From 7d5a9b41aaf6878f9ff27aa0fb68c6de4a409a01 Mon Sep 17 00:00:00 2001
From: daizhirui <daizhirui@hotmail.com>
Date: Thu, 6 Feb 2025 00:56:52 -0800
Subject: [PATCH] Remove some maybe-uninitialized warnings

In the Eigen matrix type_caster, resize the matrix instead of assigning with a new one when the matrix size needs to be adjusted.

This can remove lots of compiling warnings about "maybe-uninitialized".
---
 include/pybind11/eigen/matrix.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/pybind11/eigen/matrix.h b/include/pybind11/eigen/matrix.h
index 5cf1f0a2a..a62c542d5 100644
--- a/include/pybind11/eigen/matrix.h
+++ b/include/pybind11/eigen/matrix.h
@@ -317,7 +317,7 @@ struct type_caster<Type, enable_if_t<is_eigen_dense_plain<Type>::value>> {
         }
 
         // Allocate the new type, then build a numpy reference into it
-        value = Type(fits.rows, fits.cols);
+        value.resize(fits.rows, fits.cols);
         auto ref = reinterpret_steal<array>(eigen_ref_array<props>(value));
         if (dims == 1) {
             ref = ref.squeeze();