blob: 26f8f57839ac999764164b9e3191835f6e58b1c4 (
plain) (
blame)
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
|
// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/util/noncopyable.hpp>
#include <vespa/vespalib/util/sync.h>
namespace vespalib
{
template <typename T>
class VarHolder : public noncopyable
{
T _v;
vespalib::Lock _lock;
public:
VarHolder(void)
: _v(),
_lock()
{
}
explicit
VarHolder(const T &v)
: _v(v),
_lock()
{
}
~VarHolder(void)
{
}
void
set(const T &v)
{
T old;
{
vespalib::LockGuard guard(_lock);
old = _v;
_v = v;
}
}
void
clear(void)
{
set(T());
}
T
get(void) const
{
vespalib::LockGuard guard(_lock);
return _v;
}
};
} // namespace vespalib
|
