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+// Copyright 2012 The Kyua Authors.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+//   notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+//   notice, this list of conditions and the following disclaimer in the
+//   documentation and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors
+//   may be used to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/// \file utils/config/exceptions.hpp
+/// Exception types raised by the config module.
+
+#if !defined(UTILS_CONFIG_EXCEPTIONS_HPP)
+#define UTILS_CONFIG_EXCEPTIONS_HPP
+
+#include <stdexcept>
+
+#include "utils/config/keys_fwd.hpp"
+#include "utils/config/tree_fwd.hpp"
+
+namespace utils {
+namespace config {
+
+
+/// Base exceptions for config errors.
+class error : public std::runtime_error {
+public:
+    explicit error(const std::string&);
+    ~error(void) throw();
+};
+
+
+/// Exception denoting that two trees cannot be combined.
+class bad_combination_error : public error {
+public:
+    explicit bad_combination_error(const detail::tree_key&,
+                                   const std::string&);
+    ~bad_combination_error(void) throw();
+};
+
+
+/// Exception denoting that a key was not found within a tree.
+class invalid_key_error : public error {
+public:
+    explicit invalid_key_error(const std::string&);
+    ~invalid_key_error(void) throw();
+};
+
+
+/// Exception denoting that a key was given an invalid value.
+class invalid_key_value : public error {
+public:
+    explicit invalid_key_value(const detail::tree_key&, const std::string&);
+    ~invalid_key_value(void) throw();
+};
+
+
+/// Exception denoting that a configuration file is invalid.
+class syntax_error : public error {
+public:
+    explicit syntax_error(const std::string&);
+    ~syntax_error(void) throw();
+};
+
+
+/// Exception denoting that a key was not found within a tree.
+class unknown_key_error : public error {
+public:
+    explicit unknown_key_error(const detail::tree_key&,
+                               const std::string& = "");
+    ~unknown_key_error(void) throw();
+};
+
+
+/// Exception denoting that a value was invalid.
+class value_error : public error {
+public:
+    explicit value_error(const std::string&);
+    ~value_error(void) throw();
+};
+
+
+}  // namespace config
+}  // namespace utils
+
+
+#endif  // !defined(UTILS_CONFIG_EXCEPTIONS_HPP)