70 lines
2.1 KiB
C++
70 lines
2.1 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 cmph_uint8 kInvalidEdge = std::numeric_limits<cmph_uint8>::max();
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}
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namespace cxxmph {
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TriGraph::TriGraph(cmph_uint32 nvertices, cmph_uint32 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<cmph_uint32>().swap(first_edge_);
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vector<cmph_uint8>().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(cmph_uint32 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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cmph_uint32 vertex = edges_[current_edge][i];
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cmph_uint32 edge1 = first_edge_[vertex];
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cmph_uint32 edge2 = kInvalidEdge;
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cmph_uint32 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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} // namespace cxxmph
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