From 483eb2f56657e8e7f419ab1a4fab8dce9ade8609 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 27 Apr 2024 20:24:20 +0200
Subject: Adding upstream version 14.2.21.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/boost/libs/graph/example/cycle-file-dep.cpp | 93 +++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 src/boost/libs/graph/example/cycle-file-dep.cpp

(limited to 'src/boost/libs/graph/example/cycle-file-dep.cpp')

diff --git a/src/boost/libs/graph/example/cycle-file-dep.cpp b/src/boost/libs/graph/example/cycle-file-dep.cpp
new file mode 100644
index 00000000..4e172243
--- /dev/null
+++ b/src/boost/libs/graph/example/cycle-file-dep.cpp
@@ -0,0 +1,93 @@
+//=======================================================================
+// 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/config.hpp>
+#include <fstream>
+#include <iostream>
+#include <string>
+#include <boost/graph/adjacency_list.hpp>
+#include <boost/graph/graph_utility.hpp>
+
+using namespace boost;
+
+namespace std
+{
+  template < typename T >
+    std::istream & operator >> (std::istream & in, std::pair < T, T > &p)
+  {
+    in >> p.first >> p.second;
+    return in;
+  }
+}
+
+typedef adjacency_list < listS, // Store out-edges of each vertex in a std::list
+  vecS,                         // Store vertex set in a std::vector
+  directedS                     // The file dependency graph is directed
+> file_dep_graph;
+
+typedef graph_traits < file_dep_graph >::vertex_descriptor vertex_t;
+typedef graph_traits < file_dep_graph >::edge_descriptor edge_t;
+
+bool
+has_cycle_dfs(const file_dep_graph & g, vertex_t u,
+              default_color_type * color)
+{
+  color[u] = gray_color;
+  graph_traits < file_dep_graph >::adjacency_iterator vi, vi_end;
+  for (boost::tie(vi, vi_end) = adjacent_vertices(u, g); vi != vi_end; ++vi)
+    if (color[*vi] == white_color) {
+      if (has_cycle_dfs(g, *vi, color))
+        return true;            // cycle detected, return immediately
+    } else if (color[*vi] == gray_color)        // *vi is an ancestor!
+      return true;
+  color[u] = black_color;
+  return false;
+}
+
+bool
+has_cycle(const file_dep_graph & g)
+{
+  std::vector < default_color_type > color(num_vertices(g), white_color);
+  graph_traits < file_dep_graph >::vertex_iterator vi, vi_end;
+  for (boost::tie(vi, vi_end) = vertices(g); vi != vi_end; ++vi)
+    if (color[*vi] == white_color)
+      if (has_cycle_dfs(g, *vi, &color[0]))
+        return true;
+  return false;
+}
+
+
+int
+main(int argc, const char** argv)
+{
+  std::ifstream file_in(argc >= 2 ? argv[1] : "makefile-dependencies.dat");
+  typedef graph_traits < file_dep_graph >::vertices_size_type size_type;
+  size_type n_vertices;
+  file_in >> n_vertices;        // read in number of vertices
+  std::istream_iterator < std::pair < size_type,
+    size_type > > input_begin(file_in), input_end;
+#if defined(BOOST_MSVC) && BOOST_MSVC <= 1300
+  // VC++ has trouble with the edge iterator constructor
+  file_dep_graph g(n_vertices);
+  while (input_begin != input_end) {
+    size_type i, j;
+    boost::tie(i, j) = *input_begin++;
+    add_edge(i, j, g);
+  }
+#else
+  file_dep_graph g(input_begin, input_end, n_vertices);
+#endif
+
+  std::vector < std::string > name(num_vertices(g));
+  std::ifstream name_in(argc >= 3 ? argv[2] : "makefile-target-names.dat");
+  graph_traits < file_dep_graph >::vertex_iterator vi, vi_end;
+  for (boost::tie(vi, vi_end) = vertices(g); vi != vi_end; ++vi)
+    name_in >> name[*vi];
+
+  assert(has_cycle(g) == false);
+  return 0;
+}
-- 
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