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

   1 // { dg-options "-std=gnu++2a" }
   2 // { dg-do run { target c++2a } }
   3
   4 // Copyright (C) 2018-2020 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 <list>
  22 #include <testsuite_hooks.h>
  23
  24 #ifndef __cpp_lib_erase_if
  25 # error "Feature-test macro for erase_if missing"
  26 #elif __cpp_lib_erase_if < 202002
  27 # error "Feature-test macro for erase_if has wrong value"
  28 #endif
  29
  30 void
  31 test01()
  32 {
  33   auto is_odd = [](const int i) { return i % 2 != 0; };
  34
  35   std::list<int> l{ 10, 11, 12, 14, 15, 17, 18, 19 };
  36   std::erase_if(l, is_odd);
  37   std::list<int> t{ 10, 12, 14, 18 };
  38   VERIFY( l == t );
  39 }
  40
  41 void
  42 test02()
  43 {
  44   std::list<int> l{ 0, 11, 0, 0, 22, 33, 0, 0, 44, 0 };
  45   auto num = std::erase(l, 0);
  46   std::list<int> t{ 11, 22, 33, 44 };
  47   VERIFY( l == t );
  48   VERIFY( num == 6 );
  49   num = std::erase(l, 55);
  50   VERIFY( l == t );
  51   VERIFY( num == 0 );
  52 }
  53
  54 int
  55 main()
  56 {
  57   test01();
  58   test02();
  59
  60   return 0;
  61 }