tag/Tag: Merge() returns Tag, MergePtr() returns std::unique_ptr<Tag>

src/decoder/Bridge.cxx

@@ -474,8 +474,8 @@ DecoderBridge::SubmitData(InputStream *is,
 	if (UpdateStreamTag(is)) {
 		if (decoder_tag != nullptr)
 			/* merge with tag from decoder plugin */
-			cmd = DoSendTag(*Tag::Merge(*decoder_tag,
-						    *stream_tag));
+			cmd = DoSendTag(Tag::Merge(*decoder_tag,
+						   *stream_tag));
 		else
 			/* send only the stream tag */
 			cmd = DoSendTag(*stream_tag);
@@ -598,7 +598,7 @@ DecoderBridge::SubmitTag(InputStream *is, Tag &&tag) noexcept
 
 	if (stream_tag != nullptr)
 		/* merge with tag from input stream */
-		cmd = DoSendTag(*Tag::Merge(*stream_tag, *decoder_tag));
+		cmd = DoSendTag(Tag::Merge(*stream_tag, *decoder_tag));
 	else
 		/* send only the decoder tag */
 		cmd = DoSendTag(*decoder_tag);

src/input/IcyInputStream.cxx

@@ -92,7 +92,7 @@ IcyInputStream::ReadTag() noexcept
 	if (icy_tag == nullptr)
 		return std::make_unique<Tag>(*input_tag);
 
-	return Tag::Merge(*input_tag, *icy_tag);
+	return Tag::MergePtr(*input_tag, *icy_tag);
 }
 
 size_t

src/tag/Tag.cxx

@@ -53,11 +53,19 @@ Tag::Tag(const Tag &other) noexcept
 	}
 }
 
-std::unique_ptr<Tag>
+Tag
 Tag::Merge(const Tag &base, const Tag &add) noexcept
 {
 	TagBuilder builder(add);
 	builder.Complement(base);
+	return builder.Commit();
+}
+
+std::unique_ptr<Tag>
+Tag::MergePtr(const Tag &base, const Tag &add) noexcept
+{
+	TagBuilder builder(add);
+	builder.Complement(base);
 	return builder.CommitNew();
 }
 
@@ -70,7 +78,7 @@ Tag::Merge(std::unique_ptr<Tag> base, std::unique_ptr<Tag> add) noexcept
 	if (base == nullptr)
 		return add;
 
-	return Merge(*base, *add);
+	return MergePtr(*base, *add);
 }
 
 const char *

src/tag/Tag.hxx

@@ -117,8 +117,11 @@ struct Tag {
 	 *
 	 * @return a newly allocated tag
 	 */
-	static std::unique_ptr<Tag> Merge(const Tag &base,
-					  const Tag &add) noexcept;
+	static Tag Merge(const Tag &base,
+			 const Tag &add) noexcept;
+
+	static std::unique_ptr<Tag> MergePtr(const Tag &base,
+					     const Tag &add) noexcept;
 
 	/**
 	 * Merges the data from two tags.  Any of the two may be nullptr.  Both