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std::basic_string_view::at

性病：基本[医]弦[医]意见：at

constexpr const_reference at(size_type pos) const;​(since C++17)

返回对指定位置的字符的引用。pos执行边界检查，类型除外std::out_of_range将引发无效访问。

参数

pos-position of the character to return

返回值

引用请求的字符。

例外

抛出std::out_of_range如果pos >= size()...

复杂性

常量。

另见

operator[]access specified character (public member function)

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