From 88873f7965d04cc2bea56f2b957e3b506442c582 Mon Sep 17 00:00:00 2001
From: Zahary Karadjov <zahary@gmail.com>
Date: Mon, 30 Dec 2013 14:25:05 +0200
Subject: [PATCH] add incl/excl for sets accepting accepting other sets

---
 lib/system.nim | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/system.nim b/lib/system.nim
index 978fae1a6e..241b0bd034 100644
--- a/lib/system.nim
+++ b/lib/system.nim
@@ -422,10 +422,18 @@ proc incl*[T](x: var set[T], y: T) {.magic: "Incl", noSideEffect.}
   ## includes element ``y`` to the set ``x``. This is the same as
   ## ``x = x + {y}``, but it might be more efficient.
 
+template incl*[T](s: var set[T], flags: set[T]) =
+  ## includes the set of flags to the set ``x``.
+  s = s + flags
+
 proc excl*[T](x: var set[T], y: T) {.magic: "Excl", noSideEffect.}
   ## excludes element ``y`` to the set ``x``. This is the same as
   ## ``x = x - {y}``, but it might be more efficient.
 
+template excl*[T](s: var set[T], flags: set[T]) =
+  ## excludes the set of flags to ``x``.
+  s = s - flags
+
 proc card*[T](x: set[T]): int {.magic: "Card", noSideEffect.}
   ## returns the cardinality of the set ``x``, i.e. the number of elements
   ## in the set.