From 8b786b43446d3e50d3e0d906bc70ba65b70742bf Mon Sep 17 00:00:00 2001
From: lethosor <lethosor@gmail.com>
Date: Mon, 29 May 2023 01:12:35 -0400
Subject: [PATCH] Forward-declare types only used in DataIdentity.cpp

---
 library/DataIdentity.cpp       | 2 ++
 library/include/DataIdentity.h | 7 +++++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/library/DataIdentity.cpp b/library/DataIdentity.cpp
index 0f85e5d95..03851520c 100644
--- a/library/DataIdentity.cpp
+++ b/library/DataIdentity.cpp
@@ -1,11 +1,13 @@
 #include <stddef.h>
 
+#include <condition_variable>
 #include <fstream>
 #include <mutex>
 #include <string>
 #include <vector>
 
 #include "DataFuncs.h"
+#include "DataIdentity.h"
 
 namespace df {
 #define NUMBER_IDENTITY_TRAITS(category, type, name) \
diff --git a/library/include/DataIdentity.h b/library/include/DataIdentity.h
index 232b32108..be5466444 100644
--- a/library/include/DataIdentity.h
+++ b/library/include/DataIdentity.h
@@ -24,16 +24,19 @@ distribution.
 
 #pragma once
 
-#include <condition_variable>
 #include <deque>
 #include <map>
-#include <mutex>
 #include <sstream>
 #include <string>
 #include <vector>
 
 #include "DataDefs.h"
 
+namespace std {
+    class condition_variable;
+    class mutex;
+};
+
 /*
  * Definitions of DFHack namespace structs used by generated headers.
  */