diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index 8b1b7f65d..2ea2d830f 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -62,6 +62,7 @@ set(MAIN_SOURCES
     ColorText.cpp
     CompilerWorkAround.cpp
     DataDefs.cpp
+    DataIdentity.cpp
     Debug.cpp
     Error.cpp
     VTableInterpose.cpp
@@ -71,7 +72,6 @@ set(MAIN_SOURCES
     LuaApi.cpp
     DataStatics.cpp
     DataStaticsCtor.cpp
-    DataStaticsFields.cpp
     MiscUtils.cpp
     Types.cpp
     PluginManager.cpp
@@ -186,8 +186,7 @@ foreach(GROUP other a b c d e f g h i j k l m n o p q r s t u v w x y z)
         set(STATIC_FIELDS_INC_FILENAME "df/static.fields-${GROUP}.inc")
     endif()
     file(WRITE ${STATIC_FIELDS_FILENAME}.tmp
-        "#define STATIC_FIELDS_GROUP\n"
-        "#include \"../DataStaticsFields.cpp\"\n"
+        "#include \"DataStaticsFields.inc\"\n"
         "#include \"${STATIC_FIELDS_INC_FILENAME}\"\n"
     )
     execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different
@@ -294,15 +293,15 @@ add_custom_target(generate_headers
 if(REMOVE_SYMBOLS_FROM_DF_STUBS)
     if(UNIX)
         # Don't produce debug info for generated stubs
-        set_source_files_properties(DataStatics.cpp DataStaticsCtor.cpp DataStaticsFields.cpp ${STATIC_FIELDS_FILES}
+        set_source_files_properties(DataStatics.cpp DataStaticsCtor.cpp ${STATIC_FIELDS_FILES}
             PROPERTIES COMPILE_FLAGS "-g0 -O1")
     else(WIN32)
-        set_source_files_properties(DataStatics.cpp DataStaticsCtor.cpp DataStaticsFields.cpp ${STATIC_FIELDS_FILES}
+        set_source_files_properties(DataStatics.cpp DataStaticsCtor.cpp ${STATIC_FIELDS_FILES}
             PROPERTIES COMPILE_FLAGS "/O1 /bigobj")
     endif()
 else()
     if(WIN32)
-        set_source_files_properties(DataStatics.cpp DataStaticsCtor.cpp DataStaticsFields.cpp ${STATIC_FIELDS_FILES}
+        set_source_files_properties(DataStatics.cpp DataStaticsCtor.cpp ${STATIC_FIELDS_FILES}
             PROPERTIES COMPILE_FLAGS "/Od /bigobj")
     endif()
 endif()
diff --git a/library/DataStaticsFields.cpp b/library/DataIdentity.cpp
similarity index 61%
rename from library/DataStaticsFields.cpp
rename to library/DataIdentity.cpp
index 8318b523d..03851520c 100644
--- a/library/DataStaticsFields.cpp
+++ b/library/DataIdentity.cpp
@@ -1,22 +1,22 @@
 #include <stddef.h>
 
+#include <condition_variable>
 #include <fstream>
-
-#ifndef STATIC_FIELDS_GROUP
-#include "DataDefs.h"
-#endif
+#include <mutex>
+#include <string>
+#include <vector>
 
 #include "DataFuncs.h"
-
-#ifdef __GNUC__
-#pragma GCC diagnostic ignored "-Winvalid-offsetof"
-#endif
+#include "DataIdentity.h"
 
 namespace df {
 #define NUMBER_IDENTITY_TRAITS(category, type, name) \
     category##_identity<type> identity_traits<type>::identity(name);
 #define INTEGER_IDENTITY_TRAITS(type, name) NUMBER_IDENTITY_TRAITS(integer, type, name)
 #define FLOAT_IDENTITY_TRAITS(type) NUMBER_IDENTITY_TRAITS(float, type, #type)
+#define OPAQUE_IDENTITY_TRAITS_NAME(type, name) \
+    opaque_identity identity_traits<type>::identity(sizeof(type), allocator_noassign_fn<type>, name)
+#define STL_OPAQUE_IDENTITY_TRAITS(type) OPAQUE_IDENTITY_TRAITS_NAME(std::type, #type)
 
 #ifndef STATIC_FIELDS_GROUP
     INTEGER_IDENTITY_TRAITS(char,               "char");
@@ -42,25 +42,10 @@ namespace df {
     stl_bit_vector_identity identity_traits<std::vector<bool> >::identity;
     bit_array_identity identity_traits<BitArray<int> >::identity;
 
-    static void *fstream_allocator_fn(void *out, const void *in) {
-        if (out) { /* *(T*)out = *(const T*)in;*/ return NULL; }
-        else if (in) { delete (std::fstream*)in; return (std::fstream*)in; }
-        else return new std::fstream();
-    }
-    opaque_identity identity_traits<std::fstream>::identity(
-        sizeof(std::fstream), fstream_allocator_fn, "fstream");
+    STL_OPAQUE_IDENTITY_TRAITS(condition_variable);
+    STL_OPAQUE_IDENTITY_TRAITS(fstream);
+    STL_OPAQUE_IDENTITY_TRAITS(mutex);
 
     buffer_container_identity buffer_container_identity::base_instance;
 #endif
-#undef NUMBER_IDENTITY_TRAITS
-#undef INTEGER_IDENTITY_TRAITS
-#undef FLOAT_IDENTITY_TRAITS
 }
-
-#define TID(type) (&identity_traits< type >::identity)
-
-#define FLD(mode, name) struct_field_info::mode, #name, offsetof(CUR_STRUCT, name)
-#define GFLD(mode, name) struct_field_info::mode, #name, (size_t)&df::global::name
-#define METHOD(mode, name) struct_field_info::mode, #name, 0, wrap_function(&CUR_STRUCT::name)
-#define METHOD_N(mode, func, name) struct_field_info::mode, #name, 0, wrap_function(&CUR_STRUCT::func)
-#define FLD_END struct_field_info::END
diff --git a/library/include/DataDefs.h b/library/include/DataDefs.h
index 174156e76..e03e9a0a8 100644
--- a/library/include/DataDefs.h
+++ b/library/include/DataDefs.h
@@ -497,11 +497,29 @@ namespace df
     using DFHack::DfLinkedList;
     using DFHack::DfOtherVectors;
 
+    template<class T>
+    typename std::enable_if<
+        std::is_copy_assignable<T>::value,
+        void*
+    >::type allocator_try_assign(void *out, const void *in) {
+        *(T*)out = *(const T*)in;
+        return out;
+    }
+
+    template<class T>
+    typename std::enable_if<
+        !std::is_copy_assignable<T>::value,
+        void*
+    >::type allocator_try_assign(void *out, const void *in) {
+        // assignment is not possible; do nothing
+        return NULL;
+    }
+
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wdelete-non-virtual-dtor"
     template<class T>
     void *allocator_fn(void *out, const void *in) {
-        if (out) { *(T*)out = *(const T*)in; return out; }
+        if (out) { return allocator_try_assign<T>(out, in); }
         else if (in) { delete (T*)in; return (T*)in; }
         else return new T();
     }
@@ -514,6 +532,13 @@ namespace df
         else return new T();
     }
 
+    template<class T>
+    void *allocator_noassign_fn(void *out, const void *in) {
+        if (out) { return NULL; }
+        else if (in) { delete (T*)in; return (T*)in; }
+        else return new T();
+    }
+
     template<class T>
     struct identity_traits {
         static compound_identity *get() { return &T::_identity; }
diff --git a/library/include/DataIdentity.h b/library/include/DataIdentity.h
index fd47429b9..be5466444 100644
--- a/library/include/DataIdentity.h
+++ b/library/include/DataIdentity.h
@@ -25,13 +25,18 @@ distribution.
 #pragma once
 
 #include <deque>
-#include <string>
+#include <map>
 #include <sstream>
+#include <string>
 #include <vector>
-#include <map>
 
 #include "DataDefs.h"
 
+namespace std {
+    class condition_variable;
+    class mutex;
+};
+
 /*
  * Definitions of DFHack namespace structs used by generated headers.
  */
@@ -541,6 +546,12 @@ namespace df
 #define INTEGER_IDENTITY_TRAITS(type) NUMBER_IDENTITY_TRAITS(integer, type)
 #define FLOAT_IDENTITY_TRAITS(type) NUMBER_IDENTITY_TRAITS(float, type)
 
+#define OPAQUE_IDENTITY_TRAITS(type) \
+    template<> struct DFHACK_EXPORT identity_traits<type> { \
+        static opaque_identity identity; \
+        static opaque_identity *get() { return &identity; } \
+    };
+
     INTEGER_IDENTITY_TRAITS(char);
     INTEGER_IDENTITY_TRAITS(signed char);
     INTEGER_IDENTITY_TRAITS(unsigned char);
@@ -554,6 +565,9 @@ namespace df
     INTEGER_IDENTITY_TRAITS(unsigned long long);
     FLOAT_IDENTITY_TRAITS(float);
     FLOAT_IDENTITY_TRAITS(double);
+    OPAQUE_IDENTITY_TRAITS(std::condition_variable);
+    OPAQUE_IDENTITY_TRAITS(std::fstream);
+    OPAQUE_IDENTITY_TRAITS(std::mutex);
 
     template<> struct DFHACK_EXPORT identity_traits<bool> {
         static bool_identity identity;
@@ -565,11 +579,6 @@ namespace df
         static stl_string_identity *get() { return &identity; }
     };
 
-    template<> struct DFHACK_EXPORT identity_traits<std::fstream> {
-        static opaque_identity identity;
-        static opaque_identity *get() { return &identity; }
-    };
-
     template<> struct DFHACK_EXPORT identity_traits<char*> {
         static ptr_string_identity identity;
         static ptr_string_identity *get() { return &identity; }
@@ -598,6 +607,7 @@ namespace df
 #undef NUMBER_IDENTITY_TRAITS
 #undef INTEGER_IDENTITY_TRAITS
 #undef FLOAT_IDENTITY_TRAITS
+#undef OPAQUE_IDENTITY_TRAITS
 
     // Container declarations
 
diff --git a/library/include/DataStaticsFields.inc b/library/include/DataStaticsFields.inc
new file mode 100644
index 000000000..97a036b58
--- /dev/null
+++ b/library/include/DataStaticsFields.inc
@@ -0,0 +1,15 @@
+#include <stddef.h>
+
+#include "DataFuncs.h"
+
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-Winvalid-offsetof"
+#endif
+
+#define TID(type) (&identity_traits< type >::identity)
+
+#define FLD(mode, name) struct_field_info::mode, #name, offsetof(CUR_STRUCT, name)
+#define GFLD(mode, name) struct_field_info::mode, #name, (size_t)&df::global::name
+#define METHOD(mode, name) struct_field_info::mode, #name, 0, wrap_function(&CUR_STRUCT::name)
+#define METHOD_N(mode, func, name) struct_field_info::mode, #name, 0, wrap_function(&CUR_STRUCT::func)
+#define FLD_END struct_field_info::END
diff --git a/library/modules/Screen.cpp b/library/modules/Screen.cpp
index c7ef88c60..2ee91a089 100644
--- a/library/modules/Screen.cpp
+++ b/library/modules/Screen.cpp
@@ -1092,8 +1092,7 @@ df::plant *dfhack_lua_viewscreen::getSelectedPlant()
     return Lua::GetDFObject<df::plant>(Lua::Core::State, -1);
 }
 
-#define STATIC_FIELDS_GROUP
-#include "../DataStaticsFields.cpp"
+#include "DataStaticsFields.inc"
 
 using df::identity_traits;