From aa3940f16d9f3704ad92d1cab5be48cb847c77bd Mon Sep 17 00:00:00 2001
From: Tim Wojtulewicz <tim@corelight.com>
Date: Tue, 2 Sep 2025 16:51:23 +0000
Subject: [PATCH] Use std::numbers::pi instead of hard-coded value

---
 src/zeek.bif                                       | 5 +++--
 testing/btest/Baseline/bifs.haversine_distance/out | 2 +-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/zeek.bif b/src/zeek.bif
index a70d5f11f1..961ebca1ee 100644
--- a/src/zeek.bif
+++ b/src/zeek.bif
@@ -9,13 +9,14 @@
 
 %%{ // C++ segment
 #include <sys/stat.h>
-#include <string>
 #include <algorithm>
 #include <cinttypes>
 #include <cmath>
 #include <cstdio>
 #include <cstring>
 #include <ctime>
+#include <numbers>
+#include <string>
 #include <vector>
 
 #include "zeek/digest.h"
@@ -4222,7 +4223,7 @@ function blocking_lookup_hostname%(host: string%) : addr_set
 ## .. zeek:see:: haversine_distance_ip
 function haversine_distance%(lat1: double, long1: double, lat2: double, long2: double%): double
 	%{
-	const double PI = 3.14159;
+	const double PI = std::numbers::pi;
 	const double RADIUS = 3958.8;  // Earth's radius in miles.
 
 	double s1 = sin((lat2 - lat1) * PI/360);
diff --git a/testing/btest/Baseline/bifs.haversine_distance/out b/testing/btest/Baseline/bifs.haversine_distance/out
index 280113f884..50022c3d80 100644
--- a/testing/btest/Baseline/bifs.haversine_distance/out
+++ b/testing/btest/Baseline/bifs.haversine_distance/out
@@ -3,6 +3,6 @@
 5.8481e+03
 1.9193e-02
 1.5136e-02
-9.2419e-01
+9.0763e-01
 1.2437e+04
 1.2437e+04