From 74993e2a94f9957e9ffb93a012a5d8b8573d9aaf Mon Sep 17 00:00:00 2001
From: tsjost <vcs@tsjo.st>
Date: Tue, 12 Oct 2021 20:05:11 +0200
Subject: [PATCH] Re-use the same random engine

as per https://github.com/rwengine/openrw/pull/682#discussion_r249476939
---
 tests/test_Config.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/tests/test_Config.cpp b/tests/test_Config.cpp
index 5784c60f..34f7e8ce 100644
--- a/tests/test_Config.cpp
+++ b/tests/test_Config.cpp
@@ -92,17 +92,20 @@ protected:
     }
 
 private:
+    static std::default_random_engine& getRandomEngine() {
+        static std::default_random_engine defaultRandomEngine = std::default_random_engine(std::random_device{}());
+        return defaultRandomEngine;
+    }
     static std::string gen_random(size_t len) {
         constexpr std::string_view alphanum =
             "0123456789"
             "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
             "abcdefghijklmnopqrstuvwxyz";
-        std::default_random_engine reng(std::random_device{}());
         std::uniform_int_distribution<size_t> dist(0u, alphanum.size());
         std::string res;
         res.reserve(len);
         std::generate_n(std::back_inserter(res), len, [&]() {
-            return alphanum[dist(reng)];
+            return alphanum[dist(getRandomEngine())];
         });
         return res;
     }