From b569cfc1e9bb3b665fb0d4c4fe1084bfa3feb6ba Mon Sep 17 00:00:00 2001
From: Bryant Mairs <bryant@mai.rs>
Date: Sun, 27 Aug 2017 09:02:02 -0700
Subject: Support casting values in libc_enum!

---
 src/macros.rs | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/macros.rs b/src/macros.rs
index 7a0eb07c..39bc466d 100644
--- a/src/macros.rs
+++ b/src/macros.rs
@@ -379,6 +379,23 @@ macro_rules! libc_enum {
         }
     };
 
+    // Munch an ident and cast it to the given type; covers terminating comma.
+    (@accumulate_entries
+        $prefix:tt,
+        [$($entries:tt)*];
+        $entry:ident as $ty:ty, $($tail:tt)*
+    ) => {
+        libc_enum! {
+            @accumulate_entries
+            $prefix,
+            [
+                $($entries)*
+                $entry = libc::$entry as $ty,
+            ];
+            $($tail)*
+        }
+    };
+
     // (non-pub) Entry rule.
     (
         $(#[$attr:meta])*
-- 
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