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Moves an iterator 1 position backwards.
template<
    typename I
    >
typename result_of::prior<I>::type prior(I const& i);
Table 1.3. Parameters
| Parameter | Requirement | Description | 
|---|---|---|
| 
                     | Model of Bidirectional Iterator | Operation's argument | 
prior(i);
          Return type: A model of the same iterator
          concept as i.
        
          Semantics: Returns an iterator to the
          element prior to i.
        
#include <boost/fusion/iterator/prior.hpp> #include <boost/fusion/include/prior.hpp>
typedefvector<int,int> vec; vec v(1,2); assert(deref(next(begin(v))) == 2); assert(deref(prior(next(begin(v)))) == 1);