From 76b13c42bcaa1cdf49dcd8032d8b6d368000e612 Mon Sep 17 00:00:00 2001
From: Adam Wulkiewicz <adam.wulkiewicz@gmail.com>
Date: Mon, 16 Jun 2014 13:04:22 +0200
Subject: [PATCH] [util][math] Add the conversion to double (C++11 approach)
 before passing the integral argument to std::sqrt()

---
 include/boost/geometry/util/math.hpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/boost/geometry/util/math.hpp b/include/boost/geometry/util/math.hpp
index 762e0b4f8..89f4578c0 100644
--- a/include/boost/geometry/util/math.hpp
+++ b/include/boost/geometry/util/math.hpp
@@ -25,6 +25,7 @@
 #include <boost/type_traits/is_fundamental.hpp>
 
 #include <boost/math/constants/constants.hpp>
+#include <boost/numeric/conversion/cast.hpp>
 
 #include <boost/geometry/util/select_most_precise.hpp>
 
@@ -154,7 +155,7 @@ struct square_root<T, true>
         // Note: in C++98 the only other possibility is double;
         //       in C++11 there are also overloads for integral types;
         //       this specialization works for those as well.
-        return std::sqrt(value);
+        return std::sqrt(boost::numeric_cast<double>(value));
     }
 };