std::basic_string_view::substr
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
copy | copies characters (public member function) |
|---|---|
find | find characters in the view (public member function) |
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