1// -*- C++ -*-
2
3// Copyright (C) 2005, 2006, 2009 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library.  This library is free
6// software; you can redistribute it and/or modify it under the terms
7// of the GNU General Public License as published by the Free Software
8// Foundation; either version 3, or (at your option) any later
9// version.
10
11// This library is distributed in the hope that it will be useful, but
12// WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14// General Public License for more details.
15
16// You should have received a copy of the GNU General Public License
17// along with this library; see the file COPYING3.  If not see
18// <http://www.gnu.org/licenses/>.
19
20
21// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
22
23// Permission to use, copy, modify, sell, and distribute this software
24// is hereby granted without fee, provided that the above copyright
25// notice appears in all copies, and that both that copyright notice
26// and this permission notice appear in supporting documentation. None
27// of the above authors, nor IBM Haifa Research Laboratories, make any
28// representation about the suitability of this software for any
29// purpose. It is provided "as is" without express or implied
30// warranty.
31
32/**
33 * @file erase_if_fn.hpp
34 * Contains traits for a random regression test
35 *    for a specific container type.
36 */
37
38#ifndef PB_DS_REGRESSION_TEST_ERASE_IF_FN_HPP
39#define PB_DS_REGRESSION_TEST_ERASE_IF_FN_HPP
40
41#include <functional>
42
43namespace __gnu_pbds
44{
45  namespace test
46  {
47    namespace detail
48    {
49      template<typename T>
50      struct regression_test_erase_if_fn
51      : public std::unary_function<T, bool>
52      {
53      private:
54	typedef const T&  const_reference;
55
56      public:
57	bool
58        operator()(const_reference r_t) const
59	{
60	  return (r_t.length() == 0 ||
61		  static_cast<size_t>(*((r_t).begin())) % 2 == 1);
62	}
63      };
64
65      template<typename Hd, class Tl>
66      struct regression_test_erase_if_fn<std::pair<Hd, Tl> >
67      : public std::unary_function<std::pair<Hd, Tl>, bool>
68      {
69      private:
70	typedef const std::pair<Hd, Tl>&  const_reference;
71	typedef regression_test_erase_if_fn<Hd> hd_erase_if_fn;
72	typedef regression_test_erase_if_fn<Tl> tl_erase_if_fn;
73
74      public:
75	bool
76        operator()(const_reference r_t) const
77	{
78	  return (hd_erase_if_fn()(r_t.first) && tl_erase_if_fn()(r_t.second));
79	}
80      };
81    } // namespace detail
82  } // namespace test
83} // namespace __gnu_pbds
84
85#endif
86