From 8a890cf945cfbd72f6e4b64f8c7b52d2c6ca099e Mon Sep 17 00:00:00 2001
From: peterbell10 <peterbell10@live.co.uk>
Date: Mon, 22 May 2017 21:27:55 +0100
Subject: Store cChunk::m_BlockEntities in a map (#3717)

* Store block entities in a map from block index
* Cleanup ForEachBlockEntity
* Cleanup DoWithBlockEntityAt
---
 src/BlockID.h | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

(limited to 'src/BlockID.h')

diff --git a/src/BlockID.h b/src/BlockID.h
index 8ce7a040b..bd24f9312 100644
--- a/src/BlockID.h
+++ b/src/BlockID.h
@@ -1212,3 +1212,31 @@ extern cItem GetIniItemSet(cIniFile & a_IniFile, const char * a_Section, const c
 
 
 
+/** Base case for IsOneOf to handle empty template aguments. */
+template <class = void>
+bool IsOneOf(BLOCKTYPE a_BlockType)
+{
+	return false;
+}
+
+
+/** Returns true if a_BlockType is equal to any of the variadic template arguments.
+Some example usage:
+\code
+	IsOneOf<>(E_BLOCK_AIR)                           == false
+	IsOneOf<E_BLOCK_AIR>(E_BLOCK_DIRT)               == false
+	IsOneOf<E_BLOCK_AIR, E_BLOCK_DIRT>(E_BLOCK_DIRT) == true
+\endcode
+The implementation is ugly but it is equivalent to this C++17 fold expression:
+\code
+	((a_BlockType == Types) || ...)
+\endcode
+Just written to be valid without fold expressions or SFINAE. */
+template <BLOCKTYPE Head, BLOCKTYPE ... Tail>
+bool IsOneOf(BLOCKTYPE a_BlockType)
+{
+	return ((a_BlockType == Head) || (IsOneOf<Tail...>(a_BlockType)));
+}
+
+
+
-- 
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