libstdc++-v3/testsuite/util/regression/trait/erase_if_fn.hpp

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005-2022 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
  43 namespace __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