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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_base_of is_base_of]
+
+ template <class Base, class Derived>
+ struct is_base_of : public __tof {};
+
+__inherit If Base is base class of type Derived or if both types are the same
+class type then inherits from __true_type,
+otherwise inherits from __false_type.
+
+This template will detect non-public base classes, and ambiguous base classes.
+It also detects indirect base classes - which is to say __is_base_of<B, D> inherits
+from __true_type if B is located anywhere in the inheritance tree of D.
+
+Note that `is_base_of<X,X>` will inherit from __true_type if X is a class type.
+This is a change in behaviour
+from Boost-1.39.0 in order to track the emerging C++0x standard.
+
+Types `Base` and `Derived` must not be incomplete types.
+
+__std_ref 10.
+
+__header ` #include <boost/type_traits/is_base_of.hpp>` or ` #include <boost/type_traits.hpp>`
+
+[all_compilers]
+
+__examples
+
+[:Given: ` class Base{}; class Derived : public Base{};` ]
+
+[:`is_base_of<Base, Derived>` inherits from `__true_type`.]
+
+[:`is_base_of<Base, Derived>::type` is the type `__true_type`.]
+
+[:`is_base_of<Base, Derived>::value` is an integral constant
+expression that evaluates to /true/.]
+
+[:`is_base_of<Base, Base>::value` is an integral constant
+expression that evaluates to /true/: a class is regarded as it's own base.]
+
+[:`is_base_of<T, T>::value_type` is the type `bool`.]
+
+[endsect]
+
+
+