diff --git a/src/domino/DataDomino.hpp b/src/domino/DataDomino.hpp
index bb6cfe3..72bbddf 100644
--- a/src/domino/DataDomino.hpp
+++ b/src/domino/DataDomino.hpp
@@ -13,7 +13,6 @@
 #pragma once
 
 #include <unordered_map>
-#include <memory>  // make_shared
 
 #include "UniLog.hpp"
 #include "UniPtr.hpp"
diff --git a/src/msg_self/MsgSelf.hpp b/src/msg_self/MsgSelf.hpp
index 0a9526b..7e8fc86 100644
--- a/src/msg_self/MsgSelf.hpp
+++ b/src/msg_self/MsgSelf.hpp
@@ -39,7 +39,6 @@
 #pragma once
 
 #include <functional>
-#include <memory>  // shared_ptr
 #include <deque>
 
 #include "UniLog.hpp"
@@ -73,7 +72,7 @@ using SharedMsgCB  = shared_ptr<MsgCB>;
 class MsgSelf : public UniLog
 {
 public:
-    MsgSelf(const LogName& aUniLogName = ULN_DEFAULT) : UniLog(aUniLogName) {}
+    explicit MsgSelf(const LogName& aUniLogName = ULN_DEFAULT) : UniLog(aUniLogName) {}
     ~MsgSelf() { if (nMsg_) WRN("discard nMsg=" << nMsg_); }
 
     void   newMsg(const MsgCB&, const EMsgPriority = EMsgPri_NORM);  // can't withdraw CB but easier usage
diff --git a/src/safe_mem/SafePtr.hpp b/src/safe_mem/SafePtr.hpp
index 178a8e6..642519e 100644
--- a/src/safe_mem/SafePtr.hpp
+++ b/src/safe_mem/SafePtr.hpp
@@ -9,10 +9,10 @@
 //   . ms & google: ~70% safety defects caused by mem safe issue
 // - REQ: this class is to enhance safety of shared_ptr:
 //   . safe create   : null or make_safe only (not allow unsafe create eg via raw ptr); minor in mem-bug
-//   . safe cast     : only among self, base & void; compile-err is safer than ret-null; major in mem-bug
+//   * safe cast     : only among self, base & void; compile-err is safer than ret-null; major in mem-bug
 //   . safe lifecycle: by shared_ptr (auto mem-mgmt, no use-after-free); major in mem-bug
 //   . safe ptr array: no need since std::array
-//   . safe del      : not support self-deletor that maybe unsafe
+//   . safe del      : not support self-deletor that maybe unsafe; call correct destructor
 //   . loop-ref      : ???
 // - DUTY-BOUND:
 //   . ensure ptr address is safe: legal created, not freed, not wild, etc
@@ -20,7 +20,7 @@
 //   . not SafePtr but T to ensure T's inner safety (eg no exception within T's constructor)
 //   . hope cooperate with tool to ensure/track SafePtr, all T, all code's mem safe
 //
-// - VALUE:
+// - How to solve safety issue:
 //   . way#1: Rust is language-based mem ctrl (heavy)
 //   . way#2: tool (dynamic eg valdrind, or static eg coverity)
 //     . keep legacy code/invest
diff --git a/ut/safe_mem/SafePtrTest.cpp b/ut/safe_mem/SafePtrTest.cpp
index 246f17b..35145a6 100644
--- a/ut/safe_mem/SafePtrTest.cpp
+++ b/ut/safe_mem/SafePtrTest.cpp
@@ -211,6 +211,43 @@ TEST(SafePtrTest, safe_assign)  // operator=() is auto-gen, just simple test 1 c
     EXPECT_EQ(42, *(one.get())) << "REQ: valid get after assigner is reset";
 }
 
+#define DESTRUCT
+// ***********************************************************************************************
+struct TestBase
+{
+    bool& isBaseOver_;
+    explicit TestBase(bool& aExtFlag) : isBaseOver_(aExtFlag) { isBaseOver_ = false; }
+    virtual ~TestBase() { isBaseOver_ = true; }
+};
+TEST(SafePtrTest, GOLD_destructByVoid)
+{
+    bool isBaseOver;
+    SafePtr<void> test = make_safe<TestBase>(isBaseOver);
+    EXPECT_FALSE(isBaseOver) << "correctly constructed";
+
+    test = nullptr;
+    EXPECT_TRUE(isBaseOver) << "REQ: correctly destructed by SafePtr<void>";
+}
+struct TestDerive : public TestBase
+{
+    bool& isDeriveOver_;
+    explicit TestDerive(bool& aBaseFlag, bool& aDeriveFlag)
+        : TestBase(aBaseFlag)
+        , isDeriveOver_(aDeriveFlag)
+    { isDeriveOver_ = false; }
+    ~TestDerive() { isDeriveOver_ = true; }
+};
+TEST(SafePtrTest, GOLD_destructByBase)
+{
+    bool isBaseOver;
+    bool isDeriveOver;
+    SafePtr<TestBase> test = make_safe<TestDerive>(isBaseOver, isDeriveOver);
+    EXPECT_FALSE(isDeriveOver) << "correctly constructed";
+
+    test = nullptr;
+    EXPECT_TRUE(isDeriveOver) << "REQ: correctly destructed by SafePtr<TestBase>";
+}
+
 #define LIKE_SHARED_PTR
 // ***********************************************************************************************
 TEST(SafePtrTest, get_isMemSafe_afterDelOrigin)