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Returns a new sequence without nested sequences.
template< typename Sequence > typenameresult_of::flatten<Sequence>::type flatten(Sequence& seq); template< typename Sequence > typenameresult_of::flatten<Sequence const>::type flatten(Sequence const& seq);
Table 1.86. Parameters
| Parameter | Requirement | Description | 
|---|---|---|
| 
                       | A model of Forward Sequence | Operation's argument | 
flatten(seq);
Return type:
            Semantics: Returns a new sequence containing
            all the leaf elements of seq.
          
Constant. Returns a view which is lazily evaluated.
#include <boost/fusion/algorithm/transformation/flatten.hpp> #include <boost/fusion/include/flatten.hpp>
constvector<int, int,vector<int, int>, int> vec(1, 2,make_vector(3, 4), 5); assert(flatten(vec) ==make_vector(1, 2, 3, 4, 5)));