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            Returns the result type of flatten, given the input sequence
            type.
          
template< typename Sequence > struct flatten { typedef unspecified type; };
Table 1.105. Parameters
| Parameter | Requirement | Description | 
|---|---|---|
| 
                       | A model of Forward Sequence | Operation's argument | 
result_of::flatten<Sequence>::type
Return type:
            Semantics: Returns a sequence with all
            the leaf elements of Sequence.
          
Constant.
#include <boost/fusion/algorithm/transformation/flatten.hpp> #include <boost/fusion/include/flatten.hpp>