47 lines
1.8 KiB
C
47 lines
1.8 KiB
C
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#ifndef INCLUDED_C_TRANSITIVECLOSURE_H
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#define INCLUDED_C_TRANSITIVECLOSURE_H
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#ifndef INCLUDED_C_DIGRAPH_H
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#include <c_Digraph.h>
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#endif /*INCLUDED_C_DIGRAPH_H*/
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#ifndef INCLUDED_C_NONRECURSIVEDIRECTEDDFS
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#include <c_NonrecursiveDirectedDFS.h>
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#endif /*INCLUDED_C_NONRECURSIVEDIRECTEDDFS*/
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/* ------------------------------------------------------------------------------------------------------------------ */
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/* */
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typedef struct {
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c_NonrecursiveDirectedDFS_t* dfs_matrix; /* Array of DFS instances (size of graph->V) */
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c_size_t V; /* Stored vertex count for boundary safe checks */
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c_Allocator_t allocator; /* Deep copy of the user-provided allocator */
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} c_TransitiveClosure_t;
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/* ------------------------------------------------------------------------------------------------------------------ */
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/* */
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/**
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* @brief Computes the transitive closure of a digraph to support all-pairs reachability queries.
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* @param allocator Explicit allocator context used to allocate internal search objects
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*/
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c_err_t c_TransitiveClosure_Init(c_TransitiveClosure_t* self, c_Digraph_t* graph, c_Allocator_t* allocator);
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/**
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* @brief Releases internal tracking buffers and all embedded search matrices
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*/
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void c_TransitiveClosure_Destroy(c_TransitiveClosure_t* self);
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/**
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* @brief Is vertex 'v' reachable from vertex 'u'?
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* @return C_TRUE if there is a directed path from 'u' to 'v', C_FALSE otherwise
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*/
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C_STATIC_FORCE_INLINE
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c_bool_t c_TransitiveClosure_Reachable(c_TransitiveClosure_t* self, c_size_t u, c_size_t v) {
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if (!self || !self->dfs_matrix || u >= self->V || v >= self->V) return C_FALSE;
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return c_NonrecursiveDirectedDFS_HasPathTo(&self->dfs_matrix[u], v, self->V);
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}
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#endif /*INCLUDED_C_TRANSITIVECLOSURE_H*/
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