From 6018d1c4c40149390b7cf6517d28e8b87b25c90c Mon Sep 17 00:00:00 2001
From: Kohei Takahashi <flast@flast.jp>
Date: Tue, 13 Jun 2017 18:37:01 +0900
Subject: [PATCH] Fixed compile error with FreeBSD libc.

FreeBSD libc defines NULL as nullptr in c++11 or later mode; nullptr cannot convert to arithmetic type.

see https://svnweb.freebsd.org/base/head/sys/sys/_null.h?r1=192002&r2=228918
---
 include/boost/archive/iterators/escape.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/boost/archive/iterators/escape.hpp b/include/boost/archive/iterators/escape.hpp
index c8ec903a9..103b31e0f 100644
--- a/include/boost/archive/iterators/escape.hpp
+++ b/include/boost/archive/iterators/escape.hpp
@@ -103,7 +103,7 @@ class escape :
         m_bnext(NULL),
         m_bend(NULL),
         m_full(false),
-        m_current_value(NULL)
+        m_current_value(0)
     {
     }
 };