From 0075e0c37d9c33ed00e4308e6444b61b204327ba Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@gmail.com>
Date: Tue, 26 Oct 2010 15:42:13 -0400
Subject: Add numerical polynomial solver based on Uspensky's algorithm.

---
 libdimension/dimension/geometry.h | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'libdimension/dimension/geometry.h')

diff --git a/libdimension/dimension/geometry.h b/libdimension/dimension/geometry.h
index 87e7ab7..4c4f8b8 100644
--- a/libdimension/dimension/geometry.h
+++ b/libdimension/dimension/geometry.h
@@ -96,6 +96,13 @@ dmnsn_degrees(double radians)
   return radians*45.0/atan(1.0);
 }
 
+DMNSN_INLINE int
+dmnsn_signbit(double n)
+{
+  /* Guarantee a 1 or 0 return, to allow testing two signs for equality */
+  return signbit(n) ? 1 : 0;
+}
+
 /* Shorthand for vector/matrix construction */
 
 DMNSN_INLINE dmnsn_vector
-- 
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