61 lines
1.5 KiB
C++
61 lines
1.5 KiB
C++
/*
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* Copyright 2003-2018 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MPD_TAG_VISIT_FALLBACK_HXX
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#define MPD_TAG_VISIT_FALLBACK_HXX
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#include "Fallback.hxx"
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#include "Tag.hxx"
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template<typename F>
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bool
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VisitTagType(const Tag &tag, TagType type, F &&f) noexcept
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{
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bool found = false;
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for (const auto &item : tag) {
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if (item.type == type) {
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found = true;
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f(item.value);
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}
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}
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return found;
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}
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template<typename F>
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bool
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VisitTagWithFallback(const Tag &tag, TagType type, F &&f) noexcept
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{
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return ApplyTagWithFallback(type,
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[&](TagType type2) {
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return VisitTagType(tag, type2, f);
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});
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}
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template<typename F>
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void
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VisitTagWithFallbackOrEmpty(const Tag &tag, TagType type, F &&f) noexcept
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{
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if (!VisitTagWithFallback(tag, type, f))
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f("");
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}
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#endif
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