From 65f1cafa432acd26b5ca4b94c73cde9b7ca2ac1c Mon Sep 17 00:00:00 2001
From: Max Kellermann <mk@cm4all.com>
Date: Wed, 30 Nov 2022 20:35:28 +0100
Subject: [PATCH] util/IntrusiveHashSet: add method find_if()
---
src/util/IntrusiveHashSet.hxx | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/src/util/IntrusiveHashSet.hxx b/src/util/IntrusiveHashSet.hxx
index fe512272e..06ec5d6d8 100644
--- a/src/util/IntrusiveHashSet.hxx
+++ b/src/util/IntrusiveHashSet.hxx
@@ -259,6 +259,23 @@ public:
return end();
}
+ /**
+ * Like find(), but returns an item that matches the given
+ * predicate. This is useful if the container can contain
+ * multiple items that compare equal (according to #Equal, but
+ * not according to #pred).
+ */
+ [[nodiscard]] [[gnu::pure]]
+ constexpr bucket_iterator find_if(const auto &key,
+ auto &&pred) noexcept {
+ auto &bucket = GetBucket(key);
+ for (auto &i : bucket)
+ if (equal(key, i) && pred(i))
+ return bucket.iterator_to(i);
+
+ return end();
+ }
+
constexpr bucket_iterator end() noexcept {
return table.front().end();
}