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Returns an iterator pointing to the first element in the sequence.
template <typename Sequence> typenameresult_of::begin<Sequence>::type begin(Sequence& seq); template <typename Sequence> typenameresult_of::begin<Sequence const>::type begin(Sequence const& seq);
| Parameter | Requirement | Description | 
|---|---|---|
| 
                       | Model of Forward Sequence | The sequence we wish to get an iterator from. | 
begin(seq);
Return type:
seq
                is a Forward
                Sequence else, Bidirectional
                Iterator if seq
                is a Bidirectional
                Sequence else, Random
                Access Iterator if seq
                is a Random
                Access Sequence.
              seq
                is an Associative
                Sequence.
              Semantics: Returns an iterator pointing to the first element in the sequence.
#include <boost/fusion/sequence/intrinsic/begin.hpp> #include <boost/fusion/include/begin.hpp>
vector<int, int, int> v(1, 2, 3); assert(deref(begin(v)) == 1);