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            Returns the result type of fold.
          
template< typename Sequence, typename State, typename F> struct fold { typedef unspecified type; };
Table 1.46. Parameters
| Parameter | Requirement | Description | 
|---|---|---|
| 
                       | A model of Forward Sequence | The sequence to iterate | 
| 
                       | Any type | 
                      The initial state for the first application of  | 
| 
                       | 
                       | The operation to be applied on traversal | 
fold<Sequence, State, F>::type
Return type: Any type
            Semantics: Returns the result of applying
            fold to a sequence of type
            Sequence, with an initial
            state of type State and
            binary function object or function pointer of type F.
          
            Linear, exactly result_of::size<Sequence>::valueF.
          
#include <boost/fusion/algorithm/iteration/fold.hpp> #include <boost/fusion/include/fold.hpp>