libstdc++-v3/testsuite/23_containers/set/erasure.cc

   1 // { dg-options "-std=gnu++2a" }
   2 // { dg-do run { target c++2a } }
   3
   4 // Copyright (C) 2018-2021 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 3, 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 COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <set>
  22 #include <testsuite_hooks.h>
  23
  24 #ifndef __cpp_lib_erase_if
  25 # error "Feature-test macro for erase_if missing in <set>"
  26 #elif __cpp_lib_erase_if < 202002
  27 # error "Feature-test macro for erase_if has wrong value in <set>"
  28 #endif
  29
  30 auto is_odd = [](const int i) { return i % 2 != 0; };
  31
  32 void
  33 test01()
  34 {
  35   std::set<int> s{ 10, 11, 12, 14, 15, 17, 18, 19 };
  36   auto num = std::erase_if(s, is_odd);
  37   std::set<int> t{ 10, 12, 14, 18 };
  38   VERIFY( s == t );
  39   VERIFY( num == 4 );
  40 }
  41
  42 void
  43 test02()
  44 {
  45   std::multiset<int> ms{ 20, 21, 22, 22, 23, 23, 24, 25 };
  46   auto num = std::erase_if(ms, is_odd);
  47   std::multiset<int> t{ 20, 22, 22, 24 };
  48   VERIFY( ms == t );
  49   VERIFY( num == 4 );
  50 }
  51
  52 int
  53 main()
  54 {
  55   test01();
  56   test02();
  57
  58   return 0;
  59 }