From 47f39334899ef3e743859c5daadafb2997477471 Mon Sep 17 00:00:00 2001
From: rdb <git@rdb.name>
Date: Mon, 19 Mar 2012 09:39:43 +0000
Subject: [PATCH] allow casting bitmasks to their integer type, and make sure
 that bool(bitmask) is False when all bits are off

---
 panda/src/putil/bitMask.I | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/panda/src/putil/bitMask.I b/panda/src/putil/bitMask.I
index 9c7de08321..53bdbe48fd 100644
--- a/panda/src/putil/bitMask.I
+++ b/panda/src/putil/bitMask.I
@@ -821,6 +821,29 @@ operator >>= (int shift) {
   _word >>= shift;
 }
 
+////////////////////////////////////////////////////////////////////
+//     Function: BitMask::operator WType
+//       Access: Published
+//  Description: Used to cast this BitMask back into the
+//               underlying integer type.
+////////////////////////////////////////////////////////////////////
+template<class WType, int nbits>
+INLINE BitMask<WType, nbits>::
+operator WType () const {
+  return _word;
+}
+
+////////////////////////////////////////////////////////////////////
+//     Function: BitMask::operator bool
+//       Access: Published
+//  Description: Will return true, unless all bits are off.
+////////////////////////////////////////////////////////////////////
+template<class WType, int nbits>
+INLINE BitMask<WType, nbits>::
+operator bool () const {
+  return (_word != 0);
+}
+
 ////////////////////////////////////////////////////////////////////
 //     Function: BitMask::get_key
 //       Access: Published