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// { dg-options "-std=gnu++2a" }
// { dg-do run { target c++2a } }
// Copyright (C) 2018-2022 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
#include <unordered_map>
#include <string>
#include <testsuite_hooks.h>
#ifndef __cpp_lib_erase_if
# error "Feature-test macro for erase_if missing in <unordered_map>"
#elif __cpp_lib_erase_if < 202002
# error "Feature-test macro for erase_if has wrong value in <unordered_map>"
#endif
auto is_odd_pair = [](const std::pair<const int, std::string>& p)
{
return p.first % 2 != 0;
};
void
test01()
{
std::unordered_map<int, std::string> um{ { 10, "A" }, { 11, "B" },
{ 12, "C" }, { 14, "D" },
{ 15, "E" }, { 17, "F" },
{ 18, "G" }, { 19, "H" } };
auto num = std::erase_if(um, is_odd_pair);
std::unordered_map<int, std::string> t{ { 10, "A" }, { 12, "C" },
{ 14, "D" }, { 18, "G" } };
VERIFY( um == t );
VERIFY( num == 4 );
}
void
test02()
{
std::unordered_multimap<int, std::string> umm{ { 20, "S" }, { 21, "T" },
{ 22, "U" }, { 22, "V" },
{ 23, "W" }, { 23, "X" },
{ 24, "Y" }, { 25, "Z" } };
auto num = std::erase_if(umm, is_odd_pair);
std::unordered_multimap<int, std::string> t{ { 20, "S" }, { 22, "U" },
{ 22, "V" }, { 24, "Y" } };
VERIFY( umm == t );
VERIFY( num == 4 );
}
int
main()
{
test01();
test02();
return 0;
}