diff --git a/spine-cpp/spine-cpp/include/spine/Extension.h b/spine-cpp/spine-cpp/include/spine/Extension.h
index 9c024c968..e58f44991 100644
--- a/spine-cpp/spine-cpp/include/spine/Extension.h
+++ b/spine-cpp/spine-cpp/include/spine/Extension.h
@@ -31,30 +31,65 @@
 #ifndef Spine_Extension_h
 #define Spine_Extension_h
 
+#include <stdlib.h>
+
+#define SPINE_EXTENSION (SpineExtension::getInstance())
+
 /* All allocation uses these. */
-#define MALLOC(TYPE,COUNT) ((TYPE*)spineAlloc(sizeof(TYPE) * (COUNT), __FILE__, __LINE__))
-#define NEW(TYPE) ((TYPE*)spineAlloc(sizeof(TYPE), __FILE__, __LINE__))
-#define REALLOC(PTR,TYPE,COUNT) ((TYPE*)spineRealloc(PTR, sizeof(TYPE) * (COUNT), __FILE__, __LINE__))
+#define MALLOC(TYPE,COUNT) ((TYPE*)SPINE_EXTENSION->spineAlloc(sizeof(TYPE) * (COUNT), __FILE__, __LINE__))
+#define NEW(TYPE) ((TYPE*)SPINE_EXTENSION->spineAlloc(sizeof(TYPE), __FILE__, __LINE__))
+#define REALLOC(PTR,TYPE,COUNT) ((TYPE*)SPINE_EXTENSION->spineRealloc(PTR, sizeof(TYPE) * (COUNT), __FILE__, __LINE__))
 
 /* Frees memory. Can be used on const types. */
-#define FREE(VALUE) spineFree((void*)VALUE)
+#define FREE(VALUE) SPINE_EXTENSION->spineFree((void*)VALUE)
 
 /* Call destructor and then frees memory. Can be used on const types. */
-#define DESTROY(TYPE,VALUE) VALUE->~TYPE(); spineFree((void*)VALUE)
-
-#include <stdlib.h>
+#define DESTROY(TYPE,VALUE) VALUE->~TYPE(); SPINE_EXTENSION->spineFree((void*)VALUE)
 
 namespace Spine
 {
-    /// Implement this function to use your own memory allocator.
-    void* spineAlloc(size_t size, const char* file, int line);
+    class SpineExtension
+    {
+    public:
+        static void setInstance(SpineExtension* inSpineExtension);
+        
+        static SpineExtension* getInstance();
+        
+        virtual ~SpineExtension();
+        
+        /// Implement this function to use your own memory allocator
+        virtual void* spineAlloc(size_t size, const char* file, int line) = 0;
+        
+        virtual void* spineRealloc(void* ptr, size_t size, const char* file, int line) = 0;
+        
+        /// If you provide a spineAllocFunc, you should also provide a spineFreeFunc
+        virtual void spineFree(void* mem) = 0;
+        
+        virtual char* spineReadFile(const char* path, int* length);
+        
+    protected:
+        SpineExtension();
+        
+    private:
+        static SpineExtension* _spineExtension;
+    };
     
-    void* spineRealloc(void* ptr, size_t size, const char* file, int line);
-    
-    /// If you implement spineAlloc, you should also implement this function.
-    void spineFree(void* mem);
-    
-    char* spineReadFile(const char* path, int* length);
+    class DefaultSpineExtension : public SpineExtension
+    {
+    public:
+        static DefaultSpineExtension* getInstance();
+        
+        virtual ~DefaultSpineExtension();
+        
+        virtual void* spineAlloc(size_t size, const char* file, int line);
+        
+        virtual void* spineRealloc(void* ptr, size_t size, const char* file, int line);
+        
+        virtual void spineFree(void* mem);
+        
+    protected:
+        DefaultSpineExtension();
+    };
 }
 
 #endif /* Spine_Extension_h */
diff --git a/spine-cpp/spine-cpp/src/spine/Atlas.cpp b/spine-cpp/spine-cpp/src/spine/Atlas.cpp
index bd720f118..369f57a64 100644
--- a/spine-cpp/spine-cpp/src/spine/Atlas.cpp
+++ b/spine-cpp/spine-cpp/src/spine/Atlas.cpp
@@ -53,7 +53,7 @@ namespace Spine
         memcpy(dir, path, dirLength);
         dir[dirLength] = '\0';
 
-        data = spineReadFile(path, &length);
+        data = SPINE_EXTENSION->spineReadFile(path, &length);
         if (data)
         {
             load(data, length, dir);
diff --git a/spine-cpp/spine-cpp/src/spine/Extension.cpp b/spine-cpp/spine-cpp/src/spine/Extension.cpp
index dd52dc6fe..757d44cbe 100644
--- a/spine-cpp/spine-cpp/src/spine/Extension.cpp
+++ b/spine-cpp/spine-cpp/src/spine/Extension.cpp
@@ -30,31 +30,33 @@
 
 #include <spine/Extension.h>
 
-//#include <iostream>
 #include <fstream>
+#include <assert.h>
 
 namespace Spine
 {
-    void* spineAlloc(size_t size, const char* file, int line)
+    SpineExtension* SpineExtension::_spineExtension = NULL;
+    
+    void SpineExtension::setInstance(SpineExtension* inValue)
     {
-        //printf("spineAlloc size: %lu, file: %s, line: %d \n", size, file, line);
+        assert(!_spineExtension);
         
-        return malloc(size);
+        _spineExtension = inValue;
     }
     
-    void* spineRealloc(void* ptr, size_t size, const char* file, int line)
+    SpineExtension* SpineExtension::getInstance()
     {
-        //printf("spineRealloc size: %lu, file: %s, line: %d \n", size, file, line);
+        assert(_spineExtension);
         
-        return realloc(ptr, size);
+        return _spineExtension;
     }
     
-    void spineFree(void* mem)
+    SpineExtension::~SpineExtension()
     {
-        free(mem);
+        // Empty
     }
     
-    char* spineReadFile(const char* path, int* length)
+    char* SpineExtension::spineReadFile(const char* path, int* length)
     {
         char *data;
         FILE *file = fopen(path, "rb");
@@ -70,4 +72,40 @@ namespace Spine
         
         return data;
     }
+    
+    SpineExtension::SpineExtension()
+    {
+        // Empty
+    }
+    
+    DefaultSpineExtension* DefaultSpineExtension::getInstance()
+    {
+        static DefaultSpineExtension ret;
+        return &ret;
+    }
+    
+    DefaultSpineExtension::~DefaultSpineExtension()
+    {
+        // Empty
+    }
+    
+    void* DefaultSpineExtension::spineAlloc(size_t size, const char* file, int line)
+    {
+        return malloc(size);
+    }
+    
+    void* DefaultSpineExtension::spineRealloc(void* ptr, size_t size, const char* file, int line)
+    {
+        return realloc(ptr, size);
+    }
+    
+    void DefaultSpineExtension::spineFree(void* mem)
+    {
+        free(mem);
+    }
+    
+    DefaultSpineExtension::DefaultSpineExtension() : SpineExtension()
+    {
+        // Empty
+    }
 }