lemon/error.h
changeset 76 fc178a057bbd
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     1 /* -*- C++ -*-
       
     2  *
       
     3  * This file is a part of LEMON, a generic C++ optimization library
       
     4  *
       
     5  * Copyright (C) 2003-2008
       
     6  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
       
     7  * (Egervary Research Group on Combinatorial Optimization, EGRES).
       
     8  *
       
     9  * Permission to use, modify and distribute this software is granted
       
    10  * provided that this copyright notice appears in all copies. For
       
    11  * precise terms see the accompanying LICENSE file.
       
    12  *
       
    13  * This software is provided "AS IS" with no warranty of any kind,
       
    14  * express or implied, and with no claim as to its suitability for any
       
    15  * purpose.
       
    16  *
       
    17  */
       
    18 
       
    19 #ifndef LEMON_ERROR_H
       
    20 #define LEMON_ERROR_H
       
    21 
       
    22 /// \ingroup exceptions
       
    23 /// \file
       
    24 /// \brief Basic exception classes and error handling.
       
    25 
       
    26 #include <exception>
       
    27 #include <string>
       
    28 #include <sstream>
       
    29 #include <iostream>
       
    30 #include <cstdlib>
       
    31 #include <memory>
       
    32 
       
    33 namespace lemon {
       
    34 
       
    35   /// \addtogroup exceptions
       
    36   /// @{
       
    37 
       
    38   /// \brief Exception safe wrapper class.
       
    39   ///
       
    40   /// Exception safe wrapper class to implement the members of exceptions.
       
    41   template <typename _Type>
       
    42   class ExceptionMember {
       
    43   public:
       
    44     typedef _Type Type;
       
    45 
       
    46     ExceptionMember() throw() {
       
    47       try {
       
    48 	ptr.reset(new Type());
       
    49       } catch (...) {}
       
    50     }
       
    51 
       
    52     ExceptionMember(const Type& type) throw() {
       
    53       try {
       
    54 	ptr.reset(new Type());
       
    55 	if (ptr.get() == 0) return;
       
    56 	*ptr = type;
       
    57       } catch (...) {}
       
    58     }
       
    59 
       
    60     ExceptionMember(const ExceptionMember& copy) throw() {
       
    61       try {
       
    62 	if (!copy.valid()) return;
       
    63 	ptr.reset(new Type());
       
    64 	if (ptr.get() == 0) return;
       
    65 	*ptr = copy.get();
       
    66       } catch (...) {}
       
    67     }
       
    68 
       
    69     ExceptionMember& operator=(const ExceptionMember& copy) throw() {
       
    70       if (ptr.get() == 0) return;
       
    71       try {
       
    72 	if (!copy.valid()) return;
       
    73  	*ptr = copy.get();
       
    74       } catch (...) {}
       
    75     }
       
    76 
       
    77     void set(const Type& type) throw() {
       
    78       if (ptr.get() == 0) return;
       
    79       try {
       
    80 	*ptr = type;
       
    81       } catch (...) {}
       
    82     }
       
    83 
       
    84     const Type& get() const {
       
    85       return *ptr;
       
    86     }
       
    87 
       
    88     bool valid() const throw() {
       
    89       return ptr.get() != 0;
       
    90     }
       
    91 
       
    92   private:
       
    93     std::auto_ptr<_Type> ptr;
       
    94   };
       
    95 
       
    96   /// Exception-safe convenient "error message" class.
       
    97 
       
    98   /// Helper class which provides a convenient ostream-like (operator <<
       
    99   /// based) interface to create a string message. Mostly useful in
       
   100   /// exception classes (therefore the name).
       
   101   class ErrorMessage {
       
   102   protected:
       
   103     ///\e
       
   104 
       
   105     ///\todo The good solution is boost::shared_ptr...
       
   106     ///
       
   107     mutable std::auto_ptr<std::ostringstream> buf;
       
   108 
       
   109     ///\e
       
   110     bool init() throw() {
       
   111       try {
       
   112 	buf.reset(new std::ostringstream);
       
   113       }
       
   114       catch(...) {
       
   115 	buf.reset();
       
   116       }
       
   117       return buf.get();
       
   118     }
       
   119 
       
   120   public:
       
   121 
       
   122     ///\e
       
   123     ErrorMessage() throw() { init(); }
       
   124 
       
   125     ErrorMessage(const ErrorMessage& em) throw() : buf(em.buf) { }
       
   126 
       
   127     ///\e
       
   128     ErrorMessage(const char *msg) throw() {
       
   129       init();
       
   130       *this << msg;
       
   131     }
       
   132 
       
   133     ///\e
       
   134     ErrorMessage(const std::string &msg) throw() {
       
   135       init();
       
   136       *this << msg;
       
   137     }
       
   138 
       
   139     ///\e
       
   140     template <typename T>
       
   141     ErrorMessage& operator<<(const T &t) throw() {
       
   142       if( ! buf.get() ) return *this;
       
   143 
       
   144       try {
       
   145 	*buf << t;
       
   146       }
       
   147       catch(...) {
       
   148 	buf.reset();
       
   149       }
       
   150       return *this;
       
   151     }
       
   152 
       
   153     ///\e
       
   154     const char* message() throw() {
       
   155       if( ! buf.get() ) return 0;
       
   156 
       
   157       const char* mes = 0;
       
   158       try {
       
   159 	mes = buf->str().c_str();
       
   160       }
       
   161       catch(...) {}
       
   162       return mes;
       
   163     }
       
   164 
       
   165   };
       
   166 
       
   167   /// Generic exception class.
       
   168 
       
   169   /// Base class for exceptions used in LEMON.
       
   170   ///
       
   171   class Exception : public std::exception {
       
   172   public:
       
   173     ///\e
       
   174     Exception() {}
       
   175     ///\e
       
   176     virtual ~Exception() throw() {}
       
   177     ///\e
       
   178     virtual const char* what() const throw() {
       
   179       return "lemon::Exception";
       
   180     }
       
   181   };
       
   182 
       
   183   /// One of the two main subclasses of \ref Exception.
       
   184 
       
   185   /// Logic errors represent problems in the internal logic of a program;
       
   186   /// in theory, these are preventable, and even detectable before the
       
   187   /// program runs (e.g. violations of class invariants).
       
   188   ///
       
   189   /// A typical example for this is \ref UninitializedParameter.
       
   190   class LogicError : public Exception {
       
   191   public:
       
   192     virtual const char* what() const throw() {
       
   193       return "lemon::LogicError";
       
   194     }
       
   195   };
       
   196 
       
   197   /// \ref Exception for uninitialized parameters.
       
   198 
       
   199   /// This error represents problems in the initialization
       
   200   /// of the parameters of the algorithms.
       
   201   class UninitializedParameter : public LogicError {
       
   202   public:
       
   203     virtual const char* what() const throw() {
       
   204       return "lemon::UninitializedParameter";
       
   205     }
       
   206   };
       
   207 
       
   208 
       
   209   /// One of the two main subclasses of \ref Exception.
       
   210 
       
   211   /// Runtime errors represent problems outside the scope of a program;
       
   212   /// they cannot be easily predicted and can generally only be caught
       
   213   /// as the program executes.
       
   214   class RuntimeError : public Exception {
       
   215   public:
       
   216     virtual const char* what() const throw() {
       
   217       return "lemon::RuntimeError";
       
   218     }
       
   219   };
       
   220 
       
   221   ///\e
       
   222   class RangeError : public RuntimeError {
       
   223   public:
       
   224     virtual const char* what() const throw() {
       
   225       return "lemon::RangeError";
       
   226     }
       
   227   };
       
   228 
       
   229   ///\e
       
   230   class IoError : public RuntimeError {
       
   231   public:
       
   232     virtual const char* what() const throw() {
       
   233       return "lemon::IoError";
       
   234     }
       
   235   };
       
   236 
       
   237   ///\e
       
   238   class DataFormatError : public IoError {
       
   239   protected:
       
   240     ExceptionMember<std::string> _message;
       
   241     ExceptionMember<std::string> _file;
       
   242     int _line;
       
   243 
       
   244     mutable ExceptionMember<std::string> _message_holder;
       
   245   public:
       
   246 
       
   247     DataFormatError(const DataFormatError &dfe) :
       
   248       IoError(dfe), _message(dfe._message), _file(dfe._file),
       
   249       _line(dfe._line) {}
       
   250 
       
   251     ///\e
       
   252     explicit DataFormatError(const char *the_message)
       
   253       : _message(the_message), _line(0) {}
       
   254 
       
   255     ///\e
       
   256     DataFormatError(const std::string &file_name, int line_num,
       
   257 		    const char *the_message)
       
   258       : _message(the_message), _line(line_num) { file(file_name); }
       
   259 
       
   260     ///\e
       
   261     void line(int ln) { _line = ln; }
       
   262     ///\e
       
   263     void message(const std::string& msg) { _message.set(msg); }
       
   264     ///\e
       
   265     void file(const std::string &fl) { _file.set(fl); }
       
   266 
       
   267     ///\e
       
   268     int line() const { return _line; }
       
   269     ///\e
       
   270     const char* message() const {
       
   271       if (_message.valid() && !_message.get().empty()) {
       
   272 	return _message.get().c_str();
       
   273       } else {
       
   274 	return 0;
       
   275       }
       
   276     }
       
   277 
       
   278     /// \brief Returns the filename.
       
   279     ///
       
   280     /// Returns \e null if the filename was not specified.
       
   281     const char* file() const {
       
   282       if (_file.valid() && !_file.get().empty()) {
       
   283 	return _file.get().c_str();
       
   284       } else {
       
   285 	return 0;
       
   286       }
       
   287     }
       
   288 
       
   289     ///\e
       
   290     virtual const char* what() const throw() {
       
   291       try {
       
   292 	std::ostringstream ostr;
       
   293 	ostr << "lemon:DataFormatError" << ": ";
       
   294 	if (message()) ostr << message();
       
   295 	if( file() || line() != 0 ) {
       
   296 	  ostr << " (";
       
   297 	  if( file() ) ostr << "in file '" << file() << "'";
       
   298 	  if( file() && line() != 0 ) ostr << " ";
       
   299 	  if( line() != 0 ) ostr << "at line " << line();
       
   300 	  ostr << ")";
       
   301 	}
       
   302 	_message_holder.set(ostr.str());
       
   303       }
       
   304       catch (...) {}
       
   305       if( _message_holder.valid()) return _message_holder.get().c_str();
       
   306       return "lemon:DataFormatError";
       
   307     }
       
   308 
       
   309     virtual ~DataFormatError() throw() {}
       
   310   };
       
   311 
       
   312   ///\e
       
   313   class FileOpenError : public IoError {
       
   314   protected:
       
   315     ExceptionMember<std::string> _file;
       
   316 
       
   317     mutable ExceptionMember<std::string> _message_holder;
       
   318   public:
       
   319 
       
   320     FileOpenError(const FileOpenError &foe) :
       
   321       IoError(foe), _file(foe._file) {}
       
   322 
       
   323     ///\e
       
   324     explicit FileOpenError(const std::string& fl)
       
   325       : _file(fl) {}
       
   326 
       
   327 
       
   328     ///\e
       
   329     void file(const std::string &fl) { _file.set(fl); }
       
   330 
       
   331     /// \brief Returns the filename.
       
   332     ///
       
   333     /// Returns \e null if the filename was not specified.
       
   334     const char* file() const {
       
   335       if (_file.valid() && !_file.get().empty()) {
       
   336 	return _file.get().c_str();
       
   337       } else {
       
   338 	return 0;
       
   339       }
       
   340     }
       
   341 
       
   342     ///\e
       
   343     virtual const char* what() const throw() {
       
   344       try {
       
   345 	std::ostringstream ostr;
       
   346 	ostr << "lemon::FileOpenError" << ": ";
       
   347 	ostr << "Cannot open file - " << file();
       
   348 	_message_holder.set(ostr.str());
       
   349       }
       
   350       catch (...) {}
       
   351       if( _message_holder.valid()) return _message_holder.get().c_str();
       
   352       return "lemon::FileOpenError";
       
   353     }
       
   354     virtual ~FileOpenError() throw() {}
       
   355   };
       
   356 
       
   357   class IoParameterError : public IoError {
       
   358   protected:
       
   359     ExceptionMember<std::string> _message;
       
   360     ExceptionMember<std::string> _file;
       
   361 
       
   362     mutable ExceptionMember<std::string> _message_holder;
       
   363   public:
       
   364 
       
   365     IoParameterError(const IoParameterError &ile) :
       
   366       IoError(ile), _message(ile._message), _file(ile._file) {}
       
   367 
       
   368     ///\e
       
   369     explicit IoParameterError(const char *the_message)
       
   370       : _message(the_message) {}
       
   371 
       
   372     ///\e
       
   373     IoParameterError(const char *file_name, const char *the_message)
       
   374       : _message(the_message), _file(file_name) {}
       
   375 
       
   376      ///\e
       
   377     void message(const std::string& msg) { _message.set(msg); }
       
   378     ///\e
       
   379     void file(const std::string &fl) { _file.set(fl); }
       
   380 
       
   381      ///\e
       
   382     const char* message() const {
       
   383       if (_message.valid()) {
       
   384 	return _message.get().c_str();
       
   385       } else {
       
   386 	return 0;
       
   387       }
       
   388     }
       
   389 
       
   390     /// \brief Returns the filename.
       
   391     ///
       
   392     /// Returns \c 0 if the filename was not specified.
       
   393     const char* file() const {
       
   394       if (_file.valid()) {
       
   395 	return _file.get().c_str();
       
   396       } else {
       
   397 	return 0;
       
   398       }
       
   399     }
       
   400 
       
   401     ///\e
       
   402     virtual const char* what() const throw() {
       
   403       try {
       
   404 	std::ostringstream ostr;
       
   405 	if (message()) ostr << message();
       
   406 	if (file()) ostr << "(when reading file '" << file() << "')";
       
   407 	_message_holder.set(ostr.str());
       
   408       }
       
   409       catch (...) {}
       
   410       if( _message_holder.valid() ) return _message_holder.get().c_str();
       
   411       return "lemon:IoParameterError";
       
   412     }
       
   413     virtual ~IoParameterError() throw() {}
       
   414   };
       
   415 
       
   416 
       
   417   ///\e
       
   418   class AssertionFailedError : public LogicError {
       
   419   protected:
       
   420     const char *assertion;
       
   421     const char *file;
       
   422     int line;
       
   423     const char *function;
       
   424     const char *message;
       
   425 
       
   426     mutable ExceptionMember<std::string> _message_holder;
       
   427   public:
       
   428     ///\e
       
   429     AssertionFailedError(const char *_file, int _line, const char *func,
       
   430 			 const char *msg, const char *_assertion = 0) :
       
   431       assertion(_assertion), file(_file), line(_line), function(func),
       
   432       message(msg) {}
       
   433 
       
   434     ///\e
       
   435     const char* get_assertion() const { return assertion; }
       
   436     ///\e
       
   437     const char* get_message() const { return message; }
       
   438     ///\e
       
   439     const char* get_file() const { return file; }
       
   440     ///\e
       
   441     const char* get_function() const { return function; }
       
   442     ///\e
       
   443     int get_line() const { return line; }
       
   444 
       
   445 
       
   446     virtual const char* what() const throw() {
       
   447       try {
       
   448 	std::ostringstream ostr;
       
   449 	ostr << file << ":" << line << ": ";
       
   450 	if( function )
       
   451 	  ostr << function << ": ";
       
   452 	ostr << message;
       
   453 	if( assertion )
       
   454 	   ostr << " (assertion '" << assertion << "' failed)";
       
   455 	_message_holder.set(ostr.str());
       
   456 	return ostr.str().c_str();
       
   457       }
       
   458       catch(...) {}
       
   459       if( _message_holder.valid() ) return _message_holder.get().c_str();
       
   460       return "lemon::AssertionFailedError";
       
   461     }
       
   462    virtual ~AssertionFailedError() throw() {}
       
   463   };
       
   464 
       
   465 
       
   466   /****************  Macros  ****************/
       
   467 
       
   468 
       
   469   template <typename Exception>
       
   470   inline void assert_fail(const char *file, int line,
       
   471                           const char *func,
       
   472                           Exception exception,
       
   473                           const char *assertion = 0,
       
   474                           bool do_abort=true)
       
   475   {
       
   476     using namespace std;
       
   477     cerr << file << ":" << line << ": ";
       
   478     if (func)
       
   479       cerr << func << ": ";
       
   480     cerr << exception.what();
       
   481     if (assertion)
       
   482       cerr << " (assertion '" << assertion << "' failed)";
       
   483     cerr << endl;
       
   484     if (do_abort)
       
   485       abort();
       
   486   }
       
   487 
       
   488   template <>
       
   489   inline void assert_fail<const char *>(const char *file, int line,
       
   490                                         const char *func,
       
   491                                         const char *message,
       
   492                                         const char *assertion,
       
   493                                         bool do_abort)
       
   494   {
       
   495     using namespace std;
       
   496     cerr << file << ":" << line << ": ";
       
   497     if (func)
       
   498       cerr << func << ": ";
       
   499     cerr << message;
       
   500     if (assertion)
       
   501       cerr << " (assertion '" << assertion << "' failed)";
       
   502     cerr << endl;
       
   503     if (do_abort)
       
   504       abort();
       
   505   }
       
   506 
       
   507   template <>
       
   508   inline void assert_fail<std::string>(const char *file, int line,
       
   509                                        const char *func,
       
   510                                        std::string message,
       
   511                                        const char *assertion,
       
   512                                        bool do_abort)
       
   513   {
       
   514     assert_fail(file, line, func, message.c_str(), assertion, do_abort);
       
   515   }
       
   516 
       
   517   template <typename Exception>
       
   518   inline void assert_fail_failure(const char *file, int line, const char *func,
       
   519 			   Exception exception,
       
   520 			   const char *assertion = 0,
       
   521 			   bool = true)
       
   522   {
       
   523     throw AssertionFailedError(file, line, func, exception.what(), assertion);
       
   524   }
       
   525 
       
   526   template <>
       
   527   inline void assert_fail_failure<const char *>(const char *file, int line,
       
   528                                                 const char *func,
       
   529                                                 const char *message,
       
   530                                                 const char *assertion,
       
   531                                                 bool)
       
   532   {
       
   533     throw AssertionFailedError(file, line, func, message, assertion);
       
   534   }
       
   535 
       
   536   template <>
       
   537   inline void assert_fail_failure<std::string>(const char *file, int line,
       
   538                                                const char *func,
       
   539                                                std::string message,
       
   540                                                const char *assertion,
       
   541                                                bool)
       
   542   {
       
   543     assert_fail_failure(file, line, func, message.c_str(), assertion, true);
       
   544   }
       
   545 
       
   546   template <typename Exception>
       
   547   inline void assert_fail_exception(const char *file, int line, const char *func,
       
   548 			     Exception exception,
       
   549 			     const char *assertion = 0, bool = true)
       
   550   {
       
   551     throw exception;
       
   552   }
       
   553 
       
   554   template <>
       
   555   inline void assert_fail_exception<const char *>(const char *file, int line,
       
   556 					   const char *func,
       
   557 					   const char *message,
       
   558 					   const char *assertion,
       
   559 					   bool)
       
   560   {
       
   561     throw AssertionFailedError(file, line, func, message, assertion);
       
   562   }
       
   563 
       
   564   template <>
       
   565   inline void assert_fail_exception<std::string>(const char *file, int line,
       
   566                                                  const char *func,
       
   567                                                  std::string message,
       
   568                                                  const char *assertion,
       
   569                                                  bool)
       
   570   {
       
   571     assert_fail_exception(file, line, func, message.c_str(), assertion, true);
       
   572   }
       
   573 
       
   574 /// @}
       
   575 
       
   576 }
       
   577 #endif // LEMON_ERROR_H
       
   578 
       
   579 #undef LEMON_ASSERT
       
   580 #undef LEMON_FIXME
       
   581 
       
   582 #ifdef LEMON_ENABLE_ASSERTS
       
   583 #  define LEMON_ASSERT_ABORT
       
   584 #endif
       
   585 
       
   586 #ifndef LEMON_ASSERT_DO_ABORT
       
   587 #  define LEMON_ASSERT_DO_ABORT 1
       
   588 #endif
       
   589 
       
   590 #ifndef LEMON_ASSERT_HANDLER
       
   591 #  if defined LEMON_ASSERT_EXCEPTION
       
   592 #    define LEMON_ASSERT_HANDLER ::lemon::assert_fail_exception
       
   593 #  elif defined LEMON_ASSERT_FAILURE
       
   594 #    define LEMON_ASSERT_HANDLER ::lemon::assert_fail_failure
       
   595 #  elif defined LEMON_ASSERT_ABORT
       
   596 #    define LEMON_ASSERT_HANDLER ::lemon::assert_fail
       
   597 #  else
       
   598 #    define LEMON_DISABLE_ASSERTS
       
   599 #  endif
       
   600 #endif
       
   601 
       
   602 #ifdef DOXYGEN
       
   603 
       
   604 /// \brief Macro for assertions with customizable message
       
   605 ///
       
   606 /// Macro for assertions with customizable message.
       
   607 ///
       
   608 /// The assertions are disabled in the default behaviour. You can
       
   609 /// enable the assertions with the
       
   610 /// \code
       
   611 /// #define LEMON_ENABLE_ASSERTS
       
   612 /// \endcode
       
   613 /// Then an assert
       
   614 /// provides a log on the standard error about the assertion and aborts
       
   615 /// the program if LEMON_ASSERT_DO_ABORT is also defined (otherwise the
       
   616 /// program keeps on running).
       
   617 /// By defining LEMON_ASSERT_FAILURE or
       
   618 /// LEMON_ASSERT_EXCEPTION, you can set other behaviour to the
       
   619 /// assertions. In case LEMON_ASSERT_FAILURE is given, LEMON_ASSERT
       
   620 /// will always throw an \c AssertionFailedError exception with
       
   621 /// the \c msg error message. By using
       
   622 /// LEMON_ASSERT_EXCEPTION, one can define an arbitrary exception to be thrown.
       
   623 ///
       
   624 /// The LEMON_ASSERT macro should be called with the \c exp parameter
       
   625 /// which should be an expression convertible to bool. If the given
       
   626 /// parameter is false the assertion is raised and one of the assertion
       
   627 /// behaviour will be activated. The \c msg should be either a const
       
   628 /// char* message or an exception. When the \c msg is an exception the
       
   629 /// \ref lemon::Exception::what() "what()" function is called to retrieve and
       
   630 /// display the error message.
       
   631 ///
       
   632 /// \todo We should provide some way to reset to the default behaviour,
       
   633 /// shouldn't we?
       
   634 ///
       
   635 /// \todo This whole 'assert' business should be placed in a separate
       
   636 /// include file. The boost assert is not guarded by header sentries
       
   637 /// which may help to change the behaviour of the assertions in
       
   638 /// the files.
       
   639 ///
       
   640 /// \todo __PRETTY_FUNCTION__ should be replaced by something
       
   641 /// compiler-independent, like BOOST_CURRENT_FUNCTION
       
   642 
       
   643 #  define LEMON_ASSERT(exp, msg)                 \
       
   644      (static_cast<void> (!!(exp) ? 0 : (         \
       
   645        LEMON_ASSERT_HANDLER(__FILE__, __LINE__,  \
       
   646                             __PRETTY_FUNCTION__, \
       
   647                             msg, #exp, LEMON_ASSERT_DO_ABORT), 0)))
       
   648 
       
   649 #else
       
   650 #  if defined LEMON_DISABLE_ASSERTS
       
   651 
       
   652 #    define LEMON_ASSERT(exp, msg)  (static_cast<void> (0))
       
   653 
       
   654 #  else
       
   655 #    define LEMON_ASSERT(exp, msg)                 \
       
   656        (static_cast<void> (!!(exp) ? 0 : (         \
       
   657          LEMON_ASSERT_HANDLER(__FILE__, __LINE__,  \
       
   658                               __PRETTY_FUNCTION__, \
       
   659                               msg, #exp, LEMON_ASSERT_DO_ABORT), 0)))
       
   660 #  endif
       
   661 #endif
       
   662 
       
   663 /**
       
   664  * \brief Macro for mark not yet implemented features.
       
   665  *
       
   666  * \todo Is this the right place for this? It should be used only in
       
   667  * modules under development.
       
   668  *
       
   669  * \todo __PRETTY_FUNCTION__ should be replaced by something
       
   670  * compiler-independent, like BOOST_CURRENT_FUNCTION
       
   671  */
       
   672 
       
   673 #define LEMON_FIXME(msg) \
       
   674     (LEMON_ASSERT_HANDLER(__FILE__, __LINE__, __PRETTY_FUNCTION__, \
       
   675 			  "FIXME: " msg))