From c2fa384d666aea1b119736f33116ac09e870fda0 Mon Sep 17 00:00:00 2001
From: trav90 <travawine@palemoon.org>
Date: Sat, 6 Oct 2018 17:29:50 -0500
Subject: Add mozilla::Span

---
 mfbt/Casting.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'mfbt/Casting.h')

diff --git a/mfbt/Casting.h b/mfbt/Casting.h
index a7d0fb50d..adf2c9045 100644
--- a/mfbt/Casting.h
+++ b/mfbt/Casting.h
@@ -238,6 +238,19 @@ AssertedCast(const From aFrom)
   return static_cast<To>(aFrom);
 }
 
+/**
+ * Cast a value of integral type |From| to a value of integral type |To|,
+ * release asserting that the cast will be a safe cast per C++ (that is, that
+ * |to| is in the range of values permitted for the type |From|).
+ */
+template<typename To, typename From>
+inline To
+ReleaseAssertedCast(const From aFrom)
+{
+  MOZ_RELEASE_ASSERT((detail::IsInBounds<From, To>(aFrom)));
+  return static_cast<To>(aFrom);
+}
+
 } // namespace mozilla
 
 #endif /* mozilla_Casting_h */
-- 
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