blob: 14d96b88368e640534088bd55eaf5224cc915cd6 (
plain)
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
|
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef SUPPORT_TRACKED_VALUE_H
#define SUPPORT_TRACKED_VALUE_H
#include <cassert>
struct TrackedValue {
enum State { CONSTRUCTED, MOVED_FROM, DESTROYED };
State state;
TrackedValue() : state(State::CONSTRUCTED) {}
TrackedValue(TrackedValue const& t) : state(State::CONSTRUCTED) {
assert(t.state != State::MOVED_FROM && "copying a moved-from object");
assert(t.state != State::DESTROYED && "copying a destroyed object");
}
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
TrackedValue(TrackedValue&& t) : state(State::CONSTRUCTED) {
assert(t.state != State::MOVED_FROM && "double moving from an object");
assert(t.state != State::DESTROYED && "moving from a destroyed object");
t.state = State::MOVED_FROM;
}
#endif
TrackedValue& operator=(TrackedValue const& t) {
assert(state != State::DESTROYED && "copy assigning into destroyed object");
assert(t.state != State::MOVED_FROM && "copying a moved-from object");
assert(t.state != State::DESTROYED && "copying a destroyed object");
state = t.state;
return *this;
}
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
TrackedValue& operator=(TrackedValue&& t) {
assert(state != State::DESTROYED && "move assigning into destroyed object");
assert(t.state != State::MOVED_FROM && "double moving from an object");
assert(t.state != State::DESTROYED && "moving from a destroyed object");
state = t.state;
t.state = State::MOVED_FROM;
return *this;
}
#endif
~TrackedValue() {
assert(state != State::DESTROYED && "double-destroying an object");
state = State::DESTROYED;
}
};
#endif // SUPPORT_TRACKED_VALUE_H
|
