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        A range X where boost::range_iterator<X>::type is a model of Random
        Access Traversal Iterator.
      
| Name | Expression | Return type | 
|---|---|---|
| Size of range | 
                   | 
                   | 
| Expression | Semantics | Postcondition | 
|---|---|---|
| 
                   | 
                  Returns the size of the Range, that is, its number of elements.
                  Note  | 
                   | 
        boost::size(a) completes in amortized constant time.
      
| Range size | 
                   |