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Return a pointer to an element, or nullptr if the index is invalid.
value* if_contains( std::size_t pos);
            This function returns a pointer to the element at index pos when the index is less then the
            size of the container. Otherwise it returns null.
          
if( auto p = arr.if_contains( 1 ) ) std::cout << *p;
Constant.
No-throw guarantee.
| Name | Description | 
|---|---|
| 
                       | The index of the element to return. |