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ng_misc_opt: improve performance in large cases

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Justin Viiret
2017-05-31 16:11:52 +10:00
committed by Matthew Barr
parent 95e3fd3f32
commit b09e3acd04
2 changed files with 67 additions and 25 deletions
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25
src/util/graph.h
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2015-2016, Intel Corporation
* Copyright (c) 2015-2017, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
@@ -235,6 +235,29 @@ vertex_recorder<Cont> make_vertex_recorder(Cont &o) {
return vertex_recorder<Cont>(o);
}
/**
* \brief A vertex recorder visitor that sets the bits in the given bitset
* type (e.g. boost::dynamic_bitset) corresponding to the indices of the
* vertices encountered.
*/
template<typename Bitset>
class vertex_index_bitset_recorder : public boost::default_dfs_visitor {
public:
explicit vertex_index_bitset_recorder(Bitset &o) : out(o) {}
template<class Graph>
void discover_vertex(typename Graph::vertex_descriptor v, const Graph &g) {
assert(g[v].index < out.size());
out.set(g[v].index);
}
Bitset &out;
};
template<typename Bitset>
vertex_index_bitset_recorder<Bitset>
make_vertex_index_bitset_recorder(Bitset &o) {
return vertex_index_bitset_recorder<Bitset>(o);
}
template <class Graph>
std::pair<typename Graph::edge_descriptor, bool>
add_edge_if_not_present(typename Graph::vertex_descriptor u,