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std::basic_string_view::substr

性病：基本[医]弦[医]意见：

constexpr basic_string_view substr(size_type pos = 0, size_type count = npos ) const;​(since C++17)

返回子字符串的视图。[pos, pos + rcount)，在哪里rcount是较小的count和size() - pos...

参数

pos-position of the first character
count-requested length

返回值

子字符串的视图[pos, pos + rcount)...

例外

std::out_of_range如果pos > size()...

复杂性

常量。

另见

copycopies characters (public member function)
findfind characters in the view (public member function)

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