From e1f42658629ad67ce7cb224a1379d133f61f2e35 Mon Sep 17 00:00:00 2001
From: Jonas Rembser <jonas.rembser@cern.ch>
Date: Sun, 11 Jan 2026 10:25:51 +0100
Subject: [PATCH] [RF] Use TRandom3 in test RooFuncWrapper

Use TRandom3 instead of the `<random>` to get compiler-independent,
reproducible behavior.
---
 roofit/roofitcore/test/testRooFuncWrapper.cxx | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/roofit/roofitcore/test/testRooFuncWrapper.cxx b/roofit/roofitcore/test/testRooFuncWrapper.cxx
index 2ebdf95333f..189e8f2e266 100644
--- a/roofit/roofitcore/test/testRooFuncWrapper.cxx
+++ b/roofit/roofitcore/test/testRooFuncWrapper.cxx
@@ -34,12 +34,12 @@
 #include <RooWorkspace.h>
 
 #include <ROOT/StringUtils.hxx>
+#include <TMath.h>
 #include <TROOT.h>
+#include <TRandom3.h>
 #include <TSystem.h>
-#include <TMath.h>
 
 #include <functional>
-#include <random>
 
 #include "gtest_wrapper.h"
 
@@ -66,13 +66,13 @@ double getNumDerivative(const RooAbsReal &pdf, RooRealVar &var, const RooArgSet
 
 void randomizeParameters(const RooArgSet &parameters)
 {
+   TRandom3 rng(1337);
+
    double lowerBound = -0.1;
    double upperBound = 0.1;
-   std::uniform_real_distribution<double> unif(lowerBound, upperBound);
-   std::default_random_engine re;
 
    for (auto *param : parameters) {
-      double mul = unif(re);
+      double mul = rng.Uniform(lowerBound, upperBound);
 
       auto par = dynamic_cast<RooAbsRealLValue *>(param);
       if (!par)
-- 
2.52.0