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db/Interface: document CollectUniqueTags()

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Max Kellermann 2018-11-19 12:48:25 +01:00
parent 12f4a8255a
commit 841694ccf2
1 changed files with 5 additions and 0 deletions
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5
src/db/Interface.hxx
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@ -105,6 +105,11 @@ public:
return Visit(selection, VisitDirectory(), visit_song); return Visit(selection, VisitDirectory(), visit_song);
} }
/**
* Collect unique values of the given tag type.
*
* Throws on error.
*/
virtual std::map<std::string, std::set<std::string>> CollectUniqueTags(const DatabaseSelection &selection, virtual std::map<std::string, std::set<std::string>> CollectUniqueTags(const DatabaseSelection &selection,
TagType tag_type, TagType tag_type,
TagType group=TAG_NUM_OF_ITEM_TYPES) const = 0; TagType group=TAG_NUM_OF_ITEM_TYPES) const = 0;