ceph/src/boost/libs/type_traits/doc/has_virtual_destructor.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:has_virtual_destructor has_virtual_destructor]
   9    template <class T>
  10    struct has_virtual_destructor : public __tof {};
  11
  12 __inherit If T is a (possibly cv-qualified) type with a virtual destructor
  13 then inherits from __true_type, otherwise inherits from __false_type.
  14
  15 __compat There is currently no
  16 way to portably implement this trait: the default version
  17 always inherits from __false_type, and has to be explicitly specialized for
  18 types with virtual destructors unless the compiler used has compiler __intrinsics
  19 that enable the trait to do the right thing:
  20 Currently (June 2015) compilers more recent than Visual C++ 8, GCC-4.3, Greenhills 6.0,
  21 Intel-11.0, plus Codegear and Clang have the necessary compiler __intrinsics to ensure that this
  22 trait "just works".  You may also test to see if the necessary __intrinsics are available
  23 by checking to see if the macro `BOOST_HAS_VIRTUAL_DESTRUCTOR` is defined.
  24
  25
  26 __std_ref 12.4.
  27
  28 __header ` #include <boost/type_traits/has_virtual_destructor.hpp>` or ` #include <boost/type_traits.hpp>`
  29
  30 [endsect]
  31