From 37dca8d7dfae1599cfadcafa94ed606f5fcf27fd Mon Sep 17 00:00:00 2001
From: Ivan Mogilko <ikm_spb@yahoo.com>
Date: Tue, 4 Mar 2025 21:27:48 +0300
Subject: [PATCH] FIX: std algorithms in Fingers (can't use const static
 member)

---
 Engine/ac/sys_events.cpp | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/Engine/ac/sys_events.cpp b/Engine/ac/sys_events.cpp
index 2e524cc6d2..2a21724e83 100644
--- a/Engine/ac/sys_events.cpp
+++ b/Engine/ac/sys_events.cpp
@@ -607,7 +607,7 @@ struct Fingers
 
     Fingers()
     {
-        std::fill(_fingers.begin(), _fingers.end(), NO_INDEX);
+        std::fill(_fingers.begin(), _fingers.end(), NO_INDEX_REF);
     }
 
     // store fingerId, return given finger index
@@ -616,7 +616,7 @@ struct Fingers
         if (contains(fingerId))
             return NO_INDEX; // invalid, fingerId already present
 
-        auto it = std::find(_fingers.begin(), _fingers.end(), NO_ID);
+        auto it = std::find(_fingers.begin(), _fingers.end(), NO_INDEX_REF);
         if (it == _fingers.end())
             return NO_INDEX; // no slot for new finger
 
@@ -637,13 +637,13 @@ struct Fingers
     {
         int idx = get_index(fingerId);
         assert(idx != NO_INDEX);
-        if (idx != NO_INDEX) {
-            _fingers[idx] = NO_ID;
-        }
+        if (idx != NO_INDEX)
+            _fingers[idx] = NO_INDEX;
     };
 
 private:
-    const SDL_FingerID NO_ID = -1; // std::find reads by reference, can't be static
+    // std algorithms accept args by reference, can't be static
+    const SDL_FingerID NO_INDEX_REF = NO_INDEX;
     std::array<SDL_FingerID, MAX_FINGERS> _fingers {};
 
     bool contains(SDL_FingerID fingerId) const