MPD
0.20.15
util
ScopeExit.hxx
Go to the documentation of this file.
1
/*
2
* Copyright (C) 2015 Max Kellermann <max.kellermann@gmail.com>
3
*
4
* Redistribution and use in source and binary forms, with or without
5
* modification, are permitted provided that the following conditions
6
* are met:
7
*
8
* - Redistributions of source code must retain the above copyright
9
* notice, this list of conditions and the following disclaimer.
10
*
11
* - Redistributions in binary form must reproduce the above copyright
12
* notice, this list of conditions and the following disclaimer in the
13
* documentation and/or other materials provided with the
14
* distribution.
15
*
16
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
19
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
20
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
21
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
25
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
27
* OF THE POSSIBILITY OF SUCH DAMAGE.
28
*/
29
30
#ifndef SCOPE_EXIT_HXX
31
#define SCOPE_EXIT_HXX
32
33
#include "
Compiler.h
"
34
35
#include <utility>
36
40
template
<
typename
F>
41
class
ScopeExitGuard
: F {
42
bool
enabled =
true
;
43
44
public
:
45
explicit
ScopeExitGuard
(F &&f):F(std::forward<F>(f)) {}
46
47
ScopeExitGuard
(
ScopeExitGuard
&&src)
48
:F(std::move(src)), enabled(src.enabled) {
49
src.enabled =
false
;
50
}
51
52
~ScopeExitGuard
() {
53
if
(enabled)
54
F::operator()();
55
}
56
57
ScopeExitGuard
(
const
ScopeExitGuard
&) =
delete
;
58
ScopeExitGuard
&
operator=
(
const
ScopeExitGuard
&) =
delete
;
59
};
60
64
struct
ScopeExitTag
{
65
/* this operator is a trick so we don't need to close
66
parantheses at the end of the expression AtScopeExit()
67
call */
68
template
<
typename
F>
69
ScopeExitGuard<F>
operator+
(F &&f) {
70
return
ScopeExitGuard<F>
(std::forward<F>(f));
71
}
72
};
73
74
#define ScopeExitCat(a, b) a ## b
75
#define ScopeExitName(line) ScopeExitCat(at_scope_exit_, line)
76
87
#define AtScopeExit(...) auto ScopeExitName(__LINE__) = ScopeExitTag() + [__VA_ARGS__]()
88
89
#endif
ScopeExitGuard::operator=
ScopeExitGuard & operator=(const ScopeExitGuard &)=delete
ScopeExitGuard::ScopeExitGuard
ScopeExitGuard(ScopeExitGuard &&src)
Definition:
ScopeExit.hxx:47
ScopeExitTag
Internal class.
Definition:
ScopeExit.hxx:64
Compiler.h
ScopeExitGuard
Internal class.
Definition:
ScopeExit.hxx:41
ScopeExitGuard::ScopeExitGuard
ScopeExitGuard(F &&f)
Definition:
ScopeExit.hxx:45
ScopeExitTag::operator+
ScopeExitGuard< F > operator+(F &&f)
Definition:
ScopeExit.hxx:69
ScopeExitGuard::~ScopeExitGuard
~ScopeExitGuard()
Definition:
ScopeExit.hxx:52
Generated on Thu Jan 11 2018 20:53:19 for MPD by
1.8.14