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# vigra/error.hxx

    00001 /************************************************************************/
    00002 /*                                                                      */
    00003 /*               Copyright 1998-2002 by Ullrich Koethe                  */
    00004 /*       Cognitive Systems Group, University of Hamburg, Germany        */
    00005 /*                                                                      */
    00006 /*    This file is part of the VIGRA computer vision library.           */
    00007 /*    ( Version 1.6.0, Aug 13 2008 )                                    */
    00008 /*    The VIGRA Website is                                              */
    00009 /*        http://kogs-www.informatik.uni-hamburg.de/~koethe/vigra/      */
    00010 /*    Please direct questions, bug reports, and contributions to        */
    00011 /*        ullrich.koethe@iwr.uni-heidelberg.de    or                    */
    00012 /*        vigra@informatik.uni-hamburg.de                               */
    00013 /*                                                                      */
    00014 /*    Permission is hereby granted, free of charge, to any person       */
    00015 /*    obtaining a copy of this software and associated documentation    */
    00016 /*    files (the "Software"), to deal in the Software without           */
    00017 /*    restriction, including without limitation the rights to use,      */
    00018 /*    copy, modify, merge, publish, distribute, sublicense, and/or      */
    00019 /*    sell copies of the Software, and to permit persons to whom the    */
    00020 /*    Software is furnished to do so, subject to the following          */
    00021 /*    conditions:                                                       */
    00022 /*                                                                      */
    00023 /*    The above copyright notice and this permission notice shall be    */
    00024 /*    included in all copies or substantial portions of the             */
    00025 /*    Software.                                                         */
    00026 /*                                                                      */
    00027 /*    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND    */
    00028 /*    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES   */
    00029 /*    OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND          */
    00030 /*    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT       */
    00031 /*    HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,      */
    00032 /*    WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING      */
    00033 /*    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR     */
    00034 /*    OTHER DEALINGS IN THE SOFTWARE.                                   */
    00035 /*                                                                      */
    00036 /************************************************************************/
    00037
    00038
    00039 #ifndef VIGRA_ERROR_HXX
    00040 #define VIGRA_ERROR_HXX
    00041
    00042 #include <stdexcept>
    00043 #include <stdio.h>
    00044 #include <string>
    00045 #include "config.hxx"
    00046
    00047 /*! \page ErrorReporting Error Reporting
    00048     Exceptions and assertions provided by VIGRA
    00049
    00050     <b>\#include</b> <<a href="error_8hxx-source.html">vigra/error.hxx</a>>
    00051
    00052     VIGRA defines the following exception classes:
    00053
    00054     \code
    00055     namespace vigra {
    00056         class ContractViolation : public std::exception;
    00057         class PreconditionViolation : public ContractViolation;
    00058         class PostconditionViolation : public ContractViolation;
    00059         class InvariantViolation : public ContractViolation;
    00060     }
    00061     \endcode
    00062
    00063     The following associated macros throw the corresponding exception if
    00064     their PREDICATE evaluates to '<TT>false</TT>':
    00065
    00066     \code
    00067     vigra_precondition(PREDICATE, MESSAGE);
    00068     vigra_postcondition(PREDICATE, MESSAGE);
    00069     vigra_invariant(PREDICATE, MESSAGE);
    00070     \endcode
    00071
    00072     The MESSAGE is passed to the exception and can be retrieved via
    00073     the overloaded member function '<TT>exception.what()</TT>'. If the compiler
    00074     flag '<TT>NDEBUG</TT>' is <em>not</em> defined, the file name and line number of
    00075     the error are automatically included in the message. The macro
    00076
    00077     \code
    00078     vigra_assert(PREDICATE, MESSAGE);
    00079     \endcode
    00080
    00081     is identical to <tt>vigra_precondition()</tt> except that it is completely removed
    00082     when '<TT>NDEBUG</TT>' is defined. This is useful for test that are only needed during
    00083     debugging, such as array index bound checking. The following macro
    00084
    00085     \code
    00086     vigra_fail(MESSAGE);
    00087     \endcode
    00088
    00089     unconditionally throws a '<TT>std::runtime_error</TT>' constructed from the message
    00090     (along with file name and line number, if NDEBUG is not set).
    00091
    00092     <b> Usage:</b>
    00093
    00094     Include-File:
    00095     <<a href="error_8hxx-source.html">vigra/error.hxx</a>>
    00096     <p>
    00097     Namespace: vigra (except for the macros, of course)
    00098
    00099     \code
    00100     int main(int argc, char ** argv)
    00101     {
    00102         try
    00103         {
    00104             const char* input_file_name = argv[1];
    00105
    00106             // read input image
    00107             vigra::ImageImportInfo info(input_file_name);
    00108
    00109             // fail if input image is not grayscale
    00110             vigra_precondition(info.isGrayscale(), "Input image must be grayscale");
    00111
    00112             ...// process image
    00113         }
    00114         catch (std::exception & e)
    00115         {
    00116             std::cerr << e.what() << std::endl; // print message
    00117             return 1;
    00118         }
    00119
    00120         return 0;
    00121     }
    00122     \endcode
    00123 **/
    00124
    00125 namespace vigra {
    00126
    00127 class ContractViolation : public StdException
    00128 {
    00129   public:
    00130     ContractViolation(char const * prefix, char const * message,
    00131                       char const * file, int line)
    00132     {
    00133         sprintf(what_, "\n%.30s\n%.900s\n(%.100s:%d)\n", prefix, message, file, line);
    00134     }
    00135
    00136     ContractViolation(char const * prefix, char const * message)
    00137     {
    00138         sprintf(what_, "\n%.30s\n%.900s\n", prefix, message);
    00139     }
    00140
    00141     virtual const char * what() const throw()
    00142     {
    00143         return what_;
    00144     }
    00145
    00146   private:
    00147     enum { bufsize_ = 1100 };
    00148     char what_[bufsize_];
    00149 };
    00150
    00151 class PreconditionViolation : public ContractViolation
    00152 {
    00153   public:
    00154     PreconditionViolation(char const * message, const char * file, int line)
    00155     : ContractViolation("Precondition violation!", message, file, line)
    00156     {}
    00157
    00158     PreconditionViolation(char const * message)
    00159     : ContractViolation("Precondition violation!", message)
    00160     {}
    00161 };
    00162
    00163 class PostconditionViolation : public ContractViolation
    00164 {
    00165   public:
    00166     PostconditionViolation(char const * message, const char * file, int line)
    00167     : ContractViolation("Postcondition violation!", message, file, line)
    00168     {}
    00169
    00170     PostconditionViolation(char const * message)
    00171     : ContractViolation("Postcondition violation!", message)
    00172     {}
    00173 };
    00174
    00175 class InvariantViolation : public ContractViolation
    00176 {
    00177   public:
    00178     InvariantViolation(char const * message, const char * file, int line)
    00179     : ContractViolation("Invariant violation!", message, file, line)
    00180     {}
    00181
    00182     InvariantViolation(char const * message)
    00183     : ContractViolation("Invariant violation!", message)
    00184     {}
    00185 };
    00186
    00187 #ifndef NDEBUG
    00188
    00189 inline
    00190 void throw_invariant_error(bool predicate, char const * message, char const * file, int line)
    00191 {
    00192     if(!predicate)
    00193        throw vigra::InvariantViolation(message, file, line);
    00194 }
    00195
    00196 inline
    00197 void throw_invariant_error(bool predicate, std::string message, char const * file, int line)
    00198 {
    00199     if(!predicate)
    00200        throw vigra::InvariantViolation(message.c_str(), file, line);
    00201 }
    00202
    00203 inline
    00204 void throw_precondition_error(bool predicate, char const * message, char const * file, int line)
    00205 {
    00206     if(!predicate)
    00207        throw vigra::PreconditionViolation(message, file, line);
    00208 }
    00209
    00210 inline
    00211 void throw_precondition_error(bool predicate, std::string message, char const * file, int line)
    00212 {
    00213     if(!predicate)
    00214        throw vigra::PreconditionViolation(message.c_str(), file, line);
    00215 }
    00216
    00217 inline
    00218 void throw_postcondition_error(bool predicate, char const * message, char const * file, int line)
    00219 {
    00220     if(!predicate)
    00221        throw vigra::PostconditionViolation(message, file, line);
    00222 }
    00223
    00224 inline
    00225 void throw_postcondition_error(bool predicate, std::string message, char const * file, int line)
    00226 {
    00227     if(!predicate)
    00228        throw vigra::PostconditionViolation(message.c_str(), file, line);
    00229 }
    00230
    00231 inline
    00232 void throw_runtime_error(char const * message, char const * file, int line)
    00233 {
    00234     char what_[1100];
    00235     sprintf(what_, "\n%.900s\n(%.100s:%d)\n", message, file, line);
    00236     throw std::runtime_error(what_);
    00237 }
    00238
    00239 inline
    00240 void throw_runtime_error(std::string message, char const * file, int line)
    00241 {
    00242     char what_[1100];
    00243     sprintf(what_, "\n%.900s\n(%.100s:%d)\n", message.c_str(), file, line);
    00244     throw std::runtime_error(what_);
    00245 }
    00246
    00247 #define vigra_precondition(PREDICATE, MESSAGE) vigra::throw_precondition_error((PREDICATE), MESSAGE, __FILE__, __LINE__)
    00248
    00249 #define vigra_assert(PREDICATE, MESSAGE) vigra_precondition(PREDICATE, MESSAGE)
    00250
    00251 #define vigra_postcondition(PREDICATE, MESSAGE) vigra::throw_postcondition_error((PREDICATE), MESSAGE, __FILE__, __LINE__)
    00252
    00253 #define vigra_invariant(PREDICATE, MESSAGE) vigra::throw_invariant_error((PREDICATE), MESSAGE, __FILE__, __LINE__)
    00254
    00255 #define vigra_fail(MESSAGE) vigra::throw_runtime_error(MESSAGE, __FILE__, __LINE__)
    00256
    00257 #else // NDEBUG
    00258
    00259 inline
    00260 void throw_invariant_error(bool predicate, char const * message)
    00261 {
    00262     if(!predicate)
    00263        throw vigra::InvariantViolation(message);
    00264 }
    00265
    00266 inline
    00267 void throw_precondition_error(bool predicate, char const * message)
    00268 {
    00269     if(!predicate)
    00270        throw vigra::PreconditionViolation(message);
    00271 }
    00272
    00273 inline
    00274 void throw_postcondition_error(bool predicate, char const * message)
    00275 {
    00276     if(!predicate)
    00277        throw vigra::PostconditionViolation(message);
    00278 }
    00279
    00280 inline
    00281 void throw_invariant_error(bool predicate, std::string message)
    00282 {
    00283     if(!predicate)
    00284        throw vigra::InvariantViolation(message.c_str());
    00285 }
    00286
    00287 inline
    00288 void throw_precondition_error(bool predicate, std::string message)
    00289 {
    00290     if(!predicate)
    00291        throw vigra::PreconditionViolation(message.c_str());
    00292 }
    00293
    00294 inline
    00295 void throw_postcondition_error(bool predicate, std::string message)
    00296 {
    00297     if(!predicate)
    00298        throw vigra::PostconditionViolation(message.c_str());
    00299 }
    00300
    00301 #define vigra_precondition(PREDICATE, MESSAGE) vigra::throw_precondition_error((PREDICATE), MESSAGE)
    00302
    00303 #define vigra_assert(PREDICATE, MESSAGE)
    00304
    00305 #define vigra_postcondition(PREDICATE, MESSAGE) vigra::throw_postcondition_error((PREDICATE), MESSAGE)
    00306
    00307 #define vigra_invariant(PREDICATE, MESSAGE) vigra::throw_invariant_error((PREDICATE), MESSAGE)
    00308
    00309 #define vigra_fail(MESSAGE) throw std::runtime_error(MESSAGE)
    00310
    00311 #endif // NDEBUG
    00312
    00313 } // namespace vigra
    00314
    00315 #endif // VIGRA_ERROR_HXX

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de) Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany | html generated using doxygen and Python VIGRA 1.6.0 (13 Aug 2008)