allow altering the max size of o3tl::lru_cache

Change-Id: Id119b70275e1c88a8c57f89d915241427be9dbf5
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/116927
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/include/o3tl/lru_map.hxx b/include/o3tl/lru_map.hxx
index dc8a102977dd..41c215255c7a 100644
--- a/include/o3tl/lru_map.hxx
+++ b/include/o3tl/lru_map.hxx
@@ -50,7 +50,7 @@ private:
 
     list_t mLruList;
     map_t mLruMap;
-    const size_t mMaxSize;
+    size_t mMaxSize;
 
     void checkLRU()
     {
@@ -80,6 +80,13 @@ public:
         list_t().swap(mLruList);
     }
 
+    void setMaxSize(size_t nMaxSize)
+    {
+        mMaxSize = nMaxSize ? nMaxSize : std::min(mLruMap.max_size(), mLruList.max_size());
+        while (mLruMap.size() > mMaxSize)
+            checkLRU();
+    }
+
     void insert(key_value_pair_t& rPair)
     {
         map_iterator_t i = mLruMap.find(rPair.first);