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For a given sequence, filter_if returns a new sequences containing only the elements with types for which a given MPL Lambda Expression evaluates to boost::mpl::true_.

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template<
    typename Pred,
    typename Sequence
    >
typename result_of::filter_if<Sequence const, Pred>::type filter_if(Sequence const& seq);

Expression =======

Expression >>>>>>> .merge-right.r57125 Semantics

filter_if<Pred>(seq);

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Semantics: Returns a sequence containing all the elements of seq with types for which Pred evaluates to boost::mpl::true_. The order of the retained elements is the same as in the original sequence.

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Constant. Returns a view which is lazily evaluated.

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#include <boost/fusion/algorithm/transformation/filter_if.hpp>
#include <boost/fusion/include/filter_if.hpp>

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const vector<int,int,double,double> vec(1,2,3.0,4.0);
assert(filter_if<is_integral<mpl::_> >(vec) == make_vector(1,2));