feat: add Boost serialization support for SmartPointer and include standard smart pointer headers

src/Core/SmartPointer.h

@@ -29,10 +29,10 @@
 #include <atomic>
 #include <functional>
 #include <type_traits>
+#include <utility>
 
 #include <boost/serialization/access.hpp>
 #include <boost/serialization/nvp.hpp>
-#include <boost/serialization/split_member.hpp>
 
 namespace uLib {
 
@@ -219,18 +219,49 @@ public:
   }
 
 private:
-  template <typename U> friend class SmartPointer;
   friend class boost::serialization::access;
 
+  template <class Archive>
+  void serialize(Archive &ar, const unsigned int /*version*/) {
+    if (Archive::is_loading::value) {
+      release();
+    }
+    ar &boost::serialization::make_nvp("counter", m_counter);
+    if (Archive::is_loading::value && m_counter) {
+      m_counter->count.fetch_add(1, std::memory_order_relaxed);
+    }
+  }
+
+  struct ReferenceCounter {
+    T *ptr;
+    std::atomic<uint32_t> count;
+    std::function<void(T *)> deleter;
+
+    ReferenceCounter(T *p, uint32_t initial_count = 1)
+        : ptr(p), count(initial_count),
+          deleter([](T *ptr_to_del) { delete ptr_to_del; }) {}
+
+    template <typename D>
+    ReferenceCounter(T *p, D d, uint32_t initial_count = 1)
+        : ptr(p), count(initial_count), deleter(d) {}
+
+    ReferenceCounter()
+        : ptr(nullptr), count(0), deleter([](T *p) { delete p; }) {}
+
+  private:
+    friend class boost::serialization::access;
+    template <class Archive>
+    void serialize(Archive &ar, const unsigned int /*version*/) {
+      ar &boost::serialization::make_nvp("ptr", ptr);
+    }
+  };
+
   ReferenceCounter *m_counter;
 
   void acquire(ReferenceCounter *c) noexcept {
+    m_counter = c;
     if (c) {
-      m_counter = new ReferenceCounter();
-      m_counter->ptr = c->ptr;
-      m_counter->cb = c->cb;
-      if (m_counter->cb)
-        m_counter->cb->count.fetch_add(1, std::memory_order_relaxed);
+      c->count.fetch_add(1, std::memory_order_relaxed);
     }
   }