/* -*- 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