From 4ba0ab0a3ccbe4495ed03e0bc7a0af47e67416e6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jon=20Haitz=20Legarreta=20Gorro=C3=B1o?=
 <jon.haitz.legarreta@gmail.com>
Date: Sun, 6 Oct 2024 13:42:13 -0400
Subject: [PATCH] ENH: Add `itk::RelabelComponentImageFilter` signedness check

Add a template instantiation to check that the
`itk::RelabelComponentImageFilter` class does not trigger compiler
warnings with signed pixel types.

Ensures regressions are not introduced after the fix in commit 108a2cf.
---
 .../test/itkRelabelComponentImageFilterTest.cxx             | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Modules/Segmentation/ConnectedComponents/test/itkRelabelComponentImageFilterTest.cxx b/Modules/Segmentation/ConnectedComponents/test/itkRelabelComponentImageFilterTest.cxx
index d505d7d6d93..a49366c774a 100644
--- a/Modules/Segmentation/ConnectedComponents/test/itkRelabelComponentImageFilterTest.cxx
+++ b/Modules/Segmentation/ConnectedComponents/test/itkRelabelComponentImageFilterTest.cxx
@@ -27,6 +27,12 @@
 #include "itkTestingMacros.h"
 
 
+using SignedPixelType = signed short;
+
+// Explicit template instantiation to test compile-time support of signed types
+template class itk::RelabelComponentImageFilter<itk::Image<SignedPixelType>, itk::Image<SignedPixelType>>;
+
+
 int
 itkRelabelComponentImageFilterTest(int argc, char * argv[])
 {