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breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Co-Work with BGL</span><meta itemprop="position" content="4"></li></ul></nav><div class="theme-doc-markdown markdown"><h1>Co-Work with BGL</h1> |
| <p>The <a href="https://cs.brown.edu/~jwicks/boost/libs/graph/doc/" target="_blank" rel="noopener noreferrer">Boost Graph Library |
| (BGL)</a> is the first |
| C++ library to apply the principles of generic programming to the |
| construction of the advanced data structures and algorithms used in |
| graph computations. The BGL graph interface and graph components are |
| generic in the same sense as the Standard Template Library (STL). And it |
| provides some built-in algorithms which cover a core set of algorithm |
| patterns and a larger set of graph algorithms.</p> |
| <p>We take calculating CC as an example, to demonstrate how BGL works with |
| GraphAr. A weakly connected component is a maximal subgraph of a graph |
| such that for every pair of vertices in it, there is an undirected path |
| connecting them. And the CC algorithm is to identify all such components |
| in a graph. Learn more about <a href="https://en.wikipedia.org/wiki/Connected_component" target="_blank" rel="noopener noreferrer">the CC |
| algorithm</a>.</p> |
| <p>The source code of CC based on BGL can be found at |
| <a href="https://github.com/apache/incubator-graphar/blob/main/cpp/examples/bgl_example.cc" target="_blank" rel="noopener noreferrer">bgl_example.cc</a>. |
| In this program, the graph information file is first read to get the |
| metadata:</p> |
| <div class="language-cpp codeBlockContainer_w3PW theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_Tt2Q"><pre tabindex="0" class="prism-code language-cpp codeBlock_xdHR thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_Sjn8"><span class="token-line" style="color:#393A34"><span class="token plain">std</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">string path </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// the path of the graph information file</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">auto</span><span class="token plain"> graph_info </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> graphar</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token class-name">GraphInfo</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token function" style="color:#d73a49">Load</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">path</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">value</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre><div class="buttonGroup_oM_0"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_CGtL" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_t3v4"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_srdl"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> |
| <p>And then, the vertex collection and the edge collection are established |
| as the handles to access the graph data:</p> |
| <div class="language-cpp codeBlockContainer_w3PW theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_Tt2Q"><pre tabindex="0" class="prism-code language-cpp codeBlock_xdHR thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_Sjn8"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">auto</span><span class="token plain"> maybe_vertices </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> graphar</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token class-name">VerticesCollection</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token function" style="color:#d73a49">Make</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">graph_info</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"person"</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">auto</span><span class="token plain"> vertices </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> maybe_vertices</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">value</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">auto</span><span class="token plain"> maybe_edges </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> graphar</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token class-name">EdgesCollection</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token function" style="color:#d73a49">Make</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">graph_info</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"person"</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"knows"</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"person"</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> graphar</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">AdjListType</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">ordered_by_source</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">auto</span><span class="token plain"> edges </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> maybe_edges</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">value</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre><div class="buttonGroup_oM_0"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_CGtL" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_t3v4"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_srdl"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> |
| <p>Next, we construct the in-memory graph data structure for BGL by |
| traversing the vertices and edges via GraphAr's high-level reading |
| interface (the vertex iterator and the edge iterator):</p> |
| <div class="language-cpp codeBlockContainer_w3PW theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_Tt2Q"><pre tabindex="0" class="prism-code language-cpp codeBlock_xdHR thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_Sjn8"><span class="token-line" style="color:#393A34"><span class="token comment" style="color:#999988;font-style:italic">// define the Graph type in BGL</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">typedef</span><span class="token plain"> boost</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">adjacency_list</span><span class="token operator" style="color:#393A34"><</span><span class="token plain">boost</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">vecS</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// use vector to store edges</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> boost</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">vecS</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// use vector to store vertices</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> boost</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">undirectedS</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// undirected</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> boost</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">property</span><span class="token operator" style="color:#393A34"><</span><span class="token plain">boost</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">vertex_name_t</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">int64_t</span><span class="token operator" style="color:#393A34">></span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// vertex property</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> boost</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">no_property</span><span class="token operator" style="color:#393A34">></span><span class="token plain"> Graph</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// no edge property</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">// descriptors for vertex in BGL</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">typedef</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">typename</span><span class="token plain"> </span><span class="token class-name">boost</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">graph_traits</span><span class="token operator" style="color:#393A34"><</span><span class="token plain">Graph</span><span class="token operator" style="color:#393A34">></span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">vertex_descriptor Vertex</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">// declare a graph object with (num_vertices) vertices and an edge iterator</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">std</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">vector</span><span class="token operator" style="color:#393A34"><</span><span class="token plain">std</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">pair</span><span class="token operator" style="color:#393A34"><</span><span class="token plain">graphar</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">IdType</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> graphar</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">IdType</span><span class="token operator" style="color:#393A34">>></span><span class="token plain"> edges_array</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">auto</span><span class="token plain"> it_begin </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> edges</span><span class="token operator" style="color:#393A34">-></span><span class="token function" style="color:#d73a49">begin</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> it_end </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> edges</span><span class="token operator" style="color:#393A34">-></span><span class="token function" style="color:#d73a49">end</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">for</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">auto</span><span class="token plain"> it </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> it_begin</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"> it </span><span class="token operator" style="color:#393A34">!=</span><span class="token plain"> it_end</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">++</span><span class="token plain">it</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> edges_array</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">push_back</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">std</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token function" style="color:#d73a49">make_pair</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">it</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">source</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> it</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">destination</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">Graph </span><span class="token function" style="color:#d73a49">g</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">edges_array</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">begin</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> edges_array</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">end</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> num_vertices</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">// define the internal vertex property "id"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">boost</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">property_map</span><span class="token operator" style="color:#393A34"><</span><span class="token plain">Graph</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> boost</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">vertex_name_t</span><span class="token operator" style="color:#393A34">></span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">type id </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">get</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">boost</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token function" style="color:#d73a49">vertex_name_t</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> g</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">auto</span><span class="token plain"> v_it_begin </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> vertices</span><span class="token operator" style="color:#393A34">-></span><span class="token function" style="color:#d73a49">begin</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> v_it_end </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> vertices</span><span class="token operator" style="color:#393A34">-></span><span class="token function" style="color:#d73a49">end</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">for</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">auto</span><span class="token plain"> it </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> v_it_begin</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"> it </span><span class="token operator" style="color:#393A34">!=</span><span class="token plain"> v_it_end</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">++</span><span class="token plain">it</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword" style="color:#00009f">auto</span><span class="token plain"> vertex </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">*</span><span class="token plain">it</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> boost</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token function" style="color:#d73a49">put</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">id</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> vertex</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">id</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> vertex</span><span class="token punctuation" style="color:#393A34">.</span><span class="token generic-function function" style="color:#d73a49">property</span><span class="token generic-function generic class-name operator" style="color:#393A34"><</span><span class="token generic-function generic class-name keyword" style="color:#00009f">int64_t</span><span class="token generic-function generic class-name operator" style="color:#393A34">></span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">"id"</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">value</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><br></span></code></pre><div class="buttonGroup_oM_0"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_CGtL" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_t3v4"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_srdl"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> |
| <p>After that, an internal CC algorithm provided by BGL is called:</p> |
| <div class="language-cpp codeBlockContainer_w3PW theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_Tt2Q"><pre tabindex="0" class="prism-code language-cpp codeBlock_xdHR thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_Sjn8"><span class="token-line" style="color:#393A34"><span class="token comment" style="color:#999988;font-style:italic">// define the external vertex property "component"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">std</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">vector</span><span class="token operator" style="color:#393A34"><</span><span class="token keyword" style="color:#00009f">int</span><span class="token operator" style="color:#393A34">></span><span class="token plain"> </span><span class="token function" style="color:#d73a49">component</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">num_vertices</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">// call algorithm: cc</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">int</span><span class="token plain"> cc_num </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> boost</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token function" style="color:#d73a49">connected_components</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">g</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">&</span><span class="token plain">component</span><span class="token punctuation" style="color:#393A34">[</span><span class="token number" style="color:#36acaa">0</span><span class="token punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">std</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">cout </span><span class="token operator" style="color:#393A34"><<</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"Total number of components: "</span><span class="token plain"> </span><span class="token operator" style="color:#393A34"><<</span><span class="token plain"> cc_num </span><span class="token operator" style="color:#393A34"><<</span><span class="token plain"> std</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">endl</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre><div class="buttonGroup_oM_0"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_CGtL" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_t3v4"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_srdl"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> |
| <p>Finally, we could use a <strong>VerticesBuilder</strong> of GraphAr to write the |
| results to new generated GraphAr format data:</p> |
| <div class="language-cpp codeBlockContainer_w3PW theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_Tt2Q"><pre tabindex="0" class="prism-code language-cpp codeBlock_xdHR thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_Sjn8"><span class="token-line" style="color:#393A34"><span class="token comment" style="color:#999988;font-style:italic">// construct a new property group</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">graphar</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">Property cc </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token string" style="color:#e3116c">"cc"</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> graphar</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token function" style="color:#d73a49">int32</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token boolean" style="color:#36acaa">false</span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">std</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">vector</span><span class="token operator" style="color:#393A34"><</span><span class="token plain">graphar</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">Property</span><span class="token operator" style="color:#393A34">></span><span class="token plain"> property_vector </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain">cc</span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">auto</span><span class="token plain"> group </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> graphar</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token function" style="color:#d73a49">CreatePropertyGroup</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">property_vector</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> graphar</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">FileType</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">PARQUET</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">// construct the new vertex info</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">std</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">string vertex_type </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"cc_result"</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> vertex_prefix </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"result/"</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">int</span><span class="token plain"> chunk_size </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">100</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">auto</span><span class="token plain"> new_info </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> graphar</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token function" style="color:#d73a49">CreateVertexInfo</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">vertex_type</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> chunk_size</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain">group</span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> vertex_prefix</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">// access the vertices via the index map and vertex iterator of BGL</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">typedef</span><span class="token plain"> boost</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">property_map</span><span class="token operator" style="color:#393A34"><</span><span class="token plain">Graph</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> boost</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">vertex_index_t</span><span class="token operator" style="color:#393A34">></span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">type IndexMap</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">IndexMap index </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> boost</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token function" style="color:#d73a49">get</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">boost</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">vertex_index</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> g</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">typedef</span><span class="token plain"> boost</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">graph_traits</span><span class="token operator" style="color:#393A34"><</span><span class="token plain">Graph</span><span class="token operator" style="color:#393A34">></span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">vertex_iterator vertex_iter</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">std</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">pair</span><span class="token operator" style="color:#393A34"><</span><span class="token plain">vertex_iter</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> vertex_iter</span><span class="token operator" style="color:#393A34">></span><span class="token plain"> vp</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">// dump the results through the VerticesBuilder</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">graphar</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">builder</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">VerticesBuilder </span><span class="token function" style="color:#d73a49">builder</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">new_info</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"/tmp/"</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">for</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">vp </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> boost</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token function" style="color:#d73a49">vertices</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">g</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"> vp</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">first</span><span class="token operator" style="color:#393A34">!=</span><span class="token plain"> vp</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">second</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">++</span><span class="token plain">vp</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">first</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> Vertex v </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">*</span><span class="token plain">vp</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">first</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> graphar</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">builder</span><span class="token double-colon punctuation" style="color:#393A34">::</span><span class="token plain">Vertex </span><span class="token function" style="color:#d73a49">vertex</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">index</span><span class="token punctuation" style="color:#393A34">[</span><span class="token plain">v</span><span class="token punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> vertex</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">AddProperty</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">cc</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">name</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> component</span><span class="token punctuation" style="color:#393A34">[</span><span class="token plain">index</span><span class="token punctuation" style="color:#393A34">[</span><span class="token plain">v</span><span class="token punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> builder</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">AddVertex</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">vertex</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">builder</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">Dump</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre><div class="buttonGroup_oM_0"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_CGtL" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_t3v4"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_srdl"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/apache/incubator-graphar/edit/main/docs/libraries/cpp/examples/bgl.md" target="_blank" rel="noopener noreferrer" 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