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Access a character with bounds checking.
constexpr const_reference at( size_type pos) const;
            Returns a reference to the character at index pos.
          
Constant.
Strong guarantee.
| Name | Description | 
|---|---|
| 
                       | The index to access. | 
| Type | Thrown On | 
|---|---|
| 
                       | 
                      pos >=  |