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song/TagSongFilter: add code comments

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This commit is contained in:
Max Kellermann 2019-03-15 19:52:54 +01:00
parent 67d73a2aee
commit b850eb74b7
1 changed files with 6 additions and 0 deletions
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6
src/song/TagSongFilter.cxx
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@ -54,9 +54,15 @@ TagSongFilter::Match(const Tag &tag) const noexcept
} }
if (type < TAG_NUM_OF_ITEM_TYPES && !visited_types[type]) { if (type < TAG_NUM_OF_ITEM_TYPES && !visited_types[type]) {
/* if the specified tag is not present, try the
fallback tags */
bool result = false; bool result = false;
if (ApplyTagFallback(type, [&](TagType tag2) { if (ApplyTagFallback(type, [&](TagType tag2) {
if (!visited_types[tag2]) if (!visited_types[tag2])
/* we already know that this tag type
isn't present, so let's bail out
without checking again */
return false; return false;
for (const auto &item : tag) { for (const auto &item : tag) {