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operator<<(std::basic_string_view)
operators (std::basic_string)
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std::basic_string_view::empty

性病：基本[医]弦[医]视图：空

constexpr bool empty() const;​(since C++17)

检查视图是否没有字符，即是否size() == 0...

参数

%280%29

返回值

true如果视图是空的，false否则。

例外

noexcept规格：

noexcept

复杂性

常量。

另见

sizelengthreturns the number of characters (public member function)
max_sizereturns the maximum number of characters (public member function)

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