Changeset 287 in Sophya

Timestamp:

Apr 30, 1999, 8:59:28 PM (26 years ago)

Author:

ansari

Message:

ajoute const smart pointers

File:

• trunk/SophyaLib/BaseTools/rcptr.h (modified) (4 diffs)

trunk/SophyaLib/BaseTools/rcptr.h

@@ -6 +6 @@
 // This implements a very simple "smart pointer" with reference counting.
 // Many refinements are possible
-//  - const propagation
-// ...
 
 // Principle :  use RCPtr<T> instead of T*
@@ -17 +15 @@
 //    can be passed by reference, copied, etc
 // the object is destroyed when the last Xp is destroyed.
+
+// The class RCCPtr<X> is a const smart pointer, to be used like
+// a X const *.
+
+// Eric Aubourg  1999   CEA/DAPNIA/SPP
+
+
+template <class T> class RCCPtr;
 
 template <class T>
@@ -33 +39 @@
   }
 
-  RCPtr<T>& operator = (RCPtr const& other) {
+  RCPtr<T>& operator = (RCPtr<T> const& other) {
     (*cnt)--;
     if (!*cnt) {
@@ -59 +65 @@
   T* x;                  // the object we are referring
   int* cnt;              // how many smart pointers ?
+  friend class RCCPtr<T>;
+};
+
+
+// A const smart pointer
+template <class T>
+class RCCPtr {
+public:
+  RCCPtr(T const* obj=0) {
+    x = obj;
+    cnt = new int;
+    *cnt = 1;
+  }
+  
+  RCCPtr(RCCPtr<T> const& other) {
+    x = other.x;
+    cnt = other.cnt;
+    (*cnt)++;
+  }
+
+  RCCPtr(RCPtr<T> const& other) {
+    x = other.x;
+    cnt = other.cnt;
+    (*cnt)++;
+  }
+
+  RCCPtr<T>& operator = (RCCPtr<T> const& other) {
+    (*cnt)--;
+    if (!*cnt) {
+      delete (T*) x;
+      delete cnt;
+    }
+    x = other.x;
+    cnt = other.cnt;
+    (*cnt)++;
+    return *this;
+  }
+  
+  ~RCCPtr() {
+    (*cnt)--;
+    if (!*cnt) {
+      delete (T*) x;
+      delete cnt;
+    }
+  }
+
+  T const* operator->() {return x;}
+  T const& operator*()  {return *x;}
+
+private:
+  T const * x;           // the object we are referring
+  int* cnt;              // how many smart pointers ?
 };