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
/*
* Copyright 2003-2021 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_TAG_VISIT_FALLBACK_HXX
#define MPD_TAG_VISIT_FALLBACK_HXX
#include "Fallback.hxx"
#include "Tag.hxx"
template<typename F>
bool
VisitTagType(const Tag &tag, TagType type, F &&f) noexcept
{
bool found = false;
for (const auto &item : tag) {
if (item.type == type) {
found = true;
f(item.value);
}
}
return found;
}
template<typename F>
bool
VisitTagWithFallback(const Tag &tag, TagType type, F &&f) noexcept
{
return ApplyTagWithFallback(type,
[&](TagType type2) {
return VisitTagType(tag, type2, f);
});
}
template<typename F>
void
VisitTagWithFallbackOrEmpty(const Tag &tag, TagType type, F &&f) noexcept
{
if (!VisitTagWithFallback(tag, type, f))
f("");
}
#endif