1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8// UNSUPPORTED: c++03, c++11, c++14, c++17
9
10// <forward_list>
11
12// template <class T, class Allocator, class Predicate>
13// typename forward_list<T, Allocator>::size_type
14// erase_if(forward_list<T, Allocator>& c, Predicate pred); // constexpr since C++26
15
16#include <forward_list>
17
18#include "test_macros.h"
19#include "test_allocator.h"
20#include "min_allocator.h"
21
22template <class S, class Pred>
23TEST_CONSTEXPR_CXX26 void test0(S s, Pred p, S expected, std::size_t expected_erased_count) {
24 ASSERT_SAME_TYPE(typename S::size_type, decltype(std::erase_if(s, p)));
25 assert(expected_erased_count == std::erase_if(s, p));
26 assert(s == expected);
27}
28
29template <typename S>
30TEST_CONSTEXPR_CXX26 void test() {
31 auto is1 = [](auto v) { return v == 1; };
32 auto is2 = [](auto v) { return v == 2; };
33 auto is3 = [](auto v) { return v == 3; };
34 auto is4 = [](auto v) { return v == 4; };
35 auto True = [](auto) { return true; };
36 auto False = [](auto) { return false; };
37
38 test0(S(), is1, S(), 0);
39
40 test0(S({1}), is1, S(), 1);
41 test0(S({1}), is2, S({1}), 0);
42
43 test0(S({1, 2}), is1, S({2}), 1);
44 test0(S({1, 2}), is2, S({1}), 1);
45 test0(S({1, 2}), is3, S({1, 2}), 0);
46 test0(S({1, 1}), is1, S(), 2);
47 test0(S({1, 1}), is3, S({1, 1}), 0);
48
49 test0(S({1, 2, 3}), is1, S({2, 3}), 1);
50 test0(S({1, 2, 3}), is2, S({1, 3}), 1);
51 test0(S({1, 2, 3}), is3, S({1, 2}), 1);
52 test0(S({1, 2, 3}), is4, S({1, 2, 3}), 0);
53
54 test0(S({1, 1, 1}), is1, S(), 3);
55 test0(S({1, 1, 1}), is2, S({1, 1, 1}), 0);
56 test0(S({1, 1, 2}), is1, S({2}), 2);
57 test0(S({1, 1, 2}), is2, S({1, 1}), 1);
58 test0(S({1, 1, 2}), is3, S({1, 1, 2}), 0);
59 test0(S({1, 2, 2}), is1, S({2, 2}), 1);
60 test0(S({1, 2, 2}), is2, S({1}), 2);
61 test0(S({1, 2, 2}), is3, S({1, 2, 2}), 0);
62
63 test0(S({1, 2, 3}), True, S(), 3);
64 test0(S({1, 2, 3}), False, S({1, 2, 3}), 0);
65}
66
67TEST_CONSTEXPR_CXX26 bool test() {
68 test<std::forward_list<int>>();
69 test<std::forward_list<int, min_allocator<int>>>();
70 test<std::forward_list<int, test_allocator<int>>>();
71 test<std::forward_list<long>>();
72 test<std::forward_list<double>>();
73
74 return true;
75}
76
77int main(int, char**) {
78 assert(test());
79#if TEST_STD_VER >= 26
80 static_assert(test());
81#endif
82
83 return 0;
84}
85

source code of libcxx/test/std/containers/sequences/forwardlist/forwardlist.erasure/erase_if.pass.cpp