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
9// <list>
10
11// template <class Pred> void remove_if(Pred pred); // before C++20
12// template <class Pred> size_type remove_if(Pred pred); // c++20 and later
13
14#include <list>
15#include <cassert>
16#include <functional>
17
18#include "test_macros.h"
19#include "min_allocator.h"
20#include "counting_predicates.h"
21
22bool even(int i)
23{
24 return i % 2 == 0;
25}
26
27bool g(int i)
28{
29 return i < 3;
30}
31
32struct PredLWG526 {
33 PredLWG526(int i) : i_(i) {}
34 ~PredLWG526() { i_ = -32767; }
35 bool operator()(const PredLWG526& p) const { return p.i_ == i_; }
36
37 bool operator==(int i) const { return i == i_; }
38 int i_;
39};
40
41typedef unary_counting_predicate<bool(*)(int), int> Predicate;
42
43int main(int, char**)
44{
45 {
46 int a1[] = {1, 2, 3, 4};
47 int a2[] = {3, 4};
48 typedef std::list<int> L;
49 L c(a1, a1+4);
50 Predicate cp(g);
51#if TEST_STD_VER > 17
52 ASSERT_SAME_TYPE(L::size_type, decltype(c.remove_if(std::ref(cp))));
53 assert(c.remove_if(std::ref(cp)) == 2);
54#else
55 ASSERT_SAME_TYPE(void, decltype(c.remove_if(std::ref(cp))));
56 c.remove_if(pred: std::ref(t&: cp));
57#endif
58 assert(c == std::list<int>(a2, a2+2));
59 assert(cp.count() == 4);
60 }
61 {
62 int a1[] = {1, 2, 3, 4};
63 int a2[] = {1, 3};
64 std::list<int> c(a1, a1+4);
65 Predicate cp(even);
66#if TEST_STD_VER > 17
67 assert(c.remove_if(std::ref(cp)) == 2);
68#else
69 c.remove_if(pred: std::ref(t&: cp));
70#endif
71 assert(c == std::list<int>(a2, a2+2));
72 assert(cp.count() == 4);
73 }
74 { // LWG issue #526
75 int a1[] = {1, 2, 1, 3, 5, 8, 11};
76 int a2[] = {2, 3, 5, 8, 11};
77 std::list<PredLWG526> c(a1, a1 + 7);
78 c.remove_if(pred: std::ref(t&: c.front()));
79 assert(c.size() == 5);
80 for (std::size_t i = 0; i < c.size(); ++i)
81 {
82 assert(c.front() == a2[i]);
83 c.pop_front();
84 }
85 }
86
87#if TEST_STD_VER >= 11
88 {
89 int a1[] = {1, 2, 3, 4};
90 int a2[] = {3, 4};
91 std::list<int, min_allocator<int>> c(a1, a1+4);
92 Predicate cp(g);
93#if TEST_STD_VER > 17
94 assert(c.remove_if(std::ref(cp)) == 2);
95#else
96 c.remove_if(std::ref(cp));
97#endif
98 assert((c == std::list<int, min_allocator<int>>(a2, a2+2)));
99 assert(cp.count() == 4);
100 }
101#endif
102
103 return 0;
104}
105

source code of libcxx/test/std/containers/sequences/list/list.ops/remove_if.pass.cpp