tag/Settings: add function IsTagEnabled() wrapping access to ignore_tag_items[]

src/TagPrint.cxx

@@ -27,7 +27,7 @@ void
 tag_print_types(Response &r)
 {
 	for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; i++)
-		if (!ignore_tag_items[i])
+		if (IsTagEnabled(i))
 			r.Format("tagtype: %s\n", tag_item_names[i]);
 }
 

src/db/plugins/simple/DatabaseSave.cxx

@@ -58,7 +58,7 @@ db_save_internal(BufferedOutputStream &os, const Directory &music_root)
 	os.Format("%s%s\n", DIRECTORY_FS_CHARSET, GetFSCharset());
 
 	for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i)
-		if (!ignore_tag_items[i])
+		if (IsTagEnabled(i))
 			os.Format(DB_TAG_PREFIX "%s\n", tag_item_names[i]);
 
 	os.Format("%s\n", DIRECTORY_INFO_END);
@@ -142,7 +142,7 @@ db_load_internal(TextFile &file, Directory &music_root, Error &error)
 	}
 
 	for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i) {
-		if (!ignore_tag_items[i] && !tags[i]) {
+		if (IsTagEnabled(i) && !tags[i]) {
 			error.Set(db_domain,
 				  "Tag list mismatch, "
 				  "discarding database file");

src/tag/Set.cxx

@@ -110,7 +110,7 @@ TagSet::InsertUnique(const Tag &tag,
 
 	if (!CheckUnique(type, tag, type, group_mask) &&
 	    (type != TAG_ALBUM_ARTIST ||
-	     ignore_tag_items[TAG_ALBUM_ARTIST] ||
+	     !IsTagEnabled(TAG_ALBUM_ARTIST) ||
 	     /* fall back to "Artist" if no "AlbumArtist" was found */
 	     !CheckUnique(type, tag, TAG_ARTIST, group_mask)))
 		InsertUnique(tag, type, nullptr, group_mask);

src/tag/TagBuilder.cxx

@@ -220,7 +220,7 @@ TagBuilder::AddItem(TagType type, const char *value, size_t length)
 	assert(value != nullptr);
 #endif
 
-	if (length == 0 || ignore_tag_items[type])
+	if (length == 0 || !IsTagEnabled(type))
 		return;
 
 	AddItemInternal(type, value, length);

src/tag/TagSettings.h

@@ -21,9 +21,28 @@
 #define MPD_TAG_SETTINGS_H
 
 #include "TagType.h"
+#include "Compiler.h"
 
 #include <stdbool.h>
 
 extern bool ignore_tag_items[TAG_NUM_OF_ITEM_TYPES];
 
+#ifdef __cplusplus
+
+gcc_const
+static inline bool
+IsTagEnabled(unsigned tag)
+{
+	return !ignore_tag_items[tag];
+}
+
+gcc_const
+static inline bool
+IsTagEnabled(TagType tag)
+{
+	return IsTagEnabled(unsigned(tag));
+}
+
+#endif
+
 #endif