private static bool TryGetEndpoints(Graph graph, Endpoints edge, out Endpoints endpoints)
{
bool hasTail = graph.TryGetTail(edge, out int tail);
bool hasHead = graph.TryGetHead(edge, out int head);
endpoints = new Endpoints(tail, head);
return(hasTail && hasHead);
}
private void EnumerateVerticesCore(Graph graph, bool multipleSource)
{
Debug.Assert(graph != null, "graph != null");
// Arrange
byte[] mapBackingStore = ArrayPool <byte> .Shared.Rent(Math.Max(graph.VertexCount, 1));
Array.Clear(mapBackingStore, 0, mapBackingStore.Length);
IndexedColorDictionary eagerColorMap = new(mapBackingStore);
ConcurrentQueue <int> fringe = new();
byte[] setBackingStore = ArrayPool <byte> .Shared.Rent(Math.Max(graph.VertexCount, 1));
Array.Clear(setBackingStore, 0, setBackingStore.Length);
IndexedSet set = new(setBackingStore);
using Rist <int> eagerSteps = new(graph.VertexCount);
using Rist <int> enumerableSteps = new(graph.VertexCount);
BfsHandler <Graph, int, Endpoints> bfsHandler = CreateBfsHandler(eagerSteps);
// Act
if (multipleSource)
{
if (graph.VertexCount < 3)
{
return;
}
int sourceCount = graph.VertexCount / 3;
IndexEnumerator sources = new(sourceCount);
EagerBfs.Traverse(graph, sources, eagerColorMap, bfsHandler);
using IEnumerator <int> vertices = GenericSearch.EnumerateVertices(graph, sources, fringe, set);
enumerableSteps.AddEnumerator(vertices);
}
else
{
int source = graph.VertexCount >> 1;
EagerBfs.Traverse(graph, source, eagerColorMap, bfsHandler);
using IEnumerator <int> vertices = GenericSearch.EnumerateVertices(graph, source, fringe, set);
enumerableSteps.AddEnumerator(vertices);
}
// Assert
int eagerStepCount = eagerSteps.Count;
int enumerableStepCount = enumerableSteps.Count;
Assert.Equal(eagerStepCount, enumerableStepCount);
int count = eagerStepCount;
for (int i = 0; i < count; ++i)
{
int eagerStep = eagerSteps[i];
int enumerableStep = enumerableSteps[i];
if (eagerStep == enumerableStep)
{
continue;
}
Assert.Equal(eagerStep, enumerableStep);
}
// Cleanup
ArrayPool <byte> .Shared.Return(mapBackingStore);
ArrayPool <byte> .Shared.Return(setBackingStore);
}