utils.h

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#ifndef PCL_GRAPH_UTILS_H
#define PCL_GRAPH_UTILS_H
 
#include <boost/mpl/has_xxx.hpp>
 
namespace pcl::graph::detail
{
    // Create a meta-function that checks if a type has "graph_type" member
    // typedef. This will be used to distinguish between boost::subgraph (does
    // have), and normal graph types (do not have).
    BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(has_root_graph, graph_type, false)
} // namespace pcl::graph::detail
 
namespace pcl::graph
{
    /** remove_edge_if structure is an "extended" version of,
      * boost::remove_edge_if that incorporates a workaround to allow edge
      * removal from both plain graphs and subgraphs.
      *
      * Plain graphs should be passed to boost::remove_edge_if as is, whereas
      * member field `m_graph` should be used in place of the subgraphs
      * (otherwise expect segfaults). */
    template <typename Graph, typename Enable = void>
    struct remove_edge_if
    {
        template <typename Predicate>
        void
        operator()(const Predicate& predicate, Graph& graph) const
        {
            boost::remove_edge_if(predicate, graph);
        }
    };
 
    template <typename Graph>
    struct remove_edge_if<Graph, typename boost::enable_if<detail::has_root_graph<Graph>>::type>
    {
        template <typename Predicate>
        void
        operator()(const Predicate& predicate, Graph& graph) const
        {
            boost::remove_edge_if(predicate, graph.m_graph);
        }
    };
 
} // namespace pcl::graph
 
 
#endif /* PCL_GRAPH_UTILS_H */