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std::literals::chrono_literals::operator""ms
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std::error_code::clear

STD：错误[医]代码：：清空

void clear(​(since C++11)

用默认值替换错误代码和错误类别。

相当于*this = error_code(0,std::system_category())...

参数

%280%29

返回值

%280%29

例外

noexcept规格：

noexcept

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