83 std::size_t src = 0; // start of path  variable
111     g_distance[src] = 0.0; // src's distance from src is zero  in shortpath()
112     f_distance[src] =  in shortpath()
113         get_distance(vertices[src], vertices[dst]); // estimate distance from src to dst  in shortpath()
114     open_set.emplace(src, f_distance[src]); // emplace src into open_set  in shortpath()
168 void make_path(vertex_id src, vertex_id dst, std::vector<vertex_id>& path) {  in make_path()  argument
171         path.push_back(src);  in make_path()
172     else if (at == src) {  in make_path()
173         path.push_back(src);  in make_path()
177         make_path(src, at, path);  in make_path()
185     make_path(src, dst, path);  in print_path()
286             .arg(src, "start", "      start of path")  in main()
294                (int)src,  in main()
323                        (int)src,  in main()
331                        (int)src,  in main()