# HG changeset patch
# User klao
# Date 1105058634 0
# Node ID cbc27743e17a8440f2d7c4590327c1a65f56cdd6
# Parent  f901ff02b2d7c1200847b946eacdf5ee582d37c1
Exception hierarchy sketch.
Exception safe exception classes.

diff -r f901ff02b2d7 -r cbc27743e17a src/work/klao/error.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/work/klao/error.h	Fri Jan 07 00:43:54 2005 +0000
@@ -0,0 +1,188 @@
+/* -*- C++ -*-
+ * src/lemon/error.h - Part of LEMON, a generic C++ optimization library
+ *
+ * Copyright (C) 2004 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
+ * (Egervary Combinatorial Optimization Research Group, EGRES).
+ *
+ * Permission to use, modify and distribute this software is granted
+ * provided that this copyright notice appears in all copies. For
+ * precise terms see the accompanying LICENSE file.
+ *
+ * This software is provided "AS IS" with no warranty of any kind,
+ * express or implied, and with no claim as to its suitability for any
+ * purpose.
+ *
+ */
+
+#ifndef LEMON_ERROR_H
+#define LEMON_ERROR_H
+
+//! \ingroup misc
+//! \file
+//! \brief Basic error handling (signaling) routines.
+
+#include <exception>
+#include <string>
+#include <sstream>
+
+#include <boost/shared_ptr.hpp>
+
+namespace lemon {
+
+  /// Exception-safe convenient "error message" class.
+  class ErrorMessage {
+  protected:
+    boost::shared_ptr<std::ostringstream> buf;
+    
+    bool init() throw() {
+      try {
+	buf.reset(new std::ostringstream);
+      }
+      catch(...) {
+	buf.reset();
+      }
+      return buf;
+    }
+
+  public:
+
+    ErrorMessage() throw() { init(); }
+
+    ErrorMessage(const char *message) throw() {
+      init();
+      *this << message;
+    }
+
+    ErrorMessage(const std::string &message) throw() {
+      init();
+      *this << message;
+    }
+
+    template <typename T>
+    ErrorMessage& operator<<(const T &t) throw() {
+      if( !buf ) return *this;
+
+      try {
+	*buf << t;
+      }
+      catch(...) {
+	buf.reset();
+      }
+    }
+
+    const char* message() throw() {
+      if( !buf ) return 0;
+
+      const char* mes = 0;
+      try {
+	mes = buf->str().c_str();
+      }
+      catch(...) {}
+      return mes;
+    }
+    
+  };
+
+  /**
+   * \brief Generic exception class.
+   *
+   * Base class for exceptions used in LEMON.
+   */
+  class Exception : public std::exception, public ErrorMessage {
+  public:
+    Exception() throw() {}
+    explicit Exception(const std::string &s) throw()
+      : ErrorMessage(s) {}
+    virtual ~Exception() throw() {}
+    
+    virtual const char* what() const throw() {
+      const char *mes = message();
+      if( mes ) return mes;
+      return "lemon::Exception";
+    }
+  };
+
+
+  class LogicError : public Exception {
+    explicit LogicError(const std::string &s)
+      : Exception(s) {}
+  };
+
+  class RuntimeError : public Exception {
+    explicit RuntimeError(const std::string &s)
+      : Exception(s) {}
+  };
+
+  class RangeError : public RuntimeError {
+    explicit RangeError(const std::string &s)
+      : RuntimeError(s) {}
+  };
+
+  class IOError : public RuntimeError {
+    explicit IOError(const std::string &s)
+      : RuntimeError(s) {}
+  };
+
+  class DataFormatError : public IOError {
+    explicit DataFormatError(const std::string &message)
+      : IOError(message) : line(0) {}
+    DataFormatError(const std::string &file_name, int line_num,
+		    sconst std::string &message)
+      : IOError(message), line(line_num) { set_file(file_name); }
+
+    void set_line(int line_num) { line=line_num; }
+    void set_file(const std::string &file_name) {
+      try {
+	file.reset(new std::string);
+	*file = file_name;
+      }
+      catch(...) {
+	file.reset();
+      }
+    }
+
+    virtual const char* what() const {
+      const char *mes = 0;
+      try {
+	std::ostringstream ostr;
+	ostr << IOError::what();
+	if( file || line ) {
+	  ostr << " (";
+	  if( file ) ostr << "in file" << *file;
+	  if( line ) ostr << " at line" << line;
+	}
+	mes = ostr.str().c_str();
+      }
+      catch(...) {}
+      if( mes ) return mes;
+      return "lemon::DataFormatError";
+    }
+  };
+
+
+
+  /****************  Macros  ****************/
+
+
+  /**
+   * \brief Macro for assertions with customizable message
+   */
+
+# define lemon_assert(exp, msg) \
+    if(!(exp)) { \
+      std::cerr << __FILE__ ":" << __LINE__ << ": " << (msg) << std::endl; \
+      abort; \
+    }
+
+
+  /**
+   * \brief Macro for mark not yet implemented features.
+   *
+   * \todo Is this the right place for this? It should be used only in
+   * modules under development.
+   */
+
+# define FIXME(msg) lemon_assert(0, "FIXME: " msg)
+
+}
+#endif // LEMON_ERROR_H