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Append to the string.
constexpr basic_static_string& operator+=( const_pointer s);
            Appends count characters
            from the string pointed to by s
            to the end of the string, where count
            is traits_type::length(s).
          
Strong guarantee.
            *this
          
| Name | Description | 
|---|---|
| 
                       | The string to append. | 
| Type | Thrown On | 
|---|---|
| 
                       | 
                       |