56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
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#ifndef INCLUDED_C_DIRECTEDDFS_H
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#define INCLUDED_C_DIRECTEDDFS_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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/* ------------------------------------------------------------------------------------------------------------------ */
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/* */
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typedef struct {
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c_bool_t* marked; /* Visited tracking array (size of graph->V) */
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c_size_t count; /* Total number of vertices reachable from source(s) */
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c_Allocator_t allocator;
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}c_DirectedDFS_t;
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/* ------------------------------------------------------------------------------------------------------------------ */
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/* */
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/**
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* @brief Computes vertices reachable from a single source vertex 's'
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*/
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c_err_t c_DirectedDFS_Init(c_DirectedDFS_t* self, const c_Digraph_t* graph, c_size_t s, c_Allocator_t* allocator);
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/**
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* @brief Computes vertices reachable from a list of multiple source vertices
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*/
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c_err_t c_DirectedDFS_InitMulti(c_DirectedDFS_t* self, const c_Digraph_t* graph, const c_size_t* sources, c_size_t source_count, c_Allocator_t* allocator);
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/**
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* @brief Releases internal tracking buffers
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*/
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void c_DirectedDFS_Destroy(c_DirectedDFS_t* self);
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/* ================================================================================================================== */
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/* Inline Query Interfaces */
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/**
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* @brief Is there a directed path from the source(s) to vertex 'v'?
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*/
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C_STATIC_FORCE_INLINE
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c_bool_t c_DirectedDFS_HasPathTo(const c_DirectedDFS_t* self, c_size_t v, c_size_t total_V) {
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if (!self || !self->marked || v >= total_V) return C_FALSE;
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return self->marked[v];
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}
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/**
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* @brief Returns the total count of reachable vertices
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*/
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C_STATIC_FORCE_INLINE
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c_size_t c_DirectedDFS_GetCount(const c_DirectedDFS_t* self) {
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return self ? self->count : 0;
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}
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#endif /*INCLUDED_C_DIRECTEDDFS_H*/
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