From e7f6c42a793e3736398f19740cc341fed177253a Mon Sep 17 00:00:00 2001
From: Anton Danielsson <anton.danielsson@dirac.se>
Date: Mon, 5 Oct 2015 14:26:31 +0200
Subject: [PATCH] Fixed bug in "ToExponentAndMantissa" when negative exponents
 where created.

Unary minus where applied to an unsigned type.
---
 src/string_util.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/string_util.cc b/src/string_util.cc
index aeb9bc8a..6dc7f5ec 100644
--- a/src/string_util.cc
+++ b/src/string_util.cc
@@ -66,7 +66,7 @@ void ToExponentAndMantissa(double val, double thresh, int precision,
       scaled *= one_k;
       if (scaled >= small_threshold) {
         mantissa_stream << scaled;
-        *exponent = -i - 1;
+        *exponent = -static_cast<int64_t>(i + 1);
         *mantissa = mantissa_stream.str();
         return;
       }