zoomedit: Verallgemeinerte Level-Objekte implementiert.

1 files changed, 46 insertions, 0 deletions

diff --git a/SharedPtr.h b/SharedPtr.h
new file mode 100644
index 0000000..1b5d2bc
--- /dev/null
+++ b/SharedPtr.h
@@ -0,0 +1,46 @@
+#ifndef SHAREDPTR_H_
+#define SHAREDPTR_H_
+
+template <class T>
+class SharedPtr {
+  private:
+    class Counter {
+      public:
+        Counter(T *o) : object(o), refCount(1) {}
+        ~Counter() {delete object;}
+        
+        T *object;
+        unsigned int refCount;
+    };
+    
+    Counter *counter;
+    
+  public:
+    SharedPtr(T *o) : counter(new Counter(o)) {}
+    
+    SharedPtr(const SharedPtr<T> &c) : counter(c.counter) {
+      counter->refCount++;
+    }
+    
+    virtual ~SharedPtr() {
+      if(--counter->refCount == 0)
+        delete counter;
+    }
+    
+    SharedPtr<T>& operator=(const SharedPtr<T>& c) {
+      c.counter->refCount++;
+      if(--counter->refCount == 0)
+        delete counter;
+      
+      counter = c.counter;
+      return *this;
+    }
+    
+    T* operator->() {return counter->object;}
+    T& operator*() {return *counter->object;}
+    
+    const T* operator->() const {return counter->object;}
+    const T& operator*() const {return *counter->object;}
+};
+
+#endif /*SHAREDPTR_H_*/