tag/Mask: wrap in class

src/command/DatabaseCommands.cxx

@@ -29,6 +29,7 @@
 #include "client/Client.hxx"
 #include "client/Response.hxx"
 #include "tag/ParseName.hxx"
+#include "tag/Mask.hxx"
 #include "util/ConstBuffer.hxx"
 #include "util/StringAPI.hxx"
 #include "SongFilter.hxx"
@@ -191,7 +192,7 @@ handle_list(Client &client, Request args, Response &r)
 	}
 
 	std::unique_ptr<SongFilter> filter;
-	tag_mask_t group_mask = 0;
+	TagMask group_mask = TagMask::None();
 
 	if (args.size == 1) {
 		/* for compatibility with < 0.12.0 */
@@ -216,7 +217,7 @@ handle_list(Client &client, Request args, Response &r)
 			return CommandResult::ERROR;
 		}
 
-		group_mask |= tag_mask_t(1) << unsigned(gt);
+		group_mask |= gt;
 
 		args.pop_back();
 		args.pop_back();
@@ -231,7 +232,7 @@ handle_list(Client &client, Request args, Response &r)
 	}
 
 	if (tagType < TAG_NUM_OF_ITEM_TYPES &&
-	    group_mask & (tag_mask_t(1) << tagType)) {
+	    group_mask.Test(TagType(tagType))) {
 		r.Error(ACK_ERROR_ARG, "Conflicting group");
 		return CommandResult::ERROR;
 	}

src/db/DatabasePrint.cxx

@@ -27,6 +27,7 @@
 #include "client/Response.hxx"
 #include "Partition.hxx"
 #include "tag/Tag.hxx"
+#include "tag/Mask.hxx"
 #include "LightSong.hxx"
 #include "LightDirectory.hxx"
 #include "PlaylistInfo.hxx"
@@ -202,7 +203,7 @@ PrintUniqueTag(Response &r, TagType tag_type,
 
 void
 PrintUniqueTags(Response &r, Partition &partition,
-		unsigned type, tag_mask_t group_mask,
+		unsigned type, TagMask group_mask,
 		const SongFilter *filter)
 {
 	const Database &db = partition.GetDatabaseOrThrow();

src/db/DatabasePrint.hxx

@@ -20,8 +20,7 @@
 #ifndef MPD_DB_PRINT_H
 #define MPD_DB_PRINT_H
 
-#include "tag/Mask.hxx"
-
+class TagMask;
 class SongFilter;
 struct DatabaseSelection;
 struct Partition;
@@ -44,7 +43,7 @@ db_selection_print(Response &r, Partition &partition,
 
 void
 PrintUniqueTags(Response &r, Partition &partition,
-		unsigned type, tag_mask_t group_mask,
+		unsigned type, TagMask group_mask,
 		const SongFilter *filter);
 
 #endif

src/db/Interface.hxx

@@ -22,7 +22,6 @@
 
 #include "Visitor.hxx"
 #include "tag/Type.h"
-#include "tag/Mask.hxx"
 #include "Compiler.h"
 
 #include <time.h>
@@ -31,6 +30,7 @@ struct DatabasePlugin;
 struct DatabaseStats;
 struct DatabaseSelection;
 struct LightSong;
+class TagMask;
 
 class Database {
 	const DatabasePlugin &plugin;
@@ -103,7 +103,7 @@ public:
 	 * Visit all unique tag values.
 	 */
 	virtual void VisitUniqueTags(const DatabaseSelection &selection,
-				     TagType tag_type, tag_mask_t group_mask,
+				     TagType tag_type, TagMask group_mask,
 				     VisitTag visit_tag) const = 0;
 
 	gcc_pure

src/db/UniqueTags.cxx

@@ -21,13 +21,14 @@
 #include "Interface.hxx"
 #include "LightSong.hxx"
 #include "tag/Set.hxx"
+#include "tag/Mask.hxx"
 
 #include <functional>
 
 #include <assert.h>
 
 static void
-CollectTags(TagSet &set, TagType tag_type, tag_mask_t group_mask,
+CollectTags(TagSet &set, TagType tag_type, TagMask group_mask,
 	    const LightSong &song)
 {
 	assert(song.tag != nullptr);
@@ -38,7 +39,7 @@ CollectTags(TagSet &set, TagType tag_type, tag_mask_t group_mask,
 
 void
 VisitUniqueTags(const Database &db, const DatabaseSelection &selection,
-		TagType tag_type, tag_mask_t group_mask,
+		TagType tag_type, TagMask group_mask,
 		VisitTag visit_tag)
 {
 	TagSet set;

src/db/UniqueTags.hxx

@@ -22,14 +22,14 @@
 
 #include "Visitor.hxx"
 #include "tag/Type.h"
-#include "tag/Mask.hxx"
 
+class TagMask;
 class Database;
 struct DatabaseSelection;
 
 void
 VisitUniqueTags(const Database &db, const DatabaseSelection &selection,
-		TagType tag_type, tag_mask_t group_mask,
+		TagType tag_type, TagMask group_mask,
 		VisitTag visit_tag);
 
 #endif

src/db/plugins/ProxyDatabasePlugin.cxx

@@ -33,6 +33,7 @@
 #include "config/Block.hxx"
 #include "tag/Builder.hxx"
 #include "tag/Tag.hxx"
+#include "tag/Mask.hxx"
 #include "util/ScopeExit.hxx"
 #include "util/RuntimeError.hxx"
 #include "protocol/Ack.hxx"
@@ -120,7 +121,7 @@ public:
 		   VisitPlaylist visit_playlist) const override;
 
 	void VisitUniqueTags(const DatabaseSelection &selection,
-			     TagType tag_type, tag_mask_t group_mask,
+			     TagType tag_type, TagMask group_mask,
 			     VisitTag visit_tag) const override;
 
 	DatabaseStats GetStats(const DatabaseSelection &selection) const override;
@@ -756,7 +757,7 @@ ProxyDatabase::Visit(const DatabaseSelection &selection,
 void
 ProxyDatabase::VisitUniqueTags(const DatabaseSelection &selection,
 			       TagType tag_type,
-			       gcc_unused tag_mask_t group_mask,
+			       gcc_unused TagMask group_mask,
 			       VisitTag visit_tag) const
 {
 	// TODO: eliminate the const_cast

src/db/plugins/simple/SimpleDatabasePlugin.cxx

@@ -31,6 +31,7 @@
 #include "DatabaseSave.hxx"
 #include "db/DatabaseLock.hxx"
 #include "db/DatabaseError.hxx"
+#include "tag/Mask.hxx"
 #include "fs/io/TextFile.hxx"
 #include "fs/io/BufferedOutputStream.hxx"
 #include "fs/io/FileOutputStream.hxx"
@@ -301,7 +302,7 @@ SimpleDatabase::Visit(const DatabaseSelection &selection,
 
 void
 SimpleDatabase::VisitUniqueTags(const DatabaseSelection &selection,
-				TagType tag_type, tag_mask_t group_mask,
+				TagType tag_type, TagMask group_mask,
 				VisitTag visit_tag) const
 {
 	::VisitUniqueTags(*this, selection, tag_type, group_mask, visit_tag);

src/db/plugins/simple/SimpleDatabasePlugin.hxx

@@ -120,7 +120,7 @@ public:
 		   VisitPlaylist visit_playlist) const override;
 
 	void VisitUniqueTags(const DatabaseSelection &selection,
-			     TagType tag_type, tag_mask_t group_mask,
+			     TagType tag_type, TagMask group_mask,
 			     VisitTag visit_tag) const override;
 
 	DatabaseStats GetStats(const DatabaseSelection &selection) const override;

src/db/plugins/upnp/UpnpDatabasePlugin.cxx

@@ -35,6 +35,7 @@
 #include "config/Block.hxx"
 #include "tag/Builder.hxx"
 #include "tag/Table.hxx"
+#include "tag/Mask.hxx"
 #include "fs/Traits.hxx"
 #include "Log.hxx"
 #include "SongFilter.hxx"
@@ -88,7 +89,7 @@ public:
 		   VisitPlaylist visit_playlist) const override;
 
 	void VisitUniqueTags(const DatabaseSelection &selection,
-			     TagType tag_type, tag_mask_t group_mask,
+			     TagType tag_type, TagMask group_mask,
 			     VisitTag visit_tag) const override;
 
 	DatabaseStats GetStats(const DatabaseSelection &selection) const override;
@@ -605,7 +606,7 @@ UpnpDatabase::Visit(const DatabaseSelection &selection,
 
 void
 UpnpDatabase::VisitUniqueTags(const DatabaseSelection &selection,
-			      TagType tag, gcc_unused tag_mask_t group_mask,
+			      TagType tag, gcc_unused TagMask group_mask,
 			      VisitTag visit_tag) const
 {
 	// TODO: use group_mask

src/tag/Config.cxx

@@ -37,7 +37,7 @@ TagLoadConfig()
 	if (value == nullptr)
 		return;
 
-	global_tag_mask = 0;
+	global_tag_mask = TagMask::None();
 
 	if (StringEqualsCaseASCII(value, "none"))
 		return;
@@ -60,7 +60,7 @@ TagLoadConfig()
 				FormatFatalError("error parsing metadata item \"%s\"",
 						 c);
 
-			global_tag_mask |= tag_mask_t(1) << unsigned(type);
+			global_tag_mask |= type;
 
 			s++;
 			c = s;

src/tag/Mask.hxx

@@ -20,8 +20,73 @@
 #ifndef MPD_TAG_MASK_HXX
 #define MPD_TAG_MASK_HXX
 
+#include "Type.h"
+
 #include <stdint.h>
 
-typedef uint_least32_t tag_mask_t;
+class TagMask {
+	typedef uint_least32_t mask_t;
+	mask_t value;
+
+	explicit constexpr TagMask(uint_least32_t _value)
+		:value(_value) {}
+
+public:
+	TagMask() = default;
+
+	constexpr TagMask(TagType tag)
+		:value(mask_t(1) << mask_t(tag)) {}
+
+	static constexpr TagMask None() {
+		return TagMask(mask_t(0));
+	}
+
+	static constexpr TagMask All() {
+		return ~None();
+	}
+
+	constexpr TagMask operator~() const {
+		return TagMask(~value);
+	}
+
+	constexpr TagMask operator&(TagMask other) const {
+		return TagMask(value & other.value);
+	}
+
+	constexpr TagMask operator|(TagMask other) const {
+		return TagMask(value | other.value);
+	}
+
+	constexpr TagMask operator^(TagMask other) const {
+		return TagMask(value ^ other.value);
+	}
+
+	TagMask &operator&=(TagMask other) {
+		value |= other.value;
+		return *this;
+	}
+
+	TagMask &operator|=(TagMask other) {
+		value |= other.value;
+		return *this;
+	}
+
+	TagMask &operator^=(TagMask other) {
+		value |= other.value;
+		return *this;
+	}
+
+	constexpr bool TestAny() const {
+		return value != 0;
+	}
+
+	constexpr bool Test(TagType tag) const {
+		return (*this & tag).TestAny();
+	}
+
+	void Set(TagType tag) {
+		*this |= tag;
+	}
+};
 
 #endif

src/tag/Set.cxx

@@ -19,6 +19,7 @@
 
 #include "Set.hxx"
 #include "Builder.hxx"
+#include "Mask.hxx"
 #include "Settings.hxx"
 
 #include <assert.h>
@@ -58,16 +59,16 @@ CopyTagItem(TagBuilder &dest, const Tag &src, TagType type)
  * Copy all tag items of the types in the mask.
  */
 static void
-CopyTagMask(TagBuilder &dest, const Tag &src, tag_mask_t mask)
+CopyTagMask(TagBuilder &dest, const Tag &src, TagMask mask)
 {
 	for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i)
-		if ((mask & (tag_mask_t(1) << i)) != 0)
+		if (mask.Test(TagType(i)))
 			CopyTagItem(dest, src, TagType(i));
 }
 
 void
 TagSet::InsertUnique(const Tag &src, TagType type, const char *value,
-		     tag_mask_t group_mask)
+		     TagMask group_mask)
 {
 	TagBuilder builder;
 	if (value == nullptr)
@@ -85,7 +86,7 @@ TagSet::InsertUnique(const Tag &src, TagType type, const char *value,
 bool
 TagSet::CheckUnique(TagType dest_type,
 		    const Tag &tag, TagType src_type,
-		    tag_mask_t group_mask)
+		    TagMask group_mask)
 {
 	bool found = false;
 
@@ -101,12 +102,12 @@ TagSet::CheckUnique(TagType dest_type,
 
 void
 TagSet::InsertUnique(const Tag &tag,
-		     TagType type, tag_mask_t group_mask)
+		     TagType type, TagMask group_mask)
 {
 	static_assert(sizeof(group_mask) * 8 >= TAG_NUM_OF_ITEM_TYPES,
 		      "Mask is too small");
 
-	assert((group_mask & (tag_mask_t(1) << unsigned(type))) == 0);
+	assert(!group_mask.Test(type));
 
 	if (!CheckUnique(type, tag, type, group_mask) &&
 	    (type != TAG_ALBUM_ARTIST ||

src/tag/Set.hxx

@@ -22,12 +22,13 @@
 
 #include "Compiler.h"
 #include "Tag.hxx"
-#include "Mask.hxx"
 
 #include <set>
 
 #include <string.h>
 
+class TagMask;
+
 /**
  * Helper class for #TagSet which compares two #Tag objects.
  */
@@ -59,15 +60,15 @@ struct TagLess {
 class TagSet : public std::set<Tag, TagLess> {
 public:
 	void InsertUnique(const Tag &tag,
-			  TagType type, tag_mask_t group_mask);
+			  TagType type, TagMask group_mask);
 
 private:
 	void InsertUnique(const Tag &src, TagType type, const char *value,
-			  tag_mask_t group_mask);
+			  TagMask group_mask);
 
 	bool CheckUnique(TagType dest_type,
 			 const Tag &tag, TagType src_type,
-			 tag_mask_t group_mask);
+			 TagMask group_mask);
 };
 
 #endif

src/tag/Settings.cxx

@@ -19,4 +19,4 @@
 
 #include "Settings.hxx"
 
-tag_mask_t global_tag_mask = (tag_mask_t)-1 & ~(1 << TAG_COMMENT);
+TagMask global_tag_mask = TagMask::All() & ~TagMask(TAG_COMMENT);

src/tag/Settings.hxx

@@ -24,20 +24,20 @@
 #include "Type.h"
 #include "Compiler.h"
 
-extern tag_mask_t global_tag_mask;
+extern TagMask global_tag_mask;
 
 gcc_const
 static inline bool
-IsTagEnabled(unsigned tag)
+IsTagEnabled(TagType tag)
 {
-	return global_tag_mask & (1u << tag);
+	return global_tag_mask.Test(tag);
 }
 
 gcc_const
 static inline bool
-IsTagEnabled(TagType tag)
+IsTagEnabled(unsigned tag)
 {
-	return IsTagEnabled(unsigned(tag));
+	return IsTagEnabled(TagType(tag));
 }
 
 #endif