1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// UNSUPPORTED: no-exceptions
// <flat_map>
// class flat_multimap
// template<class Key, class T, class Compare, class KeyContainer, class MappedContainer, class Predicate>
// typename flat_multimap<Key, T, Compare, KeyContainer, MappedContainer>::size_type
// erase_if(flat_multimap<Key, T, Compare, KeyContainer, MappedContainer>& c, Predicate pred);
// If any member function in [flat.set.defn] exits via an exception, the invariant is restored.
// (This is not a member function, but let's respect the invariant anyway.)
#include <algorithm>
#include <cassert>
#include <deque>
#include <flat_map>
#include <functional>
#include <utility>
#include <vector>
#include "../helpers.h"
#include "test_macros.h"
struct Counter {
int c1, c2, throws;
void tick() {
c1 -= 1;
if (c1 == 0) {
c1 = c2;
throws += 1;
throw 42;
}
}
};
Counter g_counter = {0, 0, 0};
struct ThrowingAssignment {
ThrowingAssignment(int i) : i_(i) {}
ThrowingAssignment(const ThrowingAssignment&) = default;
ThrowingAssignment& operator=(const ThrowingAssignment& rhs) {
g_counter.tick();
i_ = rhs.i_;
g_counter.tick();
return *this;
}
operator int() const { return i_; }
int i_;
};
struct ThrowingComparator {
bool operator()(const ThrowingAssignment& a, const ThrowingAssignment& b) const {
g_counter.tick();
return a.i_ < b.i_;
}
};
struct ErasurePredicate {
bool operator()(const auto& x) const { return (3 <= x.first && x.first <= 5); }
};
int main(int, char**) {
const std::pair<int, int> expected[] = {{1, 1}, {2, 2}, {3, 3}, {3, 3}, {5, 5}, {6, 6}, {7, 7}, {8, 8}};
{
using M = std::flat_multimap<ThrowingAssignment, int, ThrowingComparator>;
for (int first_throw = 1; first_throw < 99; ++first_throw) {
for (int second_throw = 1; second_throw < 99; ++second_throw) {
g_counter = {0, 0, 0};
M m = M({1, 2, 3, 3, 5, 6, 7, 8}, {1, 2, 3, 3, 5, 6, 7, 8});
try {
g_counter = {first_throw, second_throw, 0};
auto n = std::erase_if(m, ErasurePredicate());
assert(n == 3);
// If it didn't throw at all, we're done.
g_counter = {0, 0, 0};
assert((m == M{{1, 1}, {2, 2}, {6, 6}, {7, 7}, {8, 8}}));
first_throw = 99; // "done"
break;
} catch (int ex) {
assert(ex == 42);
check_invariant(m);
LIBCPP_ASSERT(m.empty() || std::equal(m.begin(), m.end(), expected, expected + 8));
if (g_counter.throws == 1) {
// We reached the first throw but not the second throw.
break;
}
}
}
}
}
{
using M = std::flat_multimap<int, ThrowingAssignment, ThrowingComparator>;
for (int first_throw = 1; first_throw < 99; ++first_throw) {
for (int second_throw = 1; second_throw < 99; ++second_throw) {
g_counter = {0, 0, 0};
M m = M({1, 2, 3, 3, 5, 6, 7, 8}, {1, 2, 3, 3, 5, 6, 7, 8});
try {
g_counter = {first_throw, second_throw, 0};
auto n = std::erase_if(m, ErasurePredicate());
assert(n == 3);
// If it didn't throw at all, we're done.
g_counter = {0, 0, 0};
assert((m == M{{1, 1}, {2, 2}, {6, 6}, {7, 7}, {8, 8}}));
first_throw = 99; // "done"
break;
} catch (int ex) {
assert(ex == 42);
check_invariant(m);
LIBCPP_ASSERT(m.empty() || std::equal(m.begin(), m.end(), expected, expected + 8));
if (g_counter.throws == 1) {
// We reached the first throw but not the second throw.
break;
}
}
}
}
}
{
using M = std::
flat_multimap<ThrowingAssignment, int, ThrowingComparator, std::deque<ThrowingAssignment>, std::deque<int>>;
for (int first_throw = 1; first_throw < 99; ++first_throw) {
for (int second_throw = 1; second_throw < 99; ++second_throw) {
g_counter = {0, 0, 0};
std::deque<ThrowingAssignment> container = {5, 6, 7, 8};
container.insert(container.begin(), {1, 2, 3, 3});
M m = M(std::move(container), {1, 2, 3, 3, 5, 6, 7, 8});
try {
g_counter = {first_throw, second_throw, 0};
auto n = std::erase_if(m, ErasurePredicate());
assert(n == 3);
// If it didn't throw at all, we're done.
g_counter = {0, 0, 0};
assert((m == M{{1, 1}, {2, 2}, {6, 6}, {7, 7}, {8, 8}}));
first_throw = 99; // "done"
break;
} catch (int ex) {
assert(ex == 42);
check_invariant(m);
LIBCPP_ASSERT(m.empty() || std::equal(m.begin(), m.end(), expected, expected + 8));
if (g_counter.throws == 1) {
// We reached the first throw but not the second throw.
break;
}
}
}
}
}
return 0;
}
|
