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            Returns a type convertible to int
            that evaluates the number of elements in the sequence.
          
template <typename Sequence>
typename result_of::size<Sequence>::type
size(Sequence const& seq);
| Parameter | Requirement | Description | 
|---|---|---|
| 
                       | Model of Forward Sequence | The sequence we wish to investigate. | 
size(seq);
            Return type: Convertible to int.
          
Semantics: Returns the number of elements in the sequence.
#include <boost/fusion/sequence/intrinsic/size.hpp> #include <boost/fusion/include/size.hpp>
vector<int, int, int> v(1, 2, 3);
assert(size(v) == 3);