From 6e078989da6b1ebffeea7295897a53d2723f1c7b Mon Sep 17 00:00:00 2001
From: mingwugmail <mingwu@gmail.com>
Date: Sat, 25 Jun 2022 14:25:04 -0400
Subject: [PATCH] add T dup(T)(T obj) for shallowClone

---
 source/jdiutil/memory.d | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/source/jdiutil/memory.d b/source/jdiutil/memory.d
index 8d8d524..d8a2690 100644
--- a/source/jdiutil/memory.d
+++ b/source/jdiutil/memory.d
@@ -98,3 +98,22 @@ unittest {
   main();
 
 }
+
+/* ========================================================================== *\
+\* ========================================================================== */
+// from: https://forum.dlang.org/post/acafsosotrjdswwuklob@forum.dlang.org
+// use the same name as array.dup https://dlang.org/spec/arrays.html
+extern (C) Object _d_newclass(TypeInfo_Class ci);
+
+T dup(T)(T obj) {  // shallowClone
+    if (obj is null)
+        return null;
+    ClassInfo ci = obj.classinfo;
+    size_t start = Object.classinfo.m_init.length;
+    size_t end = ci.m_init.length;
+    T clone = cast(T)_d_newclass(ci);
+    (cast(void*)clone)[start .. end] = (cast(void*)obj)[start .. end];
+    return clone;
+}
+
+