Add optional callback to the CTable:resize() method

src/lib/ctable.lua

@@ -132,7 +132,8 @@ local optional_params = {
  hash_seed = false,
  initial_size = 8,
  max_occupancy_rate = 0.9,
- min_occupancy_rate = 0.0
+ min_occupancy_rate = 0.0,
+ resize_callback = false
 }
 
 function new(params)
@@ -153,6 +154,7 @@ function new(params)
  ctab.occupancy = 0
  ctab.max_occupancy_rate = params.max_occupancy_rate
  ctab.min_occupancy_rate = params.min_occupancy_rate
+ ctab.resize_callback = params.resize_callback
  ctab = setmetatable(ctab, { __index = CTable })
  ctab:reseed_hash_function(params.hash_seed)
  ctab:resize(params.initial_size)
@@ -236,6 +238,9 @@ function CTable:resize(size)
  self:add(old_entries[i].key, old_entries[i].value)
  end
  end
+ if self.resize_callback then
+ self.resize_callback(self, old_size)
+ end
 end
 
 function CTable:get_backing_size()