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diff --git a/libtest/exception.hpp b/libtest/exception.hpp
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+/*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
+ *
+ *  Data Differential YATL (i.e. libtest)  library
+ *
+ *  Copyright (C) 2012-2013 Data Differential, http://datadifferential.com/
+ *
+ *  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.
+ *
+ *      * The names of its contributors may not 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.
+ *
+ */
+
+#pragma once
+
+namespace libtest {
+
+class exception : public std::exception
+{
+public:
+  exception(const char *file, int line, const char *func);
+
+  exception( const exception& );
+
+  virtual ~exception() throw();
+
+  virtual const char* what() const throw()
+  {
+    if (_error_message)
+    {
+      return _error_message;
+    }
+
+    return "";
+  }
+
+  void what(size_t, const char*);
+
+  size_t length() const
+  {
+    return _error_message_size;
+  }
+
+  int line() const
+  {
+    return _line;
+  }
+
+  const char* file() const
+  {
+    return _file;
+  }
+
+  const char* func() const
+  {
+    return _func;
+  }
+
+protected:
+  void init(va_list);
+
+private:
+  int _line;
+  const char*  _file;
+  const char* _func;
+  char* _error_message;
+  size_t _error_message_size;
+};
+
+} // namespace libtest
+