find_entry_for() const -> find_entry_for()

- current function returns a mismatch of iterators (const vs non-const)

No viable conversion from returned value of type....
'std::__list_const_iterator<std::pair<int, int>, void *>'
...to function return type...
'ts::map<int, int>::bucket_type::bucket_iterator'
...(aka '__list_iterator<std::pair<int, int>, void *>')

- a better solution would be to preserve const-ness, but this will do for now

Author: ITHelpDec

listings/listing_6.11.cpp

@@ -20,7 +20,7 @@ class threadsafe_lookup_table
         bucket_data data;
         mutable std::shared_mutex mutex;
 
-        bucket_iterator find_entry_for(Key const& key) const
+        bucket_iterator find_entry_for(Key const& key)
         {
             return std::find_if(data.begin(),data.end(),
                 [&](bucket_value const& item)