libstdc++-v3/testsuite/ext/pb_ds/example/hash_find_neg.cc

   1 // { dg-do compile }
   2 // -*- C++ -*-
   3
   4 // Copyright (C) 2005, 2006 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 terms
   8 // of the GNU General Public License as published by the Free Software
   9 // Foundation; either version 2, or (at your option) any later
  10 // version.
  11
  12 // This library is distributed in the hope that it will be useful, but
  13 // WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 // General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License
  18 // along with this library; see the file COPYING.  If not, write to
  19 // the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  20 // MA 02111-1307, USA.
  21
  22 // As a special exception, you may use this file as part of a free
  23 // software library without restriction.  Specifically, if other files
  24 // instantiate templates or use macros or inline functions from this
  25 // file, or you compile this file and link it with other files to
  26 // produce an executable, this file does not by itself cause the
  27 // resulting executable to be covered by the GNU General Public
  28 // License.  This exception does not however invalidate any other
  29 // reasons why the executable file might be covered by the GNU General
  30 // Public License.
  31
  32 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
  33
  34 // Permission to use, copy, modify, sell, and distribute this software
  35 // is hereby granted without fee, provided that the above copyright
  36 // notice appears in all copies, and that both that copyright notice
  37 // and this permission notice appear in supporting documentation. None
  38 // of the above authors, nor IBM Haifa Research Laboratories, make any
  39 // representation about the suitability of this software for any
  40 // purpose. It is provided "as is" without express or implied
  41 // warranty.
  42
  43 /**
  44  * @file hash_bad_find_example.cpp
  45  * An example showing how *not* to use unordered containers.
  46  */
  47
  48 /**
  49  * This non-compiling example shows wrong use of unordered
  50  * associative-containers. These types of containers have distinct
  51  * point-type and range-type iterator types.
  52  **/
  53
  54 #include <utility>
  55 #include <ext/pb_ds/assoc_container.hpp>
  56
  57 using namespace std;
  58 using namespace __gnu_pbds;
  59
  60 int main()
  61 {
  62   // A collision-chaining hash table mapping ints to chars.
  63   typedef cc_hash_table<int, char> map_t;
  64
  65   // A map_t object.
  66   map_t h;
  67
  68   // Insert a value mapping the int 1 to the char 'a'.
  69   h.insert(make_pair(1, 'a'));
  70
  71   // Find the entry of the key '1' the* wrong* way.
  72   // The following line will not compile, since map_t::find returns a
  73   // point-iterator, which, by design, is not convertible to a
  74   // range-iterator.
  75   map_t::iterator it = h.find(1); // { dg-error "conversion from" }
  76
  77   return 0;
  78 }
  79