llvm-project

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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// <set>
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// template <class T, class Compare, class Allocator, class Predicate>
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//   typename multiset<T, Compare, Allocator>::size_type
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//   erase_if(multiset<T, Compare, Allocator>& c, Predicate pred);
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#include <set>
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#include "test_macros.h"
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#include "test_allocator.h"
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#include "min_allocator.h"
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template <class S, class Pred>
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void test0(S s, Pred p, S expected, std::size_t expected_erased_count) {
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  ASSERT_SAME_TYPE(typename S::size_type, decltype(std::erase_if(s, p)));
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  assert(expected_erased_count == std::erase_if(s, p));
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  assert(s == expected);
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}
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template <typename S>
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void test()
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{
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    auto is1 = [](auto v) { return v == 1;};
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    auto is2 = [](auto v) { return v == 2;};
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    auto is3 = [](auto v) { return v == 3;};
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    auto is4 = [](auto v) { return v == 4;};
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    auto True  = [](auto) { return true; };
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    auto False = [](auto) { return false; };
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    test0(S(), is1, S(), 0);
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    test0(S({1}), is1, S(), 1);
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    test0(S({1}), is2, S({1}), 0);
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    test0(S({1, 2}), is1, S({2}), 1);
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    test0(S({1, 2}), is2, S({1}), 1);
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    test0(S({1, 2}), is3, S({1, 2}), 0);
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    test0(S({1, 1}), is1, S(), 2);
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    test0(S({1, 1}), is3, S({1, 1}), 0);
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    test0(S({1, 2, 3}), is1, S({2, 3}), 1);
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    test0(S({1, 2, 3}), is2, S({1, 3}), 1);
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    test0(S({1, 2, 3}), is3, S({1, 2}), 1);
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    test0(S({1, 2, 3}), is4, S({1, 2, 3}), 0);
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    test0(S({1, 1, 1}), is1, S(), 3);
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    test0(S({1, 1, 1}), is2, S({1, 1, 1}), 0);
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    test0(S({1, 1, 2}), is1, S({2}), 2);
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    test0(S({1, 1, 2}), is2, S({1, 1}), 1);
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    test0(S({1, 1, 2}), is3, S({1, 1, 2}), 0);
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    test0(S({1, 2, 2}), is1, S({2, 2}), 1);
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    test0(S({1, 2, 2}), is2, S({1}), 2);
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    test0(S({1, 2, 2}), is3, S({1, 2, 2}), 0);
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    test0(S({1, 2, 3}), True, S(), 3);
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    test0(S({1, 2, 3}), False, S({1, 2, 3}), 0);
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}
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int main(int, char**)
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{
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    test<std::multiset<int>>();
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    test<std::multiset<int, std::less<int>, min_allocator<int>>> ();
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    test<std::multiset<int, std::less<int>, test_allocator<int>>> ();
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    test<std::multiset<long>>();
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    test<std::multiset<double>>();
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  return 0;
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}
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