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        filter_view is a view into
        a subset of its underlying sequence's elements satisfying a given predicate
        (an MPL metafunction).
        The filter_view presents
        only those elements for which its predicate evaluates to mpl::true_.
      
#include <boost/fusion/view/filter_view.hpp> #include <boost/fusion/include/filter_view.hpp>
template <typename Sequence, typename Pred> struct filter_view;
| Parameter | Description | Default | 
|---|---|---|
| 
                   | ||
| 
                   | 
                  Unary Metafunction returning an  | 
Sequence
            implements the Associative
            Sequence model.
          Notation
F
              A filter_view type
            
f, f2
              Instances of filter_view
            
sSemantics of an expression is defined only where it differs from, or is not defined in the implemented models.
| Expression | Semantics | 
|---|---|
| 
                   | 
                  Creates a  | 
| 
                   | 
                  Copy constructs a  | 
| 
                   | 
                  Assigns to a  | 
using boost::mpl::_;
using boost::mpl::not_;
using boost::is_class;
typedef vector<std::string, char, long, bool, double> vector_type;
vector_type v("a-string", '@', 987654, true, 6.6);
filter_view<vector_type const, not_<is_class<_> > > view(v);
std::cout << view << std::endl;