From d95d31684832075fda04c9fc916f8ec875552763 Mon Sep 17 00:00:00 2001
From: Vladimir Prus <vladimir.prus@gmail.com>
Date: Fri, 6 Jul 2018 17:34:12 +0300
Subject: [PATCH] fix msvc 10 error.

---
 src/options_description.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/options_description.cpp b/src/options_description.cpp
index d4fcfc8..dc0eae8 100644
--- a/src/options_description.cpp
+++ b/src/options_description.cpp
@@ -181,8 +181,9 @@ namespace boost { namespace program_options {
     const std::pair<const std::string*, std::size_t>
     option_description::long_names() const
     {
+        // reinterpret_cast is to please msvc 10.
         return (m_long_names.empty())
-            ? std::pair<const std::string*, size_t>( NULL, 0 )
+            ? std::pair<const std::string*, size_t>(reinterpret_cast<const std::string*>(0), 0 )
             : std::pair<const std::string*, size_t>( &(*m_long_names.begin()), m_long_names.size());
     }