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std::basic_string_view::front

性病：基本[医]弦[医]视图：：正面

constexpr const_reference front() const;​(since C++17)

返回对视图中第一个字符的引用。如果empty() == true...

参数

%280%29

返回值

引用第一个字符，相当于operator[](0)...

复杂性

常量。

另见

backaccesses the last character (public member function)
emptychecks whether the view is empty (public member function)

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