979f1b6c39
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75 lines
1.9 KiB
C++
75 lines
1.9 KiB
C++
/*
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* Copyright 2003-2017 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_SET_HXX
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#define MPD_TAG_SET_HXX
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#include "Compiler.h"
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#include "Tag.hxx"
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#include <set>
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#include <string.h>
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class TagMask;
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/**
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* Helper class for #TagSet which compares two #Tag objects.
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*/
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struct TagLess {
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gcc_pure
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bool operator()(const Tag &a, const Tag &b) const noexcept {
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if (a.num_items != b.num_items)
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return a.num_items < b.num_items;
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const unsigned n = a.num_items;
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for (unsigned i = 0; i < n; ++i) {
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const TagItem &ai = *a.items[i];
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const TagItem &bi = *b.items[i];
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if (ai.type != bi.type)
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return unsigned(ai.type) < unsigned(bi.type);
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const int cmp = strcmp(ai.value, bi.value);
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if (cmp != 0)
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return cmp < 0;
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}
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return false;
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}
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};
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/**
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* A set of #Tag objects.
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*/
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class TagSet : public std::set<Tag, TagLess> {
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public:
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void InsertUnique(const Tag &tag,
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TagType type, TagMask group_mask) noexcept;
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private:
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void InsertUnique(const Tag &src, TagType type, const char *value,
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TagMask group_mask) noexcept;
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bool CheckUnique(TagType dest_type,
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const Tag &tag, TagType src_type,
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TagMask group_mask) noexcept;
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};
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#endif
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