From 4845fbb1288c92ce73f84d3c7878b7c81dc09654 Mon Sep 17 00:00:00 2001
From: Chris Dyer <cdyer@cs.cmu.edu>
Date: Fri, 17 Feb 2012 13:01:54 -0500
Subject: boost version checking, check for Eigen, get rid of old digamma stuff

---
 utils/m.h | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'utils')

diff --git a/utils/m.h b/utils/m.h
index b25248c2..5e45efee 100644
--- a/utils/m.h
+++ b/utils/m.h
@@ -3,6 +3,7 @@
 
 #include <cassert>
 #include <cmath>
+#include <boost/math/special_functions/digamma.hpp>
 
 template <typename F>
 struct M {
@@ -81,6 +82,11 @@ struct M {
     }
   }
 
+  // digamma is the first derivative of the log-gamma function
+  static inline F digamma(const F& x) {
+    return boost::math::digamma(x);
+  }
+
 };
 
 typedef M<double> Md;
-- 
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