From 8c643e9b7df0a269fd3cd7c2c0be22d5c5a13498 Mon Sep 17 00:00:00 2001
From: hiddenalpha.ch
Date: Sun, 26 Jul 2026 11:57:12 +0200
Subject: Add `HshIdx.swap()`

---
 include/qntan/Qntan.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'include')

diff --git a/include/qntan/Qntan.h b/include/qntan/Qntan.h
index d5e77a7..1dcb005 100644
--- a/include/qntan/Qntan.h
+++ b/include/qntan/Qntan.h
@@ -831,7 +831,7 @@ struct Qntan_HshIdx {
 	size_t (*getCnt)( struct Qntan_HshIdx** );
 	/* Returns number of objects currently present in this collection.
 	 */
-	int  (*addIfNew)( struct Qntan_HshIdx**, void*elm );
+	int  (*addIfNew)( struct Qntan_HshIdx**, void*elm, int idx );
 	/* Returns 0 if 'elm' got copied into the hashtable.
 	 * Returns '-EEXIST' (yep, negated) if 'elm' already exists. Nothing got
 	 * copied anywhere.
@@ -842,6 +842,12 @@ struct Qntan_HshIdx {
 	 * Returns 1 if found object got copied to 'ptrToDst'. The element itelf
 	 * will swill be present in the table.
 	 */
+	int  (*swap)( struct Qntan_HshIdx**, void*elm, void*ptrToDst, int idx );
+	/* Returns 0 if 'elm' got copied into the hashtable.
+	 * Returns 1 is similar to 'Return 0'. BUT: a matching element did already
+	 * exist and this old element now got swapped into 'ptrToDst'.
+	 * Returns negative values to indicate errors.
+	 */
 };
 
 
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