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Guarantee a minimum capacity.
void reserve( std::size_t n);
          This function adjusts the internal storage (if necessary) to guarantee
          space for at least n bytes.
          Buffer sequences previously obtained using data remain valid, while buffer
          sequences previously obtained using prepare become invalid.
        
| Name | Description | 
|---|---|
| 
                     | The minimum number of byte for the new capacity. If this value is greater than the maximum size, then the maximum size will be adjusted upwards to this value. | 
| Type | Thrown On | 
|---|---|
| 
                     | if n is larger than the maximum allocation size of the allocator. | 
Strong guarantee.