feat: for scikit-hep/uproot5#1229 (#154)

* feat: for scikit-hep/uproot5#1229

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

dev/make-root/uproot_issue_1229.C

@@ -0,0 +1,40 @@
+#include <TFile.h>
+#include <TObject.h>
+#include <TTree.h>
+
+class TFooMember : public TObject {
+public:
+  TFooMember(int _value)
+    : value(_value)
+  {};
+
+  int value;
+
+ClassDef(TFooMember, 1);
+};
+
+class TFoo : public TObject {
+public:
+  TFoo(int value_for_member, int value_for_const_member)
+    : pointer{new TFooMember(value_for_member)}
+    , const_pointer{new TFooMember(value_for_const_member)}
+  {};
+
+  TFooMember *pointer;
+  const TFooMember *const_pointer;
+
+ClassDef(TFoo, 1);
+};
+
+// Streaming interpreted classes is not supported, so this has to be ran with ACLiC:
+//
+//   root -lbq uproot_issue_1229.C+
+//
+void uproot_issue_1229() {
+  TFile f("uproot-issue-1229.root", "RECREATE");
+  TTree tree;
+  TFoo foo(123, 321);
+  tree.Branch("branch", &foo);
+  tree.Fill();
+  tree.Write("tree");
+}