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          Return true if the key is
          found.
        
bool contains( string_view key) const;
          This function returns true
          if a key with the specified string is found.
        
return this->find(key) != this->end();
          Constant on average, worst case linear in size().
        
No-throw guarantee.
| Name | Description | 
|---|---|
| 
                     | The key of the element to find. |