2018-08-02 13:54:36 +02:00
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/*
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2021-01-01 19:54:25 +01:00
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* Copyright 2003-2021 The Music Player Daemon Project
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2018-08-02 13:54:36 +02:00
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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_I_SONG_FILTER_HXX
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#define MPD_I_SONG_FILTER_HXX
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2018-08-20 16:19:17 +02:00
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#include "util/Compiler.h"
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2018-08-02 13:54:36 +02:00
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#include <memory>
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#include <string>
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struct LightSong;
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class ISongFilter;
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using ISongFilterPtr = std::unique_ptr<ISongFilter>;
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class ISongFilter {
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public:
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virtual ~ISongFilter() noexcept {}
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virtual ISongFilterPtr Clone() const noexcept = 0;
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/**
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* Convert this object into an "expression". This is
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* only useful for debugging.
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*/
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virtual std::string ToExpression() const noexcept = 0;
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gcc_pure
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virtual bool Match(const LightSong &song) const noexcept = 0;
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};
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#endif
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