Squashed 'third_party/boostorg/mpl/' content from commit 270f33f

Change-Id: I5a6782ce88b854b0fd4d374f7ada8fc18608d79a
git-subtree-dir: third_party/boostorg/mpl
git-subtree-split: 270f33f67998ffaac6afdae25fe06be2ee744d6e
diff --git a/book/chapter1/binary.hpp b/book/chapter1/binary.hpp
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--- /dev/null
+++ b/book/chapter1/binary.hpp
@@ -0,0 +1,18 @@
+//
+// Copyright 2005 David Abrahams and Aleksey Gurtovoy. Distributed
+// under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+#include "boost/mpl/long.hpp"
+#include "boost/mpl/alias.hpp"
+
+template< long n > struct binary
+    : mpl::long_< ( binary< n / 10 >::value << 1 ) + n % 10 >
+{
+};
+
+template<> struct binary<0>
+    : mpl::long_<0>
+{
+};