Copy upstream sources to downstream

downstream/libs/graph/include/boost/graph/exception.hpp

@@ -0,0 +1,56 @@
+//=======================================================================
+// 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 BOOST_SYMBOL_VISIBLE bad_graph : public std::invalid_argument
+{
+    bad_graph(const std::string& what_arg) : std::invalid_argument(what_arg) {}
+};
+
+struct BOOST_SYMBOL_VISIBLE not_a_dag : public bad_graph
+{
+    not_a_dag() : bad_graph("The graph must be a DAG.") {}
+};
+
+struct BOOST_SYMBOL_VISIBLE negative_edge : public bad_graph
+{
+    negative_edge()
+    : bad_graph("The graph may not contain an edge with negative weight.")
+    {
+    }
+};
+
+struct BOOST_SYMBOL_VISIBLE negative_cycle : public bad_graph
+{
+    negative_cycle() : bad_graph("The graph may not contain negative cycles.")
+    {
+    }
+};
+
+struct BOOST_SYMBOL_VISIBLE not_connected : public bad_graph
+{
+    not_connected() : bad_graph("The graph must be connected.") {}
+};
+
+struct BOOST_SYMBOL_VISIBLE not_complete : public bad_graph
+{
+    not_complete() : bad_graph("The graph must be complete.") {}
+};
+
+} // namespace boost
+
+#endif // BOOST_GRAPH_EXCEPTION_HPP