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Erase an element.
iterator erase( const_iterator pos);
            Remove the element pointed to by pos,
            which must be valid and dereferenceable. Thus the end()
            iterator (which is valid but cannot be dereferenced) cannot be used as
            a value for pos. References
            and iterators to the erased element are invalidated. Other iterators
            and references are not invalidated.
          
            Constant on average, worst case linear in size().
          
No-throw guarantee.
An iterator following the last removed element.
| Name | Description | 
|---|---|
| 
                       | An iterator pointing to the element to be removed. |