Squashed 'third_party/boostorg/type_traits/' content from commit 059ed88

Change-Id: I222c604dfa1db194bf53bc6aa1152fb16e83ce06
git-subtree-dir: third_party/boostorg/type_traits
git-subtree-split: 059ed8839da3fecd1e8b62cdc11be006f6346b5e
diff --git a/doc/is_complex.qbk b/doc/is_complex.qbk
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+[/ 
+  Copyright 2007 John Maddock.
+  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).
+]
+
+[section:is_complex is_complex]
+   
+   template <class T>
+   struct is_complex : public __tof {};
+  
+__inherit If `T` is a complex number type then true (of type `std::complex<U>` for
+some type `U`), otherwise false.
+
+__std_ref 26.2.
+
+[all_compilers]
+
+__header ` #include <boost/type_traits/is_complex.hpp>` or ` #include <boost/type_traits.hpp>`
+
+[endsect]
+