libstdc++-v3/libsupc++/tinfo.cc

   1 // Methods for type_info for -*- C++ -*- Run Time Type Identification.
   2 // Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
   3 // 2003, 2004, 2005, 2006, 2007, 2009, 2012
   4 // Free Software Foundation
   5 //
   6 // This file is part of GCC.
   7 //
   8 // GCC is free software; you can redistribute it and/or modify
   9 // it under the terms of the GNU General Public License as published by
  10 // the Free Software Foundation; either version 3, or (at your option)
  11 // any later version.
  12
  13 // GCC is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // Under Section 7 of GPL version 3, you are granted additional
  19 // permissions described in the GCC Runtime Library Exception, version
  20 // 3.1, as published by the Free Software Foundation.
  21
  22 // You should have received a copy of the GNU General Public License and
  23 // a copy of the GCC Runtime Library Exception along with this program;
  24 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25 // <http://www.gnu.org/licenses/>.
  26
  27 #include <bits/c++config.h>
  28 #include <cstddef>
  29 #include "tinfo.h"
  30
  31 std::type_info::
  32 ~type_info ()
  33 { }
  34
  35 #if !__GXX_TYPEINFO_EQUALITY_INLINE
  36
  37 // We can't rely on common symbols being shared between shared objects.
  38 bool std::type_info::
  39 operator== (const std::type_info& arg) const _GLIBCXX_NOEXCEPT
  40 {
  41 #if __GXX_MERGED_TYPEINFO_NAMES
  42   return name () == arg.name ();
  43 #else
  44   /* The name() method will strip any leading '*' prefix. Therefore
  45      take care to look at __name rather than name() when looking for
  46      the "pointer" prefix.  */
  47   return (&arg == this)
  48     || (__name[0] != '*' && (__builtin_strcmp (name (), arg.name ()) == 0));
  49 #endif
  50 }
  51
  52 #endif
  53
  54 namespace std {
  55
  56 // return true if this is a type_info for a pointer type
  57 bool type_info::
  58 __is_pointer_p () const
  59 {
  60   return false;
  61 }
  62
  63 // return true if this is a type_info for a function type
  64 bool type_info::
  65 __is_function_p () const
  66 {
  67   return false;
  68 }
  69
  70 // try and catch a thrown object.
  71 bool type_info::
  72 __do_catch (const type_info *thr_type, void **, unsigned) const
  73 {
  74   return *this == *thr_type;
  75 }
  76
  77 // upcast from this type to the target. __class_type_info will override
  78 bool type_info::
  79 __do_upcast (const abi::__class_type_info *, void **) const
  80 {
  81   return false;
  82 }
  83
  84 }