lemon/error.h
author Peter Kovacs <kpeter@inf.elte.hu>
Sat, 15 Mar 2008 20:21:21 +0100
changeset 79 d73c2e8b25cb
child 108 889d0c289d19
permissions -rw-r--r--
More exact concept checking for map concepts.
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/* -*- C++ -*-
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 *
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 * This file is a part of LEMON, a generic C++ optimization library
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 *
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 * Copyright (C) 2003-2008
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 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
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 * (Egervary Research Group on Combinatorial Optimization, EGRES).
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 *
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 * Permission to use, modify and distribute this software is granted
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 * provided that this copyright notice appears in all copies. For
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 * precise terms see the accompanying LICENSE file.
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 *
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 * This software is provided "AS IS" with no warranty of any kind,
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 * express or implied, and with no claim as to its suitability for any
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 * purpose.
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 *
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 */
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#ifndef LEMON_ERROR_H
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#define LEMON_ERROR_H
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/// \ingroup exceptions
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/// \file
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/// \brief Basic exception classes and error handling.
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#include <exception>
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#include <string>
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#include <sstream>
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#include <iostream>
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#include <cstdlib>
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#include <memory>
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namespace lemon {
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  /// \addtogroup exceptions
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  /// @{
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  /// \brief Exception safe wrapper class.
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  ///
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  /// Exception safe wrapper class to implement the members of exceptions.
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  template <typename _Type>
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  class ExceptionMember {
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  public:
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    typedef _Type Type;
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    ExceptionMember() throw() {
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      try {
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	ptr.reset(new Type());
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      } catch (...) {}
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    }
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    ExceptionMember(const Type& type) throw() {
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      try {
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	ptr.reset(new Type());
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	if (ptr.get() == 0) return;
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	*ptr = type;
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      } catch (...) {}
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    }
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    ExceptionMember(const ExceptionMember& copy) throw() {
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      try {
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	if (!copy.valid()) return;
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	ptr.reset(new Type());
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	if (ptr.get() == 0) return;
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	*ptr = copy.get();
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      } catch (...) {}
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    }
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    ExceptionMember& operator=(const ExceptionMember& copy) throw() {
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      if (ptr.get() == 0) return;
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      try {
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	if (!copy.valid()) return;
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 	*ptr = copy.get();
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      } catch (...) {}
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    }
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    void set(const Type& type) throw() {
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      if (ptr.get() == 0) return;
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      try {
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	*ptr = type;
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      } catch (...) {}
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    }
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    const Type& get() const {
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      return *ptr;
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    }
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    bool valid() const throw() {
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      return ptr.get() != 0;
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    }
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  private:
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    std::auto_ptr<_Type> ptr;
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  };
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  /// Exception-safe convenient "error message" class.
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  /// Helper class which provides a convenient ostream-like (operator <<
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  /// based) interface to create a string message. Mostly useful in
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  /// exception classes (therefore the name).
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  class ErrorMessage {
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  protected:
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    ///\e
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    ///\todo The good solution is boost::shared_ptr...
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    ///
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    mutable std::auto_ptr<std::ostringstream> buf;
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    ///\e
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    bool init() throw() {
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      try {
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	buf.reset(new std::ostringstream);
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      }
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      catch(...) {
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	buf.reset();
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      }
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      return buf.get();
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    }
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  public:
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    ///\e
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    ErrorMessage() throw() { init(); }
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    ErrorMessage(const ErrorMessage& em) throw() : buf(em.buf) { }
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    ///\e
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    ErrorMessage(const char *msg) throw() {
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      init();
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      *this << msg;
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    }
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    ///\e
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    ErrorMessage(const std::string &msg) throw() {
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      init();
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      *this << msg;
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    }
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    ///\e
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    template <typename T>
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    ErrorMessage& operator<<(const T &t) throw() {
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      if( ! buf.get() ) return *this;
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      try {
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	*buf << t;
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      }
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      catch(...) {
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	buf.reset();
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      }
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      return *this;
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    }
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    ///\e
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    const char* message() throw() {
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      if( ! buf.get() ) return 0;
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      const char* mes = 0;
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      try {
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	mes = buf->str().c_str();
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      }
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      catch(...) {}
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      return mes;
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    }
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  };
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  /// Generic exception class.
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  /// Base class for exceptions used in LEMON.
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  ///
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  class Exception : public std::exception {
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  public:
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    ///\e
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    Exception() {}
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    ///\e
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    virtual ~Exception() throw() {}
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    ///\e
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    virtual const char* what() const throw() {
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      return "lemon::Exception";
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    }
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  };
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  /// One of the two main subclasses of \ref Exception.
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  /// Logic errors represent problems in the internal logic of a program;
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  /// in theory, these are preventable, and even detectable before the
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  /// program runs (e.g. violations of class invariants).
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  ///
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  /// A typical example for this is \ref UninitializedParameter.
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  class LogicError : public Exception {
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  public:
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    virtual const char* what() const throw() {
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      return "lemon::LogicError";
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    }
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  };
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  /// \ref Exception for uninitialized parameters.
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  /// This error represents problems in the initialization
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  /// of the parameters of the algorithms.
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  class UninitializedParameter : public LogicError {
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  public:
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    virtual const char* what() const throw() {
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      return "lemon::UninitializedParameter";
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    }
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  };
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  /// One of the two main subclasses of \ref Exception.
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  /// Runtime errors represent problems outside the scope of a program;
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  /// they cannot be easily predicted and can generally only be caught
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  /// as the program executes.
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  class RuntimeError : public Exception {
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  public:
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    virtual const char* what() const throw() {
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      return "lemon::RuntimeError";
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    }
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  };
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  ///\e
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  class RangeError : public RuntimeError {
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  public:
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    virtual const char* what() const throw() {
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      return "lemon::RangeError";
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    }
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  };
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  ///\e
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  class IoError : public RuntimeError {
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  public:
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    virtual const char* what() const throw() {
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      return "lemon::IoError";
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    }
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  };
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  ///\e
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  class DataFormatError : public IoError {
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  protected:
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    ExceptionMember<std::string> _message;
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    ExceptionMember<std::string> _file;
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    int _line;
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    mutable ExceptionMember<std::string> _message_holder;
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  public:
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    DataFormatError(const DataFormatError &dfe) :
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      IoError(dfe), _message(dfe._message), _file(dfe._file),
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      _line(dfe._line) {}
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    ///\e
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    explicit DataFormatError(const char *the_message)
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      : _message(the_message), _line(0) {}
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    ///\e
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    DataFormatError(const std::string &file_name, int line_num,
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		    const char *the_message)
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      : _message(the_message), _line(line_num) { file(file_name); }
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    ///\e
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    void line(int ln) { _line = ln; }
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    ///\e
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    void message(const std::string& msg) { _message.set(msg); }
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    ///\e
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    void file(const std::string &fl) { _file.set(fl); }
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    ///\e
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    int line() const { return _line; }
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    ///\e
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    const char* message() const {
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      if (_message.valid() && !_message.get().empty()) {
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	return _message.get().c_str();
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      } else {
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	return 0;
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      }
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    }
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    /// \brief Returns the filename.
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    ///
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    /// Returns \e null if the filename was not specified.
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    const char* file() const {
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      if (_file.valid() && !_file.get().empty()) {
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	return _file.get().c_str();
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      } else {
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	return 0;
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      }
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    }
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    ///\e
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    virtual const char* what() const throw() {
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      try {
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	std::ostringstream ostr;
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	ostr << "lemon:DataFormatError" << ": ";
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	if (message()) ostr << message();
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	if( file() || line() != 0 ) {
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	  ostr << " (";
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	  if( file() ) ostr << "in file '" << file() << "'";
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	  if( file() && line() != 0 ) ostr << " ";
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	  if( line() != 0 ) ostr << "at line " << line();
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	  ostr << ")";
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	}
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	_message_holder.set(ostr.str());
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      }
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      catch (...) {}
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      if( _message_holder.valid()) return _message_holder.get().c_str();
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      return "lemon:DataFormatError";
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    }
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    virtual ~DataFormatError() throw() {}
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  };
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  ///\e
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  class FileOpenError : public IoError {
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  protected:
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    ExceptionMember<std::string> _file;
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    mutable ExceptionMember<std::string> _message_holder;
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  public:
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    FileOpenError(const FileOpenError &foe) :
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      IoError(foe), _file(foe._file) {}
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    ///\e
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    explicit FileOpenError(const std::string& fl)
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      : _file(fl) {}
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    ///\e
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    void file(const std::string &fl) { _file.set(fl); }
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    /// \brief Returns the filename.
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    ///
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    /// Returns \e null if the filename was not specified.
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    const char* file() const {
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      if (_file.valid() && !_file.get().empty()) {
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	return _file.get().c_str();
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      } else {
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	return 0;
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      }
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    }
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    ///\e
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    virtual const char* what() const throw() {
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      try {
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	std::ostringstream ostr;
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	ostr << "lemon::FileOpenError" << ": ";
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	ostr << "Cannot open file - " << file();
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	_message_holder.set(ostr.str());
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      }
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      catch (...) {}
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      if( _message_holder.valid()) return _message_holder.get().c_str();
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      return "lemon::FileOpenError";
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    }
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    virtual ~FileOpenError() throw() {}
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  };
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  class IoParameterError : public IoError {
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  protected:
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    ExceptionMember<std::string> _message;
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    ExceptionMember<std::string> _file;
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    mutable ExceptionMember<std::string> _message_holder;
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  public:
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    IoParameterError(const IoParameterError &ile) :
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      IoError(ile), _message(ile._message), _file(ile._file) {}
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    ///\e
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    explicit IoParameterError(const char *the_message)
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      : _message(the_message) {}
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    ///\e
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    IoParameterError(const char *file_name, const char *the_message)
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      : _message(the_message), _file(file_name) {}
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     ///\e
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    void message(const std::string& msg) { _message.set(msg); }
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    ///\e
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    void file(const std::string &fl) { _file.set(fl); }
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     ///\e
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    const char* message() const {
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      if (_message.valid()) {
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	return _message.get().c_str();
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      } else {
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	return 0;
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      }
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    }
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    /// \brief Returns the filename.
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    ///
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    /// Returns \c 0 if the filename was not specified.
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    const char* file() const {
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      if (_file.valid()) {
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	return _file.get().c_str();
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      } else {
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	return 0;
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      }
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    }
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    ///\e
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    virtual const char* what() const throw() {
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      try {
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	std::ostringstream ostr;
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	if (message()) ostr << message();
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	if (file()) ostr << "(when reading file '" << file() << "')";
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	_message_holder.set(ostr.str());
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      }
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      catch (...) {}
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      if( _message_holder.valid() ) return _message_holder.get().c_str();
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      return "lemon:IoParameterError";
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    }
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    virtual ~IoParameterError() throw() {}
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  };
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  ///\e
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  class AssertionFailedError : public LogicError {
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  protected:
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    const char *assertion;
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    const char *file;
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    int line;
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    const char *function;
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    const char *message;
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    mutable ExceptionMember<std::string> _message_holder;
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  public:
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    ///\e
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    AssertionFailedError(const char *_file, int _line, const char *func,
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			 const char *msg, const char *_assertion = 0) :
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      assertion(_assertion), file(_file), line(_line), function(func),
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      message(msg) {}
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    ///\e
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    const char* get_assertion() const { return assertion; }
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    ///\e
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    const char* get_message() const { return message; }
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    ///\e
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    const char* get_file() const { return file; }
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    ///\e
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    const char* get_function() const { return function; }
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    ///\e
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    int get_line() const { return line; }
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   444
kpeter@66
   445
kpeter@66
   446
    virtual const char* what() const throw() {
kpeter@66
   447
      try {
kpeter@66
   448
	std::ostringstream ostr;
kpeter@66
   449
	ostr << file << ":" << line << ": ";
kpeter@66
   450
	if( function )
kpeter@66
   451
	  ostr << function << ": ";
kpeter@66
   452
	ostr << message;
kpeter@66
   453
	if( assertion )
kpeter@66
   454
	   ostr << " (assertion '" << assertion << "' failed)";
kpeter@66
   455
	_message_holder.set(ostr.str());
kpeter@66
   456
	return ostr.str().c_str();
kpeter@66
   457
      }
kpeter@66
   458
      catch(...) {}
kpeter@66
   459
      if( _message_holder.valid() ) return _message_holder.get().c_str();
kpeter@66
   460
      return "lemon::AssertionFailedError";
kpeter@66
   461
    }
kpeter@66
   462
   virtual ~AssertionFailedError() throw() {}
kpeter@66
   463
  };
kpeter@66
   464
kpeter@66
   465
kpeter@66
   466
  /****************  Macros  ****************/
kpeter@66
   467
kpeter@66
   468
kpeter@66
   469
  template <typename Exception>
kpeter@66
   470
  inline void assert_fail(const char *file, int line,
kpeter@66
   471
                          const char *func,
kpeter@66
   472
                          Exception exception,
kpeter@66
   473
                          const char *assertion = 0,
kpeter@66
   474
                          bool do_abort=true)
kpeter@66
   475
  {
kpeter@66
   476
    using namespace std;
kpeter@66
   477
    cerr << file << ":" << line << ": ";
kpeter@66
   478
    if (func)
kpeter@66
   479
      cerr << func << ": ";
kpeter@66
   480
    cerr << exception.what();
kpeter@66
   481
    if (assertion)
kpeter@66
   482
      cerr << " (assertion '" << assertion << "' failed)";
kpeter@66
   483
    cerr << endl;
kpeter@66
   484
    if (do_abort)
kpeter@66
   485
      abort();
kpeter@66
   486
  }
kpeter@66
   487
kpeter@66
   488
  template <>
kpeter@66
   489
  inline void assert_fail<const char *>(const char *file, int line,
kpeter@66
   490
                                        const char *func,
kpeter@66
   491
                                        const char *message,
kpeter@66
   492
                                        const char *assertion,
kpeter@66
   493
                                        bool do_abort)
kpeter@66
   494
  {
kpeter@66
   495
    using namespace std;
kpeter@66
   496
    cerr << file << ":" << line << ": ";
kpeter@66
   497
    if (func)
kpeter@66
   498
      cerr << func << ": ";
kpeter@66
   499
    cerr << message;
kpeter@66
   500
    if (assertion)
kpeter@66
   501
      cerr << " (assertion '" << assertion << "' failed)";
kpeter@66
   502
    cerr << endl;
kpeter@66
   503
    if (do_abort)
kpeter@66
   504
      abort();
kpeter@66
   505
  }
kpeter@66
   506
kpeter@66
   507
  template <>
kpeter@66
   508
  inline void assert_fail<std::string>(const char *file, int line,
kpeter@66
   509
                                       const char *func,
kpeter@66
   510
                                       std::string message,
kpeter@66
   511
                                       const char *assertion,
kpeter@66
   512
                                       bool do_abort)
kpeter@66
   513
  {
kpeter@66
   514
    assert_fail(file, line, func, message.c_str(), assertion, do_abort);
kpeter@66
   515
  }
kpeter@66
   516
kpeter@66
   517
  template <typename Exception>
kpeter@66
   518
  inline void assert_fail_failure(const char *file, int line, const char *func,
kpeter@66
   519
			   Exception exception,
kpeter@66
   520
			   const char *assertion = 0,
kpeter@66
   521
			   bool = true)
kpeter@66
   522
  {
kpeter@66
   523
    throw AssertionFailedError(file, line, func, exception.what(), assertion);
kpeter@66
   524
  }
kpeter@66
   525
kpeter@66
   526
  template <>
kpeter@66
   527
  inline void assert_fail_failure<const char *>(const char *file, int line,
kpeter@66
   528
                                                const char *func,
kpeter@66
   529
                                                const char *message,
kpeter@66
   530
                                                const char *assertion,
kpeter@66
   531
                                                bool)
kpeter@66
   532
  {
kpeter@66
   533
    throw AssertionFailedError(file, line, func, message, assertion);
kpeter@66
   534
  }
kpeter@66
   535
kpeter@66
   536
  template <>
kpeter@66
   537
  inline void assert_fail_failure<std::string>(const char *file, int line,
kpeter@66
   538
                                               const char *func,
kpeter@66
   539
                                               std::string message,
kpeter@66
   540
                                               const char *assertion,
kpeter@66
   541
                                               bool)
kpeter@66
   542
  {
kpeter@66
   543
    assert_fail_failure(file, line, func, message.c_str(), assertion, true);
kpeter@66
   544
  }
kpeter@66
   545
kpeter@66
   546
  template <typename Exception>
kpeter@66
   547
  inline void assert_fail_exception(const char *file, int line, const char *func,
kpeter@66
   548
			     Exception exception,
kpeter@66
   549
			     const char *assertion = 0, bool = true)
kpeter@66
   550
  {
kpeter@66
   551
    throw exception;
kpeter@66
   552
  }
kpeter@66
   553
kpeter@66
   554
  template <>
kpeter@66
   555
  inline void assert_fail_exception<const char *>(const char *file, int line,
kpeter@66
   556
					   const char *func,
kpeter@66
   557
					   const char *message,
kpeter@66
   558
					   const char *assertion,
kpeter@66
   559
					   bool)
kpeter@66
   560
  {
kpeter@66
   561
    throw AssertionFailedError(file, line, func, message, assertion);
kpeter@66
   562
  }
kpeter@66
   563
kpeter@66
   564
  template <>
kpeter@66
   565
  inline void assert_fail_exception<std::string>(const char *file, int line,
kpeter@66
   566
                                                 const char *func,
kpeter@66
   567
                                                 std::string message,
kpeter@66
   568
                                                 const char *assertion,
kpeter@66
   569
                                                 bool)
kpeter@66
   570
  {
kpeter@66
   571
    assert_fail_exception(file, line, func, message.c_str(), assertion, true);
kpeter@66
   572
  }
kpeter@66
   573
kpeter@66
   574
/// @}
kpeter@66
   575
kpeter@66
   576
}
kpeter@66
   577
#endif // LEMON_ERROR_H
kpeter@66
   578
kpeter@66
   579
#undef LEMON_ASSERT
kpeter@66
   580
#undef LEMON_FIXME
kpeter@66
   581
kpeter@66
   582
#ifdef LEMON_ENABLE_ASSERTS
kpeter@66
   583
#  define LEMON_ASSERT_ABORT
kpeter@66
   584
#endif
kpeter@66
   585
kpeter@66
   586
#ifndef LEMON_ASSERT_DO_ABORT
kpeter@66
   587
#  define LEMON_ASSERT_DO_ABORT 1
kpeter@66
   588
#endif
kpeter@66
   589
kpeter@66
   590
#ifndef LEMON_ASSERT_HANDLER
kpeter@66
   591
#  if defined LEMON_ASSERT_EXCEPTION
kpeter@66
   592
#    define LEMON_ASSERT_HANDLER ::lemon::assert_fail_exception
kpeter@66
   593
#  elif defined LEMON_ASSERT_FAILURE
kpeter@66
   594
#    define LEMON_ASSERT_HANDLER ::lemon::assert_fail_failure
kpeter@66
   595
#  elif defined LEMON_ASSERT_ABORT
kpeter@66
   596
#    define LEMON_ASSERT_HANDLER ::lemon::assert_fail
kpeter@66
   597
#  else
kpeter@66
   598
#    define LEMON_DISABLE_ASSERTS
kpeter@66
   599
#  endif
kpeter@66
   600
#endif
kpeter@66
   601
kpeter@66
   602
#ifdef DOXYGEN
kpeter@66
   603
kpeter@66
   604
/// \brief Macro for assertions with customizable message
kpeter@66
   605
///
kpeter@66
   606
/// Macro for assertions with customizable message.
kpeter@66
   607
///
kpeter@66
   608
/// The assertions are disabled in the default behaviour. You can
kpeter@66
   609
/// enable the assertions with the
kpeter@66
   610
/// \code
kpeter@66
   611
/// #define LEMON_ENABLE_ASSERTS
kpeter@66
   612
/// \endcode
kpeter@66
   613
/// Then an assert
kpeter@66
   614
/// provides a log on the standard error about the assertion and aborts
kpeter@66
   615
/// the program if LEMON_ASSERT_DO_ABORT is also defined (otherwise the
kpeter@66
   616
/// program keeps on running).
kpeter@66
   617
/// By defining LEMON_ASSERT_FAILURE or
kpeter@66
   618
/// LEMON_ASSERT_EXCEPTION, you can set other behaviour to the
kpeter@66
   619
/// assertions. In case LEMON_ASSERT_FAILURE is given, LEMON_ASSERT
kpeter@66
   620
/// will always throw an \c AssertionFailedError exception with
kpeter@66
   621
/// the \c msg error message. By using
kpeter@66
   622
/// LEMON_ASSERT_EXCEPTION, one can define an arbitrary exception to be thrown.
kpeter@66
   623
///
kpeter@66
   624
/// The LEMON_ASSERT macro should be called with the \c exp parameter
kpeter@66
   625
/// which should be an expression convertible to bool. If the given
kpeter@66
   626
/// parameter is false the assertion is raised and one of the assertion
kpeter@66
   627
/// behaviour will be activated. The \c msg should be either a const
kpeter@66
   628
/// char* message or an exception. When the \c msg is an exception the
kpeter@66
   629
/// \ref lemon::Exception::what() "what()" function is called to retrieve and
kpeter@66
   630
/// display the error message.
kpeter@66
   631
///
kpeter@66
   632
/// \todo We should provide some way to reset to the default behaviour,
kpeter@66
   633
/// shouldn't we?
kpeter@66
   634
///
kpeter@66
   635
/// \todo This whole 'assert' business should be placed in a separate
kpeter@66
   636
/// include file. The boost assert is not guarded by header sentries
kpeter@66
   637
/// which may help to change the behaviour of the assertions in
kpeter@66
   638
/// the files.
kpeter@66
   639
///
kpeter@66
   640
/// \todo __PRETTY_FUNCTION__ should be replaced by something
kpeter@66
   641
/// compiler-independent, like BOOST_CURRENT_FUNCTION
kpeter@66
   642
kpeter@66
   643
#  define LEMON_ASSERT(exp, msg)                 \
kpeter@66
   644
     (static_cast<void> (!!(exp) ? 0 : (         \
kpeter@66
   645
       LEMON_ASSERT_HANDLER(__FILE__, __LINE__,  \
kpeter@66
   646
                            __PRETTY_FUNCTION__, \
kpeter@66
   647
                            msg, #exp, LEMON_ASSERT_DO_ABORT), 0)))
kpeter@66
   648
kpeter@66
   649
#else
kpeter@66
   650
#  if defined LEMON_DISABLE_ASSERTS
kpeter@66
   651
kpeter@66
   652
#    define LEMON_ASSERT(exp, msg)  (static_cast<void> (0))
kpeter@66
   653
kpeter@66
   654
#  else
kpeter@66
   655
#    define LEMON_ASSERT(exp, msg)                 \
kpeter@66
   656
       (static_cast<void> (!!(exp) ? 0 : (         \
kpeter@66
   657
         LEMON_ASSERT_HANDLER(__FILE__, __LINE__,  \
kpeter@66
   658
                              __PRETTY_FUNCTION__, \
kpeter@66
   659
                              msg, #exp, LEMON_ASSERT_DO_ABORT), 0)))
kpeter@66
   660
#  endif
kpeter@66
   661
#endif
kpeter@66
   662
kpeter@66
   663
/**
kpeter@66
   664
 * \brief Macro for mark not yet implemented features.
kpeter@66
   665
 *
kpeter@66
   666
 * \todo Is this the right place for this? It should be used only in
kpeter@66
   667
 * modules under development.
kpeter@66
   668
 *
kpeter@66
   669
 * \todo __PRETTY_FUNCTION__ should be replaced by something
kpeter@66
   670
 * compiler-independent, like BOOST_CURRENT_FUNCTION
kpeter@66
   671
 */
kpeter@66
   672
kpeter@66
   673
#define LEMON_FIXME(msg) \
kpeter@66
   674
    (LEMON_ASSERT_HANDLER(__FILE__, __LINE__, __PRETTY_FUNCTION__, \
kpeter@66
   675
			  "FIXME: " msg))