DataIdentity support for `std::future<void>`

library/DataIdentity.cpp

@@ -9,6 +9,9 @@
 #include "DataFuncs.h"
 #include "DataIdentity.h"
 
+// the space after the uses of "type" in OPAQUE_IDENTITY_TRAITS_NAME is _required_
+// without it the macro generates a syntax error when type is a template specification
+
 namespace df {
 #define NUMBER_IDENTITY_TRAITS(category, type, name) \
     category##_identity<type> identity_traits<type>::identity(name);
@@ -45,6 +48,7 @@ namespace df {
     STL_OPAQUE_IDENTITY_TRAITS(condition_variable);
     STL_OPAQUE_IDENTITY_TRAITS(fstream);
     STL_OPAQUE_IDENTITY_TRAITS(mutex);
+    STL_OPAQUE_IDENTITY_TRAITS(future<void>);
 
     buffer_container_identity buffer_container_identity::base_instance;
 #endif

library/include/DataIdentity.h

@@ -29,6 +29,7 @@ distribution.
 #include <sstream>
 #include <string>
 #include <vector>
+#include <future>
 
 #include "DataDefs.h"
 
@@ -546,6 +547,9 @@ namespace df
 #define INTEGER_IDENTITY_TRAITS(type) NUMBER_IDENTITY_TRAITS(integer, type)
 #define FLOAT_IDENTITY_TRAITS(type) NUMBER_IDENTITY_TRAITS(float, type)
 
+// the space after the use of "type" in OPAQUE_IDENTITY_TRAITS is _required_
+// without it the macro generates a syntax error when type is a template specification
+
 #define OPAQUE_IDENTITY_TRAITS(type) \
     template<> struct DFHACK_EXPORT identity_traits<type > { \
         static opaque_identity identity; \
@@ -568,6 +572,7 @@ namespace df
     OPAQUE_IDENTITY_TRAITS(std::condition_variable);
     OPAQUE_IDENTITY_TRAITS(std::fstream);
     OPAQUE_IDENTITY_TRAITS(std::mutex);
+    OPAQUE_IDENTITY_TRAITS(std::future<void>);
 
     template<> struct DFHACK_EXPORT identity_traits<bool> {
         static bool_identity identity;