From d3da2c8b22d8f84e84adcce329e3b97a6a063e10 Mon Sep 17 00:00:00 2001
From: phkahler <14852918+phkahler@users.noreply.github.com>
Date: Thu, 27 Aug 2020 16:39:03 -0400
Subject: [PATCH] Performance: Don't call std::inplace_merge for
 IdList::AddAndAssignID() via Add() because it is redundant.

---
 src/dsc.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/dsc.h b/src/dsc.h
index 5a431a7..f07d932 100644
--- a/src/dsc.h
+++ b/src/dsc.h
@@ -368,7 +368,11 @@ public:
 
     H AddAndAssignId(T *t) {
         t->h.v = (MaximumId() + 1);
-        Add(t);
+        AllocForOneMore();
+
+        // Copy-construct at the end of the list.
+        new(&elem[n]) T(*t);
+        ++n;
 
         return t->h;
     }