From a2f3cf6f38d05d0f1881dd760e09b30eaa075ff0 Mon Sep 17 00:00:00 2001
From: Tobias Klauser <tklauser@distanz.ch>
Date: Wed, 17 Feb 2016 15:19:36 +0100
Subject: [PATCH] Suppress MSVC warning C4800 caused by
 static_cast<bool>(unsigned)

The static_cast<bool> of an unsigned causes the following warning with
MSVC:

  warning C4800: "'int' : forcing value to bool 'true' or 'false' (performance warning)

Suppress the warning for the cast in question as is done in other places
of Boost.
---
 include/boost/crc.hpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/boost/crc.hpp b/include/boost/crc.hpp
index 87f6ebf..80a8db5 100644
--- a/include/boost/crc.hpp
+++ b/include/boost/crc.hpp
@@ -1774,7 +1774,14 @@ crc_basic<Bits>::process_bits
     unsigned char const  high_bit_mask = 1u << ( CHAR_BIT - 1u );
     for ( std::size_t i = bit_length ; i > 0u ; --i, bits <<= 1u )
     {
+#ifdef BOOST_MSVC
+#pragma warning(push)
+#pragma warning(disable:4800)
+#endif
         process_bit( static_cast<bool>(bits & high_bit_mask) );
+#ifdef BOOST_MSVC
+#pragma warning(pop)
+#endif
     }
 }