From 2ccf36b4b9bb0311c38947fa7accaf7661d13013 Mon Sep 17 00:00:00 2001
From: Werner Henze <werner.henze+gitcommits@posteo.de>
Date: Wed, 14 Oct 2020 14:53:43 +0200
Subject: [PATCH] eliminate warning, use narrow_cast instead of static_cast

---
 include/gsl/span | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/gsl/span b/include/gsl/span
index a649cea..6015d85 100644
--- a/include/gsl/span
+++ b/include/gsl/span
@@ -19,6 +19,7 @@
 
 #include <gsl/gsl_assert> // for Expects
 #include <gsl/gsl_byte>   // for byte
+#include <gsl/gsl_util>   // for narrow_cast
 
 #include <array>       // for array
 #include <cstddef>     // for ptrdiff_t, size_t, nullptr_t
@@ -433,14 +434,14 @@ public:
 
     template <std::size_t MyExtent = Extent, std::enable_if_t<MyExtent != dynamic_extent, int> = 0>
     constexpr explicit span(pointer firstElem, pointer lastElem) noexcept
-        : storage_(firstElem, static_cast<std::size_t>(lastElem - firstElem))
+        : storage_(firstElem, gsl::narrow_cast<std::size_t>(lastElem - firstElem))
     {
         Expects(lastElem - firstElem == static_cast<difference_type>(Extent));
     }
 
     template <std::size_t MyExtent = Extent, std::enable_if_t<MyExtent == dynamic_extent, int> = 0>
     constexpr span(pointer firstElem, pointer lastElem) noexcept
-        : storage_(firstElem, static_cast<std::size_t>(lastElem - firstElem))
+        : storage_(firstElem, gsl::narrow_cast<std::size_t>(lastElem - firstElem))
     {}
 
     template <std::size_t N,