82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
#include <cassert>
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#include <limits>
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#include <iostream>
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#include "trigraph.h"
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using std::cerr;
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using std::endl;
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using std::vector;
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namespace {
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static const uint32_t kInvalidEdge = std::numeric_limits<uint32_t>::max();
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}
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namespace cxxmph {
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TriGraph::TriGraph(uint32_t nvertices, uint32_t nedges)
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: nedges_(0),
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edges_(nedges),
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next_edge_(nedges),
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first_edge_(nvertices, kInvalidEdge),
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vertex_degree_(nvertices, 0) { }
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void TriGraph::ExtractEdgesAndClear(vector<Edge>* edges) {
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vector<Edge>().swap(next_edge_);
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vector<uint32_t>().swap(first_edge_);
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vector<uint8_t>().swap(vertex_degree_);
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nedges_ = 0;
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edges->swap(edges_);
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}
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void TriGraph::AddEdge(const Edge& edge) {
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edges_[nedges_] = edge;
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assert(first_edge_.size() > edge[0]);
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assert(first_edge_.size() > edge[1]);
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assert(first_edge_.size() > edge[0]);
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assert(first_edge_.size() > edge[1]);
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assert(first_edge_.size() > edge[2]);
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assert(next_edge_.size() > nedges_);
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next_edge_[nedges_] = Edge(
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first_edge_[edge[0]], first_edge_[edge[1]], first_edge_[edge[2]]);
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first_edge_[edge[0]] = first_edge_[edge[1]] = first_edge_[edge[2]] = nedges_;
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++vertex_degree_[edge[0]];
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++vertex_degree_[edge[1]];
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++vertex_degree_[edge[2]];
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++nedges_;
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}
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void TriGraph::RemoveEdge(uint32_t current_edge) {
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// cerr << "Removing edge " << current_edge << " from " << nedges_ << " existing edges " << endl;
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for (int i = 0; i < 3; ++i) {
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uint32_t vertex = edges_[current_edge][i];
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uint32_t edge1 = first_edge_[vertex];
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uint32_t edge2 = kInvalidEdge;
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uint32_t j = 0;
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while (edge1 != current_edge && edge1 != kInvalidEdge) {
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edge2 = edge1;
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if (edges_[edge1][0] == vertex) j = 0;
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else if (edges_[edge1][1] == vertex) j = 1;
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else j = 2;
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edge1 = next_edge_[edge1][j];
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}
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assert(edge1 != kInvalidEdge);
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if (edge2 != kInvalidEdge) next_edge_[edge2][j] = next_edge_[edge1][i];
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else first_edge_[vertex] = next_edge_[edge1][i];
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--vertex_degree_[vertex];
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}
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}
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void TriGraph::DebugGraph() const {
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int i;
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for(i = 0; i < edges_.size(); i++){
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cerr << i << " " << edges_[i][0] << " " << edges_[i][1] << " " << edges_[i][2]
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<< " nexts " << next_edge_[i][0] << " " << next_edge_[i][1] << " " << next_edge_[i][2] << endl;
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}
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for(i = 0; i < first_edge_.size();i++){
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cerr << "first for vertice " <<i << " " << first_edge_[i] << endl;
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}
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}
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} // namespace cxxmph
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