From 1ebc27982163293bbf132a5d44ce79a0d6364bf3 Mon Sep 17 00:00:00 2001
From: James Mitchell <jdm3@st-andrews.ac.uk>
Date: Wed, 19 Nov 2025 13:01:07 +0000
Subject: [PATCH] Fix Perm16::random

---
 include/hpcombi/perm16_impl.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/hpcombi/perm16_impl.hpp b/include/hpcombi/perm16_impl.hpp
index 4d2daed9..267e6b25 100644
--- a/include/hpcombi/perm16_impl.hpp
+++ b/include/hpcombi/perm16_impl.hpp
@@ -162,7 +162,7 @@ inline Perm16 Perm16::random(uint64_t n) {
     static std::mt19937 g(rd());
 
     Perm16 res = one();
-    auto ar = res.as_array();
+    auto &ar = res.as_array();
 
     std::shuffle(ar.begin(), ar.begin() + n, g);
     return res;