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Return a substring.
string_view subview( std::size_t pos = 0, std::size_t count = npos) const;
Returns a view of a substring.
Strong guarantee.
          A string_view object referring
          to {data() + pos, std::min(count, size() - pos)).
        
| Name | Description | 
|---|---|
| 
                     | 
                    The index to being the substring at. The default argument for
                    this parameter is  | 
| 
                     | 
                    The length of the substring. The default argument for this parameter
                    is  | 
| Type | Thrown On | 
|---|---|
| 
                     | 
                     |