From 4e9d4dd80adc4cbe9e06016c10535f4f0fea2bc6 Mon Sep 17 00:00:00 2001
From: Jonathan G Rennison <j.g.rennison@gmail.com>
Date: Sat, 4 Mar 2017 23:39:27 +0000
Subject: [PATCH] Add a PreCleanPool() static method to pool item types.

(cherry picked from commit 87142ed840bb76361bc7a7219d643e49358487dd)
---
 src/core/pool_func.hpp | 1 +
 src/core/pool_type.hpp | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/src/core/pool_func.hpp b/src/core/pool_func.hpp
index 5569addbd7..a5375e13fc 100644
--- a/src/core/pool_func.hpp
+++ b/src/core/pool_func.hpp
@@ -196,6 +196,7 @@ DEFINE_POOL_METHOD(void)::FreeItem(size_t index)
 DEFINE_POOL_METHOD(void)::CleanPool()
 {
 	this->cleaning = true;
+	Titem::PreCleanPool();
 	for (size_t i = 0; i < this->first_unused; i++) {
 		delete this->Get(i); // 'delete NULL;' is very valid
 	}
diff --git a/src/core/pool_type.hpp b/src/core/pool_type.hpp
index 4d20ed1abb..70f6480103 100644
--- a/src/core/pool_type.hpp
+++ b/src/core/pool_type.hpp
@@ -286,6 +286,13 @@ struct Pool : PoolBase {
 		 * @note it's called only when !CleaningPool()
 		 */
 		static inline void PostDestructor(size_t index) { }
+
+		/**
+		 * Dummy function called before a pool is about to be cleaned.
+		 * If you want to use it, override it in PoolItem's subclass.
+		 * @note it's called only when CleaningPool()
+		 */
+		static inline void PreCleanPool() { }
 	};
 
 private: