libstdc++-v3/testsuite/23_containers/unordered_set/not_default_constructible_hash_neg.cc

   1 // { dg-do compile }
   2 // { dg-options "-std=c++11" }
   3 // { dg-require-normal-mode "" }
   4
   5 // Copyright (C) 2013 Free Software Foundation, Inc.
   6 //
   7 // This file is part of the GNU ISO C++ Library.  This library is free
   8 // software; you can redistribute it and/or modify it under the
   9 // terms of the GNU General Public License as published by the
  10 // Free Software Foundation; either version 3, or (at your option)
  11 // any later version.
  12
  13 // This library 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 along
  19 // with this library; see the file COPYING3.  If not see
  20 // <http://www.gnu.org/licenses/>.
  21
  22 // { dg-error "default constructible" "" { target *-*-* } 272 }
  23
  24 #include <unordered_set>
  25
  26 namespace
  27 {
  28   struct hash
  29   {
  30     hash(std::size_t seed)
  31       : _M_seed(seed)
  32     { }
  33
  34     std::size_t operator() (int val) const noexcept
  35     { return val ^ _M_seed; }
  36
  37   private:
  38     std::size_t _M_seed;
  39   };
  40 }
  41
  42 void
  43 test01()
  44 {
  45   using traits = std::__detail::_Hashtable_traits<false, true, true>;
  46   using hashtable = std::__uset_hashtable<int, hash,
  47                                           std::equal_to<int>,
  48                                           std::allocator<int>, traits>;
  49
  50   hashtable ht(10, hash(1));
  51 }