Added reflection support for empty derived types and improved serialization handling for empty member sequences

- Introduced `SYSLIB_SERIALIZE_DERIVED_EMPTY` macro for handling empty derived types
- Enhanced serialization macros to handle empty member sequences gracefully
- Updated CMakeLists to include Boost preprocessor headers in the build process

Author: jglanz

libraries/CMakeLists.txt

@@ -27,4 +27,5 @@ if (ENABLE_NATIVE_COMPILER)
    add_subdirectory(native)
 endif()
 
+file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/boost/include/boost/preprocessor DESTINATION ${BASE_BINARY_DIR}/include/boost)
 file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/meta_refl/include/bluegrass DESTINATION ${BASE_BINARY_DIR}/include)

libraries/sysiolib/core/sysio/serialize.hpp

@@ -1,8 +1,21 @@
+#pragma once
+
 #include <bluegrass/meta/preprocessor.hpp>
+#include <boost/preprocessor/seq/for_each.hpp>
+#include <boost/preprocessor/seq/enum.hpp>
+#include <boost/preprocessor/seq/size.hpp>
+#include <boost/preprocessor/seq/seq.hpp>
+#include <boost/preprocessor/stringize.hpp>
 
 #define SYSLIB_REFLECT_MEMBER_OP( OP, elem ) \
   OP t.elem
 
+#define SYSLIB_REFLECT_MEMBER_COUNT( OP, elem ) \
+  OP 1
+
+#define SYSLIB_REFLECT_SEQ_NIL(x) (x)
+
+//#define SYSLIB_REFLECT_ENUM(...) BLUEGRASS_META_SEQ_ENUM(__VA_ARGS__)
 /**
  *  @defgroup serialize Serialize
  *  @ingroup core
@@ -19,11 +32,13 @@
 #define SYSLIB_SERIALIZE( TYPE,  MEMBERS ) \
  template<typename DataStream> \
  friend DataStream& operator << ( DataStream& ds, const TYPE& t ){ \
-    return ds BLUEGRASS_META_FOREACH_SEQ( SYSLIB_REFLECT_MEMBER_OP, <<, MEMBERS );\
+    uint32_t member_count = 0 BLUEGRASS_META_FOREACH_SEQ( SYSLIB_REFLECT_MEMBER_COUNT, +, MEMBERS ) ; \
+    return member_count == 0 ? ds : (ds BLUEGRASS_META_FOREACH_SEQ( SYSLIB_REFLECT_MEMBER_OP, <<, MEMBERS ));\
  }\
  template<typename DataStream> \
  friend DataStream& operator >> ( DataStream& ds, TYPE& t ){ \
-    return ds BLUEGRASS_META_FOREACH_SEQ( SYSLIB_REFLECT_MEMBER_OP, >>, MEMBERS );\
+    uint32_t member_count = 0 BLUEGRASS_META_FOREACH_SEQ( SYSLIB_REFLECT_MEMBER_COUNT, +, MEMBERS ) ; \
+    return member_count == 0 ? ds : (ds BLUEGRASS_META_FOREACH_SEQ( SYSLIB_REFLECT_MEMBER_OP, >>, MEMBERS ));\
  }
 
 /**
@@ -39,10 +54,24 @@
  template<typename DataStream> \
  friend DataStream& operator << ( DataStream& ds, const TYPE& t ){ \
     ds << static_cast<const BASE&>(t); \
-    return ds BLUEGRASS_META_FOREACH_SEQ( SYSLIB_REFLECT_MEMBER_OP, <<, MEMBERS );\
+    uint32_t member_count = 0 BLUEGRASS_META_FOREACH_SEQ( SYSLIB_REFLECT_MEMBER_COUNT, +, MEMBERS ); \
+    return member_count == 0 ? ds : (ds BLUEGRASS_META_FOREACH_SEQ( SYSLIB_REFLECT_MEMBER_OP, <<, MEMBERS ));\
  }\
  template<typename DataStream> \
  friend DataStream& operator >> ( DataStream& ds, TYPE& t ){ \
     ds >> static_cast<BASE&>(t); \
-    return ds BLUEGRASS_META_FOREACH_SEQ( SYSLIB_REFLECT_MEMBER_OP, >>, MEMBERS );\
+    uint32_t member_count = 0 BLUEGRASS_META_FOREACH_SEQ( SYSLIB_REFLECT_MEMBER_COUNT, +, MEMBERS ); \
+    return member_count == 0 ? ds : (ds BLUEGRASS_META_FOREACH_SEQ( SYSLIB_REFLECT_MEMBER_OP, >>, MEMBERS ));\
  }
+
+#define SYSLIB_SERIALIZE_DERIVED_EMPTY( TYPE, BASE ) \
+template<typename DataStream> \
+friend DataStream& operator << ( DataStream& ds, const TYPE& t ){ \
+ds << static_cast<const BASE&>(t); \
+return ds;\
+}\
+template<typename DataStream> \
+friend DataStream& operator >> ( DataStream& ds, TYPE& t ){ \
+ds >> static_cast<BASE&>(t); \
+return ds;\
+}