the standard).

在cplusplus.com文档中的错误或应该 noexcept 说明符的 std :: chrono :: steady_clock :: now ？

Is it a mistake in the cplusplus.com documenation or should std::chrono::steady_clock::now have the noexcept specifier?

推荐答案

§20.11.7.2的C ++ 11标准的定义 steady_clock ：

§ 20.11.7.2 of the C++11 standard's definition of steady_clock:

class steady_clock {
public:
    typedef unspecified rep;
    typedef ratio<unspecified , unspecified > period;
    typedef chrono::duration<rep, period> duration;
    typedef chrono::time_point<unspecified, duration> time_point;
    static const bool is_steady = true;
    static time_point now() noexcept;
};

所以是的， std :: steady_clock :: now c $ c>应该是 noexcept ，它不是文档中的错误。 它似乎cppreference说同样。

So yes, std::steady_clock::now() should be noexcept and it isn't an error in the documentation. It seems cppreference says the same.

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