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Add for_each_predecessor() to grapht #6160

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Merged
merged 2 commits into from
May 31, 2021
Merged

Add for_each_predecessor() to grapht #6160

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ba0420c
Add for_each_predecessor() to grapht
johnfxgalea May 30, 2021
538070c
Add tests for for_each_predecessor() and for_each_successor()
johnfxgalea May 30, 2021
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14 changes: 14 additions & 0 deletions src/util/graph.h
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Original file line number Diff line number Diff line change
Expand Up @@ -315,6 +315,9 @@ class grapht
std::vector<node_indext> get_predecessors(const node_indext &n) const;
std::vector<node_indext> get_successors(const node_indext &n) const;
void output_dot(std::ostream &out) const;
void for_each_predecessor(
const node_indext &n,
std::function<void(const node_indext &)> f) const;
void for_each_successor(
const node_indext &n,
std::function<void(const node_indext &)> f) const;
Expand Down Expand Up @@ -961,6 +964,17 @@ grapht<N>::get_successors(const node_indext &n) const
return result;
}

template <class N>
void grapht<N>::for_each_predecessor(
const node_indext &n,
std::function<void(const node_indext &)> f) const
{
std::for_each(
nodes[n].in.begin(),
nodes[n].in.end(),
[&](const std::pair<node_indext, edget> &edge) { f(edge.first); });
}

template <class N>
void grapht<N>::for_each_successor(
const node_indext &n,
Expand Down
11 changes: 11 additions & 0 deletions unit/util/graph.cpp
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Expand Up @@ -329,6 +329,17 @@ SCENARIO("predecessors-successors-graph", "[core][util][graph]")
REQUIRE(graph.get_successors(indices[0]).size() == 1);
REQUIRE(graph.get_predecessors(indices[1]).size() == 1);
REQUIRE(graph.get_successors(indices[1]).size() == 0);

int count = 0;
graph.for_each_predecessor(
indices[1], [&](const simple_grapht::node_indext &n) { count++; });
REQUIRE(count == 1);

// Refresh counter.
count = 0;
graph.for_each_successor(
indices[1], [&](const simple_grapht::node_indext &n) { count++; });
REQUIRE(count == 0);
}
}
}