include/assert.h

   1 /* Copyright (C) 1991,1992,1994-2001,2003,2004 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 /*
  19  *      ISO C99 Standard: 7.2 Diagnostics       <assert.h>
  20  */
  21
  22 #ifdef  _ASSERT_H
  23
  24 # undef _ASSERT_H
  25 # undef assert
  26 # undef __ASSERT_VOID_CAST
  27
  28 #endif /* assert.h      */
  29
  30 #define _ASSERT_H       1
  31 #include <features.h>
  32
  33 #if defined __cplusplus && __GNUC_PREREQ (2,95)
  34 # define __ASSERT_VOID_CAST static_cast<void>
  35 #else
  36 # define __ASSERT_VOID_CAST (void)
  37 #endif
  38
  39 /* void assert (int expression);
  40
  41    If NDEBUG is defined, do nothing.
  42    If not, and EXPRESSION is zero, print an error message and abort.  */
  43
  44 #ifdef  NDEBUG
  45
  46 # define assert(expr)           (__ASSERT_VOID_CAST (0))
  47
  48 #else /* Not NDEBUG.  */
  49
  50 __BEGIN_DECLS
  51
  52 /* This prints an "Assertion failed" message and aborts.  */
  53 extern void __assert(const char *, const char *, unsigned int, const char *)
  54         __THROW __attribute__ ((__noreturn__));
  55 libc_hidden_proto(__assert)
  56
  57 __END_DECLS
  58
  59 # define assert(expr) \
  60   (__ASSERT_VOID_CAST ((expr) ? 0 :                                                             \
  61                        (__assert (__STRING(expr), __FILE__, __LINE__, __ASSERT_FUNCTION), 0)))
  62
  63 /* Version 2.4 and later of GCC define a magical variable `__PRETTY_FUNCTION__'
  64    which contains the name of the function currently being defined.
  65    This is broken in G++ before version 2.6.
  66    C9x has a similar variable called __func__, but prefer the GCC one since
  67    it demangles C++ function names.  */
  68 # if defined __cplusplus ? __GNUC_PREREQ (2, 6) : __GNUC_PREREQ (2, 4)
  69 #   define __ASSERT_FUNCTION    __PRETTY_FUNCTION__
  70 # else
  71 #  if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
  72 #   define __ASSERT_FUNCTION    __func__
  73 #  else
  74 #   define __ASSERT_FUNCTION    ((const char *) 0)
  75 #  endif
  76 # endif
  77
  78 #endif /* NDEBUG.  */