/* -*- mode: C++; indent-tabs-mode: nil; -*-

  *

  * This file is a part of LEMON, a generic C++ optimization library.

  *

  * Copyright (C) 2003-2008

  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

  * (Egervary Research Group on Combinatorial Optimization, 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_ASSERT_H

 #define LEMON_ASSERT_H

 /// \ingroup exceptions

 /// \file

 /// \brief Extended assertion handling

 #include <lemon/error.h>

 namespace lemon {

   inline void assert_fail_abort(const char *file, int line,

                                 const char *function, const char* message,

                                 const char *assertion)

   {

     std::cerr << file << ":" << line << ": ";

     if (function)

       std::cerr << function << ": ";

     std::cerr << message;

     if (assertion)

       std::cerr << " (assertion '" << assertion << "' failed)";

     std::cerr << std::endl;

     std::abort();

   }

   namespace _assert_bits {

     inline const char* cstringify(const std::string& str) {

       return str.c_str();

     }

     inline const char* cstringify(const char* str) {

       return str;

     }

   }

 }

 #endif // LEMON_ASSERT_H

 #undef LEMON_ASSERT

 #undef LEMON_DEBUG

 #if (defined(LEMON_ASSERT_ABORT) ? 1 : 0) +               \

   (defined(LEMON_ASSERT_CUSTOM) ? 1 : 0) > 1

 #error "LEMON assertion system is not set properly"

 #endif

 #if ((defined(LEMON_ASSERT_ABORT) ? 1 : 0) +            \

      (defined(LEMON_ASSERT_CUSTOM) ? 1 : 0) == 1 ||     \

      defined(LEMON_ENABLE_ASSERTS)) &&                  \

   (defined(LEMON_DISABLE_ASSERTS) ||                    \

    defined(NDEBUG))

 #error "LEMON assertion system is not set properly"

 #endif

 #if defined LEMON_ASSERT_ABORT

 #  undef LEMON_ASSERT_HANDLER

 #  define LEMON_ASSERT_HANDLER ::lemon::assert_fail_abort

 #elif defined LEMON_ASSERT_CUSTOM

 #  undef LEMON_ASSERT_HANDLER

 #  ifndef LEMON_CUSTOM_ASSERT_HANDLER

 #    error "LEMON_CUSTOM_ASSERT_HANDLER is not set"

 #  endif

 #  define LEMON_ASSERT_HANDLER LEMON_CUSTOM_ASSERT_HANDLER

 #elif defined LEMON_DISABLE_ASSERTS

 #  undef LEMON_ASSERT_HANDLER

 #elif defined NDEBUG

 #  undef LEMON_ASSERT_HANDLER

 #else

 #  define LEMON_ASSERT_HANDLER ::lemon::assert_fail_abort

 #endif

 #ifndef LEMON_FUNCTION_NAME

 #  if defined __GNUC__

 #    define LEMON_FUNCTION_NAME (__PRETTY_FUNCTION__)

 #  elif defined _MSC_VER

 #    define LEMON_FUNCTION_NAME (__FUNCSIG__)

 #  elif __STDC_VERSION__ >= 199901L

 #    define LEMON_FUNCTION_NAME (__func__)

 #  else

 #    define LEMON_FUNCTION_NAME ("<unknown>")

 #  endif

 #endif

 #ifdef DOXYGEN

 /// \ingroup exceptions

 ///

 /// \brief Macro for assertion with customizable message

 ///

 /// Macro for assertion with customizable message.  

 /// \param exp An expression that must be convertible to \c bool.  If it is \c

 /// false, then an assertion is raised. The concrete behaviour depends on the

 /// settings of the assertion system.

 /// \param msg A <tt>const char*</tt> parameter, which can be used to provide

 /// information about the circumstances of the failed assertion.

 ///

 /// The assertions are enabled in the default behaviour.

 /// You can disable them with the following code:

 /// \code

 /// #define LEMON_DISABLE_ASSERTS

 /// \endcode

 /// or with compilation parameters:

 /// \code

 /// g++ -DLEMON_DISABLE_ASSERTS

 /// make CXXFLAGS='-DLEMON_DISABLE_ASSERTS'

 /// \endcode

 /// The checking is also disabled when the standard macro \c NDEBUG is defined.

 ///

 /// As a default behaviour the failed assertion prints a short log message to

 /// the standard error and aborts the execution.

 ///

 /// However, the following modes can be used in the assertion system:

 /// - \c LEMON_ASSERT_ABORT The failed assertion prints a short log message to

 ///   the standard error and aborts the program. It is the default behaviour.

 /// - \c LEMON_ASSERT_CUSTOM The user can define own assertion handler

 ///   function.

 ///   \code

 ///     void custom_assert_handler(const char* file, int line,

 ///                                const char* function, const char* message,

 ///                                const char* assertion);

 ///   \endcode

 ///   The name of the function should be defined as the \c

 ///   LEMON_CUSTOM_ASSERT_HANDLER macro name.

 ///   \code

 ///     #define LEMON_CUSTOM_ASSERT_HANDLER custom_assert_handler

 ///   \endcode

 ///   Whenever an assertion is occured, the custom assertion

 ///   handler is called with appropiate parameters.

 ///

 /// The assertion mode can also be changed within one compilation unit.

 /// If the macros are redefined with other settings and the

 /// \ref lemon/assert.h "assert.h" file is reincluded, then the

 /// behaviour is changed appropiately to the new settings.

 #  define LEMON_ASSERT(exp, msg)                                        \

   (static_cast<void> (!!(exp) ? 0 : (                                   \

     LEMON_ASSERT_HANDLER(__FILE__, __LINE__,                            \

                          LEMON_FUNCTION_NAME,                           \

                          ::lemon::_assert_bits::cstringify(msg), #exp), 0)))

 /// \ingroup exceptions

 ///

 /// \brief Macro for internal assertions

 ///

 /// Macro for internal assertions, it is used in the library to check

 /// the consistency of results of algorithms, several pre- and

 /// postconditions and invariants. The checking is disabled by

 /// default, but it can be turned on with the macro \c

 /// LEMON_ENABLE_DEBUG.

 /// \code

 /// #define LEMON_ENABLE_DEBUG

 /// \endcode

 /// or with compilation parameters:

 /// \code

 /// g++ -DLEMON_ENABLE_DEBUG

 /// make CXXFLAGS='-DLEMON_ENABLE_DEBUG'

 /// \endcode

 ///

 /// This macro works like the \c LEMON_ASSERT macro, therefore the

 /// current behaviour depends on the settings of \c LEMON_ASSERT

 /// macro.

 ///

 /// \see LEMON_ASSERT

 #  define LEMON_DEBUG(exp, msg)                                         \

   (static_cast<void> (!!(exp) ? 0 : (                                   \

     LEMON_ASSERT_HANDLER(__FILE__, __LINE__,                            \

                          LEMON_FUNCTION_NAME,                           \

                          ::lemon::_assert_bits::cstringify(msg), #exp), 0)))

 #else

 #  ifndef LEMON_ASSERT_HANDLER

 #    define LEMON_ASSERT(exp, msg)  (static_cast<void>(0))

 #    define LEMON_DEBUG(exp, msg) (static_cast<void>(0))

 #  else

 #    define LEMON_ASSERT(exp, msg)                                      \

        (static_cast<void> (!!(exp) ? 0 : (                              \

         LEMON_ASSERT_HANDLER(__FILE__, __LINE__,                        \

                              LEMON_FUNCTION_NAME,                       \

                              ::lemon::_assert_bits::cstringify(msg),    \

                              #exp), 0)))

 #    if LEMON_ENABLE_DEBUG

 #      define LEMON_DEBUG(exp, msg)                                     \

          (static_cast<void> (!!(exp) ? 0 : (                            \

            LEMON_ASSERT_HANDLER(__FILE__, __LINE__,                     \

                                 LEMON_FUNCTION_NAME,                    \

                                 ::lemon::_assert_bits::cstringify(msg), \

                                 #exp), 0)))

 #    else

 #      define LEMON_DEBUG(exp, msg) (static_cast<void>(0))

 #    endif

 #  endif

 #endif