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#ifndef _REACHABILITY_H_
#define _REACHABILITY_H_
#include "boost/multi_array.hpp"
// determines minimum and maximum lengths of outgoing edges from all
// coverage positions such that the alignment path respects src and
// trg maximum phrase sizes
//
// runs in O(n^2 * src_max * trg_max) time but should be relatively fast
//
// currently forbids 0 -> n and n -> 0 alignments
struct Reachability {
boost::multi_array<bool, 4> edges; // edges[src_covered][trg_covered][src_delta][trg_delta] is this edge worth exploring?
boost::multi_array<short, 2> max_src_delta; // msd[src_covered][trg_covered] -- the largest src delta that's valid
boost::multi_array<std::vector<std::pair<short,short> >, 2> valid_deltas; // valid_deltas[src_covered][trg_covered] list of valid transitions leaving a particular node
Reachability(int srclen, int trglen, int src_max_phrase_len, int trg_max_phrase_len) :
edges(boost::extents[srclen][trglen][src_max_phrase_len+1][trg_max_phrase_len+1]),
max_src_delta(boost::extents[srclen][trglen]),
valid_deltas(boost::extents[srclen][trglen]) {
ComputeReachability(srclen, trglen, src_max_phrase_len, trg_max_phrase_len);
}
private:
void ComputeReachability(int srclen, int trglen, int src_max_phrase_len, int trg_max_phrase_len);
};
#endif
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