ceph/src/boost/boost/type_erasure/is_empty.hpp

   1 // Boost.TypeErasure library
   2 //
   3 // Copyright 2012 Steven Watanabe
   4 //
   5 // Distributed under the Boost Software License Version 1.0. (See
   6 // accompanying file LICENSE_1_0.txt or copy at
   7 // http://www.boost.org/LICENSE_1_0.txt)
   8 //
   9 // $Id$
  10
  11 #ifndef BOOST_TYPE_ERASURE_IS_EMPTY_HPP_INCLUDED
  12 #define BOOST_TYPE_ERASURE_IS_EMPTY_HPP_INCLUDED
  13
  14 #include <boost/type_erasure/detail/access.hpp>
  15
  16 namespace boost {
  17 namespace type_erasure {
  18
  19 /** Returns true for an empty @ref any. */
  20 template<class T>
  21 bool is_empty(const T& arg) {
  22     return ::boost::type_erasure::detail::access::data(arg).data == 0;
  23 }
  24
  25 }
  26 }
  27
  28 #endif