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Access an element, with bounds checking.
value const& at( std::size_t pos) const;
            Returns a reference to the element specified at location pos, with bounds checking. If pos is not within the range of the
            container, an exception of type std::out_of_range
            is thrown.
          
Constant.
| Name | Description | 
|---|---|
| 
                       | A zero-based index. | 
| Type | Thrown On | 
|---|---|
| 
                       | 
                       |