Added boost header

test/external/boost/graph/exception.hpp

@@ -0,0 +1,55 @@
+//=======================================================================
+// Copyright 2002 Indiana University.
+// Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek
+//
+// 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)
+//=======================================================================
+
+#ifndef BOOST_GRAPH_EXCEPTION_HPP
+#define BOOST_GRAPH_EXCEPTION_HPP
+
+#include <stdexcept>
+#include <string>
+
+namespace boost {
+
+    struct bad_graph : public std::invalid_argument {
+        bad_graph(const std::string& what_arg)
+            : std::invalid_argument(what_arg) { }
+    };
+
+    struct not_a_dag : public bad_graph {
+        not_a_dag()
+            : bad_graph("The graph must be a DAG.")
+        { }
+    };
+
+    struct negative_edge : public bad_graph {
+        negative_edge()
+            : bad_graph("The graph may not contain an edge with negative weight.")
+        { }
+    };
+
+    struct negative_cycle : public bad_graph {
+        negative_cycle()
+            : bad_graph("The graph may not contain negative cycles.")
+        { }
+    };
+
+    struct not_connected : public bad_graph {
+        not_connected()
+            : bad_graph("The graph must be connected.")
+        { }
+    };
+
+   struct not_complete : public bad_graph {
+       not_complete()
+           : bad_graph("The graph must be complete.")
+       { }
+   };
+
+} // namespace boost
+
+#endif // BOOST_GRAPH_EXCEPTION_HPP