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Returns the first element in the sequence.
template <typename Sequence> typenameresult_of::front<Sequence>::type front(Sequence& seq); template <typename Sequence> typenameresult_of::front<Sequence const>::type front(Sequence const& seq);
| Parameter | Requirement | Description | 
|---|---|---|
| 
                       | Model of Forward Sequence | The sequence we wish to investigate. | 
front(seq);
            Return type: Returns a reference to
            the first element in the sequence seq
            if seq is mutable and
            e =
            o, where e
            is the first element in the sequence, is a valid expression. Else, returns
            a type convertible to the first element in the sequence.
          
            Precondition: empty(seq) == false
Semantics: Returns the first element in the sequence.
#include <boost/fusion/sequence/intrinsic/front.hpp> #include <boost/fusion/include/front.hpp>
vector<int, int, int> v(1, 2, 3);
assert(front(v) == 1);