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Move constructor.
key_value_pair( key_value_pair&& other);
            The pair is constructed by acquiring ownership of the contents of other and shared ownership of other's memory resource.
          
After construction, the moved-from pair holds an empty key, and a null value with its current storage pointer.
Constant.
No-throw guarantee.
| Name | Description | 
|---|---|
| 
                       | The pair to move. |