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            A metafunction returning the result type of applying copy, which is always void.
          
template <typename Seq1, typename Seq2> struct copy { typedef void type; };
Table 1.38. Parameters
| Parameter | Requirement | Description | 
|---|---|---|
| 
                       | A model of Forward Sequence | Operation's argument | 
| 
                       | A model of Forward Sequence | Operation's argument | 
result_of::copy<Seq1, Seq2>::type
            Return type: void
            iff both of Seq1 and
            Seq2 are sequence. Otherwise,
            none.
          
            Semantics: Returns the return type of
            copy for 2 sequences of types
            Seq1 and Seq2.
          
Constant.
#include <boost/fusion/algorithm/auxiliary/copy.hpp> #include <boost/fusion/include/copy.hpp>