diff --git a/BAN/include/BAN/Function.h b/BAN/include/BAN/Function.h
index 861821d8..33e4a361 100644
--- a/BAN/include/BAN/Function.h
+++ b/BAN/include/BAN/Function.h
@@ -64,6 +64,8 @@ namespace BAN
 			memset(m_storage, 0, m_size);
 		}
 
+		static constexpr size_t size() { return m_size; }
+
 	private:
 		struct CallableBase
 		{