make ttg::buffer and device_coro's value_t serializable by boost

Author: evaleev

tests/unit/device_coro.cc

@@ -3,19 +3,22 @@
 #include "ttg.h"
 #include "ttg/view.h"
 
+#include "ttg/serialization.h"
+
 #include "cuda_kernel.h"
 
 struct value_t {
   ttg::buffer<double> db; // TODO: rename
   int quark;
 
   template<typename Archive>
-  void ttg_serialize(Archive& ar) {
+  void serialize(Archive& ar, const unsigned int version) {
     ar& quark;
     ar& db; // input:
   }
 };
 
+#ifdef TTG_SERIALIZATION_SUPPORTS_MADNESS
 /* devicebuf is non-POD so provide serialization
  * information for members not a devicebuf */
 namespace madness::archive {
@@ -24,7 +27,7 @@ namespace madness::archive {
     static inline void serialize(const Archive& ar, value_t& obj) { ar& obj.quark & obj.db; };
   };
 }  // namespace madness::archive
-
+#endif  // TTG_SERIALIZATION_SUPPORTS_MADNESS
 
 TEST_CASE("Device", "coro") {
 

ttg/ttg/parsec/buffer.h

@@ -349,6 +349,25 @@ struct buffer {
 
   /* serialization support */
 
+#ifdef TTG_SERIALIZATION_SUPPORTS_BOOST
+  template <typename Archive>
+  void serialize(Archive& ar, const unsigned int version) {
+    if constexpr (ttg::detail::is_output_archive_v<Archive>) {
+      std::size_t s = size();
+      ar& s;
+      assert(m_ttg_copy != nullptr); // only tracked objects allowed
+      m_ttg_copy->iovec_add(ttg::iovec{s*sizeof(T), current_device_ptr()});
+    } else {
+      std::size_t s;
+      ar & s;
+      /* initialize internal pointers and then reset */
+      reset(s);
+      assert(m_ttg_copy != nullptr); // only tracked objects allowed
+      m_ttg_copy->iovec_add(ttg::iovec{s*sizeof(T), current_device_ptr()});
+    }
+  }
+#endif // TTG_SERIALIZATION_SUPPORTS_BOOST
+
 #ifdef TTG_SERIALIZATION_SUPPORTS_CEREAL
   template <class Archive>
   std::enable_if_t<std::is_base_of_v<cereal::detail::InputArchiveBase, Archive> ||