ceph/src/boost/libs/hof/test/fail/unpack_uncallable.cpp

   1 /*=============================================================================
   2     Copyright (c) 2017 Paul Fultz II
   3     unpack_uncallable.cpp
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 ==============================================================================*/
   7 #include <boost/hof/unpack.hpp>
   8
   9 struct foo
  10 {};
  11
  12 namespace boost { namespace hof {
  13
  14 template<>
  15 struct unpack_sequence<foo>
  16 {
  17     template<class F, class S>
  18     constexpr static auto apply(F&&, S&& s) BOOST_HOF_RETURNS(s.bar);
  19 };
  20 }
  21
  22 int main() {
  23     boost::hof::unpack(boost::hof::always(1))(foo{});
  24 }