From 19fcec84d8d7d21e796c7624e521b60d28ee21ed Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:45:59 +0200
Subject: Adding upstream version 16.2.11+ds.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/boost/libs/graph/example/bfs-example2.cpp | 119 ++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 src/boost/libs/graph/example/bfs-example2.cpp

(limited to 'src/boost/libs/graph/example/bfs-example2.cpp')

diff --git a/src/boost/libs/graph/example/bfs-example2.cpp b/src/boost/libs/graph/example/bfs-example2.cpp
new file mode 100644
index 000000000..564c70313
--- /dev/null
+++ b/src/boost/libs/graph/example/bfs-example2.cpp
@@ -0,0 +1,119 @@
+//=======================================================================
+// Copyright 2001 Jeremy G. Siek, Andrew Lumsdaine, Lie-Quan Lee,
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//=======================================================================
+#include <boost/graph/adjacency_list.hpp>
+#include <boost/graph/breadth_first_search.hpp>
+#include <boost/pending/indirect_cmp.hpp>
+#include <boost/range/irange.hpp>
+#include <boost/property_map/property_map.hpp>
+
+#include <iostream>
+
+using namespace boost;
+template < typename TimeMap >
+class bfs_time_visitor : public default_bfs_visitor
+{
+    typedef typename property_traits< TimeMap >::value_type T;
+
+public:
+    bfs_time_visitor(TimeMap tmap, T& t) : m_timemap(tmap), m_time(t) {}
+    template < typename Vertex, typename Graph >
+    void discover_vertex(Vertex u, const Graph& g) const
+    {
+        put(m_timemap, u, m_time++);
+    }
+    TimeMap m_timemap;
+    T& m_time;
+};
+
+struct VertexProps
+{
+    boost::default_color_type color;
+    std::size_t discover_time;
+    unsigned int index;
+};
+
+int main()
+{
+    using namespace boost;
+    // Select the graph type we wish to use
+    typedef adjacency_list< listS, listS, undirectedS, VertexProps > graph_t;
+    // Set up the vertex IDs and names
+    enum
+    {
+        r,
+        s,
+        t,
+        u,
+        v,
+        w,
+        x,
+        y,
+        N
+    };
+    const char* name = "rstuvwxy";
+    // Specify the edges in the graph
+    typedef std::pair< int, int > E;
+    E edge_array[] = { E(r, s), E(r, v), E(s, w), E(w, r), E(w, t), E(w, x),
+        E(x, t), E(t, u), E(x, y), E(u, y) };
+    // Create the graph object
+    const int n_edges = sizeof(edge_array) / sizeof(E);
+#if defined(BOOST_MSVC) && BOOST_MSVC <= 1300
+    // VC++ has trouble with the edge iterator constructor
+    graph_t g;
+    std::vector< graph_traits< graph_t >::vertex_descriptor > verts;
+    for (std::size_t i = 0; i < N; ++i)
+        verts.push_back(add_vertex(g));
+    for (std::size_t j = 0; j < n_edges; ++j)
+        add_edge(verts[edge_array[j].first], verts[edge_array[j].second], g);
+#else
+    typedef graph_traits< graph_t >::vertices_size_type v_size_t;
+    graph_t g(edge_array, edge_array + n_edges, v_size_t(N));
+#endif
+
+    // Typedefs
+    typedef graph_traits< graph_t >::vertices_size_type Size;
+
+    Size time = 0;
+    typedef property_map< graph_t, std::size_t VertexProps::* >::type
+        dtime_map_t;
+    dtime_map_t dtime_map = get(&VertexProps::discover_time, g);
+    bfs_time_visitor< dtime_map_t > vis(dtime_map, time);
+    breadth_first_search(
+        g, vertex(s, g), color_map(get(&VertexProps::color, g)).visitor(vis));
+
+    // a vector to hold the discover time property for each vertex
+    std::vector< Size > dtime(num_vertices(g));
+    typedef iterator_property_map< std::vector< Size >::iterator,
+        property_map< graph_t, unsigned int VertexProps::* >::type >
+        dtime_pm_type;
+    graph_traits< graph_t >::vertex_iterator vi, vi_end;
+    std::size_t c = 0;
+    for (boost::tie(vi, vi_end) = vertices(g); vi != vi_end; ++vi, ++c)
+    {
+        dtime[c] = dtime_map[*vi];
+        put(&VertexProps::index, g, *vi, c);
+    }
+    dtime_pm_type dtime_pm(dtime.begin(), get(&VertexProps::index, g));
+
+    // Use std::sort to order the vertices by their discover time
+    std::vector< graph_traits< graph_t >::vertices_size_type > discover_order(
+        N);
+    integer_range< int > range(0, N);
+    std::copy(range.begin(), range.end(), discover_order.begin());
+    std::sort(discover_order.begin(), discover_order.end(),
+        make_indirect_cmp(std::less< Size >(),
+            make_iterator_property_map(
+                dtime.begin(), typed_identity_property_map< std::size_t >())));
+
+    std::cout << "order of discovery: ";
+    for (int i = 0; i < N; ++i)
+        std::cout << name[discover_order[i]] << " ";
+    std::cout << std::endl;
+
+    return EXIT_SUCCESS;
+}
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