update span specialization of at, change some tests back to int i with narrowing for the comparisons.

2020-02-05 17:12:31 -08:00
parent 3b9d15f49f
commit a49ff1b8df
2 changed files with 11 additions and 10 deletions
@@ -806,7 +806,8 @@ template <class ElementType, std::size_t Extent>
 constexpr ElementType& at(span<ElementType, Extent> s, index i)
 {
    // No bounds checking here because it is done in span::operator[] called below
-    return s[i];
+    Ensures(i >= 0);
+    return s[narrow_cast<std::size_t>(i)];
 }

 // [span.obs] Free observer functions