fix intrinsic problem with refcount

adjust slit menus to deconstruct properly

1 files changed, 39 insertions, 18 deletions

diff --git a/src/FbTk/RefCount.hh b/src/FbTk/RefCount.hh
index ba2a697..ab4c663 100644
--- a/src/FbTk/RefCount.hh
+++ b/src/FbTk/RefCount.hh
@@ -25,6 +25,7 @@
 namespace FbTk {
 
 /// holds a pointer with reference counting, similar to std:auto_ptr
+
 template <typename Pointer>
 class RefCount {
 public:
@@ -43,37 +44,47 @@ public:
     unsigned int usedBy() const { return (m_refcount != 0 ? *m_refcount : 0); }
 #endif
 private:
-    /// increase referense count
+    /// increase reference count
     void incRefCount();
-    /// decrease referense count
+    /// decrease reference count
     void decRefCount();
+    /// decrease refcount count
+    void decRefCountCount();
     Pointer *m_data; ///< data holder
     mutable unsigned int *m_refcount; ///< holds reference counting
+
+    // This one counts the number of active references pointing to the m_refcount data!
+    // when it reaches zero, *then* we can delete it, otherwise someone else might check it.
+    mutable unsigned int *m_refcount_count; ///< holds reference counting
 };
 
 // implementation
 
 template <typename Pointer>
-RefCount<Pointer>::RefCount():m_data(0), m_refcount(new unsigned int(0)) {
+RefCount<Pointer>::RefCount():m_data(0), m_refcount(new unsigned int(0)), m_refcount_count(new unsigned int(1)) {
 
 }
 
 template <typename Pointer>
 RefCount<Pointer>::RefCount(RefCount<Pointer> &copy):
     m_data(copy.m_data),
-    m_refcount(copy.m_refcount) {
+    m_refcount(copy.m_refcount), 
+    m_refcount_count(copy.m_refcount_count) {
+    (*m_refcount_count)++;
     incRefCount();
 }
 
 template <typename Pointer>
-RefCount<Pointer>::RefCount(Pointer *p):m_data(p), m_refcount(new unsigned int(0)) {
+RefCount<Pointer>::RefCount(Pointer *p):m_data(p), m_refcount(new unsigned int(0)), m_refcount_count(new unsigned int(1)) {
     incRefCount();
 }
 
 template <typename Pointer>
 RefCount<Pointer>::RefCount(const RefCount<Pointer> &copy):
     m_data(copy.m_data),
-    m_refcount(copy.m_refcount) {
+    m_refcount(copy.m_refcount),
+    m_refcount_count(copy.m_refcount_count) {
+    (*m_refcount_count)++;
     incRefCount();
 }
 
@@ -86,6 +97,8 @@ template <typename Pointer>
 RefCount<Pointer> &RefCount<Pointer>::operator = (const RefCount<Pointer> &copy) {
     decRefCount(); // dec current ref count
     m_refcount = copy.m_refcount; // set new ref count
+    m_refcount_count = copy.m_refcount_count;
+    (*m_refcount_count)++;
     m_data = copy.m_data; // set new data pointer
     incRefCount(); // inc new ref count 
     return *this;
@@ -96,27 +109,35 @@ RefCount<Pointer> &RefCount<Pointer>::operator = (Pointer *p) {
     decRefCount();
     m_data = p; // set data pointer
     m_refcount = new unsigned int(0); // create new counter
+    m_refcount_count = new unsigned int(1);
     incRefCount();
     return *this;
 }
 
 template <typename Pointer>
 void RefCount<Pointer>::decRefCount() {
-    if (m_refcount == 0)
-        return;
-    if (*m_refcount == 0) { // already zero, then delete refcount
-        delete m_refcount;
-        m_refcount = 0;
-        return;
+    if (m_refcount != 0) {
+        (*m_refcount)--;
+        if (*m_refcount == 0) { // destroy m_data and m_refcount if nobody else is using this
+            if (m_data != 0)
+                delete m_data;
+            m_data = 0;
+        }
     }
-    (*m_refcount)--;
-    if (*m_refcount == 0) { // destroy m_data and m_refcount if nobody else is using this
-        if (m_data != 0)
-            delete m_data;
-        m_data = 0;
+    decRefCountCount();
+}
+
+template <typename Pointer>
+void RefCount<Pointer>::decRefCountCount() {
+    if (*m_refcount_count == 0)
+        return; // shouldnt happen
+    (*m_refcount_count)--;
+    if (*m_refcount_count == 0) { 
         delete m_refcount;
-        m_refcount = 0;
+        delete m_refcount_count;
     }
+    m_refcount = 0;
+    m_refcount_count = 0;
 }
 
 template <typename Pointer>