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std::less
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std::literals::chrono_literals::operator""h
std::literals::chrono_literals::operator""min
std::literals::chrono_literals::operator""ms
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std::error_category::error_category

STD：错误[医]类别：错误[医]范畴

error_category( const error_category& other ) = delete;(1)(since C++11)
constexpr error_category((2)(since C++14)

构造错误类别对象。

参数

%280%29

例外

2%29

noexcept规格：

noexcept

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