old-autovect-branch/libstdc++-v3/testsuite/ext/pb_assoc/example/hash_find_neg.cc

   1 // { dg-do compile }
   2 // -*- C++ -*-
   3
   4 // Copyright (C) 2005 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 2, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING.  If not, write to the Free
  19 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  20 // USA.
  21
  22 // As a special exception, you may use this file as part of a free software
  23 // library without restriction.  Specifically, if other files instantiate
  24 // templates or use macros or inline functions from this file, or you compile
  25 // this file and link it with other files to produce an executable, this
  26 // file does not by itself cause the resulting executable to be covered by
  27 // the GNU General Public License.  This exception does not however
  28 // invalidate any other reasons why the executable file might be covered by
  29 // the GNU General Public License.
  30
  31 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
  32
  33 // Permission to use, copy, modify, sell, and distribute this software
  34 // is hereby granted without fee, provided that the above copyright
  35 // notice appears in all copies, and that both that copyright notice and
  36 // this permission notice appear in supporting documentation. None of
  37 // the above authors, nor IBM Haifa Research Laboratories, make any
  38 // representation about the suitability of this software for any
  39 // purpose. It is provided "as is" without express or implied warranty.
  40
  41 /**
  42  * @file bad_find_example.cpp
  43  * A basic example showing how *not* to use unordered containers.
  44  */
  45
  46 // For cc_hash_assoc_cntnr.
  47 #include <ext/pb_assoc/assoc_cntnr.hpp>
  48 // For pair.
  49 #include <utility>
  50
  51 int
  52 main()
  53 {
  54   /*
  55    * A collision-chaining hash table mapping ints to chars.
  56    */
  57   typedef pb_assoc::cc_hash_assoc_cntnr< int, char> map_t;
  58
  59   // An map_t object.
  60   map_t h;
  61
  62   // Insert a value mapping the int 1 to the char 'a'.
  63   h.insert(std::make_pair(1, 'a'));
  64
  65   /*
  66    * Find the entry of the key '1' the* wrong* way.
  67    * The following line will not compile, since map_t::find
  68    *    returns a find_iterator, which, by design, is not convertible
  69    *    to map_t::iterator.
  70    */
  71   map_t::iterator it = h.find(1); // { dg-error "conversion from" }
  72 }
  73