ceph/src/boost/libs/type_traits/doc/is_polymorphic.qbk

   1 [/
   2   Copyright 2007 John Maddock.
   3   Distributed under the Boost Software License, Version 1.0.
   4   (See accompanying file LICENSE_1_0.txt or copy at
   5   http://www.boost.org/LICENSE_1_0.txt).
   6 ]
   7
   8 [section:is_polymorphic is_polymorphic]
   9    template <class T>
  10    struct is_polymorphic : public __tof {};
  11
  12 __inherit If T is a (possibly cv-qualified) polymorphic type
  13 then inherits from __true_type,
  14 otherwise inherits from __false_type.  Type `T` must be a complete type.
  15
  16 __std_ref 10.3.
  17
  18 __compat The implementation requires some knowledge of the compilers ABI,
  19 it does actually seem to work with the majority of compilers though.
  20
  21 __header ` #include <boost/type_traits/is_polymorphic.hpp>` or ` #include <boost/type_traits.hpp>`
  22
  23 __examples
  24
  25 [: Given: `class poly{ virtual ~poly(); };` ]
  26
  27 [:`is_polymorphic<poly>` inherits from `__true_type`.]
  28
  29 [:`is_polymorphic<poly const>::type` is the type `__true_type`.]
  30
  31 [:`is_polymorphic<poly>::value` is an integral constant
  32 expression that evaluates to /true/.]
  33
  34 [:`is_polymorphic<T>::value_type` is the type `bool`.]
  35
  36 [endsect]
  37