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TagBuilder: skip unnecessary preperation if there are no items to add

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This commit is contained in:
gd 2022-11-01 17:53:22 +02:00
parent ab687481cc
commit a1359f2388
1 changed files with 10 additions and 11 deletions
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21
src/tag/Builder.cxx
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@ -33,10 +33,9 @@
TagBuilder::TagBuilder(const Tag &other) noexcept
:duration(other.duration), has_playlist(other.has_playlist)
{
items.reserve(other.num_items);
const std::size_t n = other.num_items;
if (n > 0) {
items.reserve(other.num_items);
const std::scoped_lock<Mutex> protect(tag_pool_lock);
for (std::size_t i = 0; i != n; ++i)
items.push_back(tag_pool_dup_item(other.items[i]));
@ -176,17 +175,17 @@ TagBuilder::Complement(const Tag &other) noexcept
has_playlist |= other.has_playlist;
/* build a table of tag types that were already present in
this object, which will not be copied from #other */
std::array<bool, TAG_NUM_OF_ITEM_TYPES> present;
present.fill(false);
for (const TagItem *i : items)
present[i->type] = true;
items.reserve(items.size() + other.num_items);
const std::size_t n = other.num_items;
if (n > 0) {
/* build a table of tag types that were already present in
this object, which will not be copied from #other */
std::array<bool, TAG_NUM_OF_ITEM_TYPES> present;
present.fill(false);
for (const TagItem *i : items)
present[i->type] = true;
items.reserve(items.size() + n);
const std::scoped_lock<Mutex> protect(tag_pool_lock);
for (std::size_t i = 0; i != n; ++i) {
TagItem *item = other.items[i];