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
   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 2, 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 // You should have received a copy of the GNU General Public License
  19 // along with GCC; see the file COPYING.  If not, write to
  20 // the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  21 // Boston, MA 02110-1301, USA.
  22
  23 // As a special exception, you may use this file as part of a free software
  24 // library without restriction.  Specifically, if other files instantiate
  25 // templates or use macros or inline functions from this file, or you compile
  26 // this file and link it with other files to produce an executable, this
  27 // file does not by itself cause the resulting executable to be covered by
  28 // the GNU General Public License.  This exception does not however
  29 // invalidate any other reasons why the executable file might be covered by
  30 // the GNU General Public License.
  31
  32 #include <bits/c++config.h>
  33 #include <cstddef>
  34 #include "tinfo.h"
  35
  36 std::type_info::
  37 ~type_info ()
  38 { }
  39
  40 #if !__GXX_TYPEINFO_EQUALITY_INLINE
  41
  42 // We can't rely on common symbols being shared between shared objects.
  43 bool std::type_info::
  44 operator== (const std::type_info& arg) const
  45 {
  46 #if __GXX_MERGED_TYPEINFO_NAMES
  47   return name () == arg.name ();
  48 #else
  49   return (&arg == this) || (__builtin_strcmp (name (), arg.name ()) == 0);
  50 #endif
  51 }
  52
  53 #endif
  54
  55 namespace std {
  56
  57 // return true if this is a type_info for a pointer type
  58 bool type_info::
  59 __is_pointer_p () const
  60 {
  61   return false;
  62 }
  63
  64 // return true if this is a type_info for a function type
  65 bool type_info::
  66 __is_function_p () const
  67 {
  68   return false;
  69 }
  70
  71 // try and catch a thrown object.
  72 bool type_info::
  73 __do_catch (const type_info *thr_type, void **, unsigned) const
  74 {
  75   return *this == *thr_type;
  76 }
  77
  78 // upcast from this type to the target. __class_type_info will override
  79 bool type_info::
  80 __do_upcast (const abi::__class_type_info *, void **) const
  81 {
  82   return false;
  83 }
  84
  85 }