From 1ef99e26628fe0ef0b8fea4fc48d4e309cddd067 Mon Sep 17 00:00:00 2001
From: Alexander Mai <amai@users.sf.net>
Date: Sun, 13 Apr 2014 19:20:44 +0200
Subject: [PATCH] Try to avoid compiler warning for unary minus operator inside
 MathLib::toLongNumber<biguint>()

---
 lib/mathlib.h | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/mathlib.h b/lib/mathlib.h
index 233d601ba..bd4aacbd5 100644
--- a/lib/mathlib.h
+++ b/lib/mathlib.h
@@ -24,6 +24,7 @@
 #include <cstdlib>
 #include <string>
 #include <sstream>
+#include <type_traits>
 #include "config.h"
 
 /// @addtogroup Core
@@ -69,8 +70,10 @@ public:
                 if (str[i] == '1')
                     ret |= 1;
             }
-            if (str[0] == '-')
-                ret = -ret;
+            if (std::is_signed<T>()) {
+                if (str[0] == '-')
+                    ret = -ret;
+            }
             return ret;
         }