From 5e7c8f03827e0b8f33a126eb23f906fdb9e5cb0f Mon Sep 17 00:00:00 2001
From: Alejandro Hernandez Cordero <ahcorde@gmail.com>
Date: Wed, 17 Jun 2026 13:28:07 +0200
Subject: [PATCH] constrain calculate_stddev with std::ranges::input_range +
 std::is_arithmetic_v

Signed-off-by: Alejandro Hernandez Cordero <ahcorde@gmail.com>
---
 rttest/include/rttest/math_utils.hpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/rttest/include/rttest/math_utils.hpp b/rttest/include/rttest/math_utils.hpp
index 0c617e9..e5c3501 100644
--- a/rttest/include/rttest/math_utils.hpp
+++ b/rttest/include/rttest/math_utils.hpp
@@ -18,10 +18,13 @@
 #include <algorithm>
 #include <cmath>
 #include <numeric>
+#include <ranges>
+#include <type_traits>
 #include <vector>
 
-template<typename container>
-double calculate_stddev(const container & vec)
+template<std::ranges::input_range Container>
+  requires std::is_arithmetic_v<std::ranges::range_value_t<Container>>
+double calculate_stddev(const Container & vec)
 {
   double n = vec.size();
   double mean = std::accumulate(