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64 lines
2.0 KiB
64 lines
2.0 KiB
1 year ago
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#ifndef IGL_BFS_H
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#define IGL_BFS_H
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#include "igl_inline.h"
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#include <Eigen/Core>
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#include <vector>
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#include <Eigen/Sparse>
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namespace igl
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{
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/// Traverse a **directed** graph represented by an adjacency list using.
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/// breadth first search; outputs Eigen types.
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///
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/// @param[in] A #V list of adjacency lists or #V by #V adjacency matrix
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/// @param[in] s starting node (index into A)
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/// @param[out] D #V list of indices into rows of A in the order in which graph nodes
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/// are discovered.
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/// @param[out] P #V list of indices into rows of A of predecessor in resulting
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/// spanning tree {-1 indicates root/not discovered), order corresponds to
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/// V **not** D.
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template <
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typename AType,
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typename DerivedD,
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typename DerivedP>
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IGL_INLINE void bfs(
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const AType & A,
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const size_t s,
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Eigen::PlainObjectBase<DerivedD> & D,
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Eigen::PlainObjectBase<DerivedP> & P);
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/// Traverse a **directed** graph represented by an adjacency list using.
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/// breadth first search; inputs adjacency lists, outputs lists.
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///
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/// @param[in] A #V list of adjacency lists
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/// @param[in] s starting node (index into A)
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/// @param[out] D #V list of indices into rows of A in the order in which graph nodes
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/// are discovered.
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/// @param[out] P #V list of indices into rows of A of predecessor in resulting
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/// spanning tree {-1 indicates root/not discovered), order corresponds to
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/// V **not** D.
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template <
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typename AType,
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typename DType,
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typename PType>
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IGL_INLINE void bfs(
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const std::vector<std::vector<AType> > & A,
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const size_t s,
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std::vector<DType> & D,
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std::vector<PType> & P);
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/// \overload
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template <
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typename AType,
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typename DType,
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typename PType>
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IGL_INLINE void bfs(
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const Eigen::SparseCompressedBase<AType> & A,
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const size_t s,
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std::vector<DType> & D,
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std::vector<PType> & P);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "bfs.cpp"
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#endif
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#endif
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