Initial commit

engine/core/src/GlobalVectorItem.hpp

@@ -0,0 +1,70 @@
+#pragma once
+
+
+namespace Aya
+{
+
+struct GlobalVectorItemBase
+{
+    bool valid;
+    GlobalVectorItemBase()
+        : valid(false){};
+};
+
+// this class manages a sparse static array.
+// allocate one of these "smartptr-like" classes to get the next available entry in the list.
+// T should derive from GlobalVectorItemBase
+template<class T>
+class GlobalVectorItemPtr
+{
+    T* p;
+    T* newp;
+
+public:
+    GlobalVectorItemPtr(T* list, size_t count)
+        : p(0)
+        , newp(0)
+    {
+        for (size_t i = 0; i < count; ++i, ++list)
+        {
+            if (!list->valid)
+            {
+                p = list;
+                p->valid = true;
+                return;
+            }
+        }
+        // out of space. just allocate one.
+
+        newp = new T();
+        p = newp;
+    }
+
+    ~GlobalVectorItemPtr()
+    {
+        if (newp)
+        {
+            delete newp;
+            newp = 0;
+            p = 0;
+        }
+        else
+        {
+            // free slot.
+            p->valid = false;
+            p = 0;
+        }
+    }
+
+
+    T* operator->()
+    {
+        return this->p;
+    }
+
+    T* get()
+    {
+        return this->p;
+    }
+};
+} // namespace Aya