[deploy] support holding objects

src/kiwano/base/ObjectBase.cpp

@@ -87,6 +87,7 @@ ObjectBase::ObjectBase()
     , name_(nullptr)
     , user_data_(nullptr)
     , status_(nullptr)
+    , holdings_(nullptr)
     , id_(++last_object_id)
 {
 #ifdef KGE_DEBUG
@@ -104,6 +105,12 @@ ObjectBase::~ObjectBase()
 
     ClearStatus();
 
+    if (holdings_)
+    {
+        delete holdings_;
+        holdings_ = nullptr;
+    }
+
 #ifdef KGE_DEBUG
     ObjectBase::RemoveObjectFromTracingList(this);
 #endif
@@ -119,6 +126,23 @@ void ObjectBase::SetUserData(void* data)
     user_data_ = data;
 }
 
+void ObjectBase::Hold(ObjectBasePtr other)
+{
+    if (!holdings_)
+    {
+        holdings_ = new Set<ObjectBasePtr>;
+    }
+    holdings_->insert(other);
+}
+
+void ObjectBase::Unhold(ObjectBasePtr other)
+{
+    if (holdings_)
+    {
+        holdings_->erase(other);
+    }
+}
+
 void ObjectBase::SetName(const String& name)
 {
     if (IsName(name))

src/kiwano/base/ObjectBase.h

@@ -161,8 +161,19 @@ public:
 
     /// \~chinese
     /// @brief 设置用户数据
+    /// @param data 数据指针
     void SetUserData(void* data);
 
+    /// \~chinese
+    /// @brief 持有一个对象并管理其生命周期
+    /// @param other 对象指针
+    void Hold(ObjectBasePtr other);
+
+    /// \~chinese
+    /// @brief 放弃持有的对象
+    /// @param other 对象指针
+    void Unhold(ObjectBasePtr other);
+
     /// \~chinese
     /// @brief 获取对象ID
     uint64_t GetObjectID() const;
@@ -233,6 +244,7 @@ private:
     void*   user_data_;
 
     ObjectStatus*       status_;
+    Set<ObjectBasePtr>* holdings_;
 };
 
 inline String ObjectBase::GetName() const