diff --git a/imgui_internal.h b/imgui_internal.h
index 5904405e8..4d87c4c29 100644
--- a/imgui_internal.h
+++ b/imgui_internal.h
@@ -690,6 +690,8 @@ struct ImSpan
 
     inline void         set(T* data, int size)      { Data = data; DataEnd = data + size; }
     inline void         set(T* data, T* data_end)   { Data = data; DataEnd = data_end; }
+    inline void         clear()                     { Data = DataEnd = NULL; }
+    inline bool         empty() const               { return Data == DataEnd; }
     inline int          size() const                { return (int)(ptrdiff_t)(DataEnd - Data); }
     inline int          size_in_bytes() const       { return (int)(ptrdiff_t)(DataEnd - Data) * (int)sizeof(T); }
     inline T&           operator[](int i)           { T* p = Data + i; IM_ASSERT(p >= Data && p < DataEnd); return *p; }