From 4793cbfd2014e39c437b815fbf90a5e9b7df8b33 Mon Sep 17 00:00:00 2001
From: skypjack <michele.caini@gmail.com>
Date: Sun, 18 Jan 2026 17:04:29 +0100
Subject: [PATCH] graph: constrain iterator types

---
 src/entt/graph/flow.hpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/entt/graph/flow.hpp b/src/entt/graph/flow.hpp
index f7e5173c8..514393f93 100644
--- a/src/entt/graph/flow.hpp
+++ b/src/entt/graph/flow.hpp
@@ -2,6 +2,7 @@
 #define ENTT_GRAPH_FLOW_HPP
 
 #include <algorithm>
+#include <concepts>
 #include <cstddef>
 #include <functional>
 #include <iterator>
@@ -288,7 +289,7 @@ public:
      * @param last An iterator past the last element of the range of elements.
      * @return This flow builder.
      */
-    template<typename It>
+    template<std::input_iterator It>
     std::enable_if_t<std::is_same_v<std::remove_const_t<typename std::iterator_traits<It>::value_type>, id_type>, basic_flow &>
     ro(It first, It last) {
         for(; first != last; ++first) {
@@ -315,7 +316,7 @@ public:
      * @param last An iterator past the last element of the range of elements.
      * @return This flow builder.
      */
-    template<typename It>
+    template<std::input_iterator It>
     std::enable_if_t<std::is_same_v<std::remove_const_t<typename std::iterator_traits<It>::value_type>, id_type>, basic_flow &>
     rw(It first, It last) {
         for(; first != last; ++first) {