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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// <map>
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// template <class Key, class T, class Compare, class Allocator, class Predicate>
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//   typename multimap<Key, T, Compare, Allocator>::size_type
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//   erase_if(multimap<Key, T, Compare, Allocator>& c, Predicate pred);
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#include <map>
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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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using Init = std::initializer_list<int>;
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template <typename M>
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M make (Init vals)
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{
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    M ret;
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    for (int v : vals)
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        ret.emplace(static_cast<typename M::key_type>(v), static_cast<typename M::mapped_type>(v + 10));
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    return ret;
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}
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template <typename M, typename Pred>
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void test0(Init vals, Pred p, Init expected, std::size_t expected_erased_count) {
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  M s = make<M>(vals);
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  ASSERT_SAME_TYPE(typename M::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 == make<M>(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.first == 1;};
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    auto is2 = [](auto v) { return v.first == 2;};
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    auto is3 = [](auto v) { return v.first == 3;};
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    auto is4 = [](auto v) { return v.first == 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, {}, 0);
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    test0<S>({1}, is1, {}, 1);
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    test0<S>({1}, is2, {1}, 0);
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    test0<S>({1, 2}, is1, {2}, 1);
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    test0<S>({1, 2}, is2, {1}, 1);
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    test0<S>({1, 2}, is3, {1, 2}, 0);
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    test0<S>({1, 1}, is1, {}, 2);
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    test0<S>({1, 1}, is3, {1, 1}, 0);
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    test0<S>({1, 2, 3}, is1, {2, 3}, 1);
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    test0<S>({1, 2, 3}, is2, {1, 3}, 1);
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    test0<S>({1, 2, 3}, is3, {1, 2}, 1);
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    test0<S>({1, 2, 3}, is4, {1, 2, 3}, 0);
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    test0<S>({1, 1, 1}, is1, {}, 3);
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    test0<S>({1, 1, 1}, is2, {1, 1, 1}, 0);
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    test0<S>({1, 1, 2}, is1, {2}, 2);
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    test0<S>({1, 1, 2}, is2, {1, 1}, 1);
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    test0<S>({1, 1, 2}, is3, {1, 1, 2}, 0);
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    test0<S>({1, 2, 2}, is1, {2, 2}, 1);
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    test0<S>({1, 2, 2}, is2, {1}, 2);
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    test0<S>({1, 2, 2}, is3, {1, 2, 2}, 0);
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    test0<S>({1, 2, 3}, True, {}, 3);
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    test0<S>({1, 2, 3}, False, {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::multimap<int, int>>();
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    test<std::multimap<int, int, std::less<int>, min_allocator<std::pair<const int, int>>>> ();
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    test<std::multimap<int, int, std::less<int>, test_allocator<std::pair<const int, int>>>> ();
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    test<std::multimap<long, short>>();
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    test<std::multimap<short, double>>();
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  return 0;
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}
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