+#if defined (G_OVERRIDABLE_ALLOCATORS)
+
+static GMemVTable sGMemVTable = { malloc, realloc, free, calloc };
+
+void
+g_mem_set_vtable (GMemVTable* vtable)
+{
+ sGMemVTable.calloc = vtable->calloc ? vtable->calloc : calloc;
+ sGMemVTable.realloc = vtable->realloc ? vtable->realloc : realloc;
+ sGMemVTable.malloc = vtable->malloc ? vtable->malloc : malloc;
+ sGMemVTable.free = vtable->free ? vtable->free : free;
+}
+#define G_FREE_INTERNAL sGMemVTable.free
+#define G_REALLOC_INTERNAL sGMemVTable.realloc
+#define G_CALLOC_INTERNAL sGMemVTable.calloc
+#define G_MALLOC_INTERNAL sGMemVTable.malloc
+#else
+#define G_FREE_INTERNAL free
+#define G_REALLOC_INTERNAL realloc
+#define G_CALLOC_INTERNAL calloc
+#define G_MALLOC_INTERNAL malloc
+#endif