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            clear returns an empty sequence.
          
template<
    typename Sequence
    >
typename result_of::clear<Sequence const>::type clear(Sequence const& seq);
Table 1.75. Parameters
| Parameter | Requirement | Description | 
|---|---|---|
| 
                       | A model of Forward Sequence | Operation's argument | 
clear(seq);
Return type: A model of Forward Sequence.
Expression Semantics: Returns a sequence with no elements.
Constant.
#include <boost/fusion/algorithm/transformation/clear.hpp> #include <boost/fusion/include/clear.hpp>
assert(clear(make_vector(1,2,3)) ==make_vector());