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

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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_arithmetic is_arithmetic]
+   template <class T>
+   struct is_arithmetic : public __tof {};
+  
+__inherit If T is a (possibly cv-qualified) arithmetic type then inherits from 
+__true_type, otherwise inherits from __false_type.  Arithmetic types include 
+integral and floating point types (see also __is_integral and __is_floating_point).
+
+__std_ref 3.9.1p8.
+
+__header ` #include <boost/type_traits/is_arithmetic.hpp>` or ` #include <boost/type_traits.hpp>`
+
+__examples
+
+[:`is_arithmetic<int>` inherits from `__true_type`.]
+
+[:`is_arithmetic<char>::type` is the type `__true_type`.]
+
+[:`is_arithmetic<double>::value` is an integral constant 
+expression that evaluates to /true/.]
+
+[:`is_arithmetic<T>::value_type` is the type `bool`.]
+
+[endsect]
+